Security Advisories: GSA_kwCzR0hTQS03cmpyLTNxNTUtdnYzM80bQA

Incomplete fix for Apache Log4j vulnerability

Impact

The fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allow attackers with control over Thread Context Map (MDC) input data when the logging configuration uses a non-default Pattern Layout with either a Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern (%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern resulting in a remote code execution (RCE) attack.

Affected packages

Only the org.apache.logging.log4j:log4j-core package is directly affected by this vulnerability. The org.apache.logging.log4j:log4j-api should be kept at the same version as the org.apache.logging.log4j:log4j-core package to ensure compatability if in use.

Mitigation

Log4j 2.16.0 fixes this issue by removing support for message lookup patterns and disabling JNDI functionality by default. This issue can be mitigated in prior releases (< 2.16.0) by removing the JndiLookup class from the classpath (example: zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class).

Log4j 2.15.0 restricts JNDI LDAP lookups to localhost by default. Note that previous mitigations involving configuration such as to set the system property log4j2.formatMsgNoLookups to true do NOT mitigate this specific vulnerability.

Permalink: https://github.com/advisories/GHSA-7rjr-3q55-vv33
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS03cmpyLTNxNTUtdnYzM80bQA
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 2 years ago
Updated: 6 months ago

CVSS Score: 9.1
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Identifiers: GHSA-7rjr-3q55-vv33, CVE-2021-45046
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-45046
• https://github.com/advisories/GHSA-jfh8-c2jp-5v3q
• https://logging.apache.org/log4j/2.x/security.html
• https://www.openwall.com/lists/oss-security/2021/12/14/4
• https://www.cve.org/CVERecord?id=CVE-2021-44228
• http://www.openwall.com/lists/oss-security/2021/12/14/4
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
• https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00646.html
• http://www.openwall.com/lists/oss-security/2021/12/15/3
• https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdf
• https://www.kb.cert.org/vuls/id/930724
• https://www.debian.org/security/2021/dsa-5022
• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
• https://www.oracle.com/security-alerts/alert-cve-2021-44228.html
• http://www.openwall.com/lists/oss-security/2021/12/18/1
• https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
• https://lists.fedoraproject.org/archives/list/[email protected]/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/
• https://www.oracle.com/security-alerts/cpujan2022.html
• https://www.oracle.com/security-alerts/cpuapr2022.html
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJ/
• https://security.gentoo.org/glsa/202310-16
• https://github.com/advisories/GHSA-7rjr-3q55-vv33

Blast Radius: 44.8

Affected Packages