CVE-2021-45046

Summary

It was found that the fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allows 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 an information leak and remote code execution in some environments and local code execution in all environments. Log4j 2.16.0 (Java 8) and 2.12.2 (Java 7) fix this issue by removing support for message lookup patterns and disabling JNDI functionality by default.

Impact & exploitability

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

Affected products we track (1)

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Additional information

• NVD record
• http://www.openwall.com/lists/oss-security/2021/12/14/4Advisory
• http://www.openwall.com/lists/oss-security/2021/12/15/3Advisory
• http://www.openwall.com/lists/oss-security/2021/12/18/1Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-397453.pdfAdvisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfAdvisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-661247.pdfAdvisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-714170.pdfAdvisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCY/