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GHSA-7rjr-3q55-vv33

Incomplete fix for Apache Log4j vulnerability

Source: GitHub Advisory Database (reviewed) Critical CVE-2021-45046

Packages

EcosystemPackageAffectedFixed in
Maven org.apache.logging.log4j:log4j-core >= 2.13.0, < 2.16.0 2.16.0
Maven org.apache.logging.log4j:log4j-core >= 2.4.0, < 2.12.2 2.12.2
Maven org.ops4j.pax.logging:pax-logging-log4j2 >= 1.8.0, < 1.9.2 1.9.2
Maven org.ops4j.pax.logging:pax-logging-log4j2 >= 1.10.0, < 1.10.8 1.10.8
Maven org.ops4j.pax.logging:pax-logging-log4j2 >= 1.11.0, < 1.11.11 1.11.11
Maven org.ops4j.pax.logging:pax-logging-log4j2 >= 2.0.0, < 2.0.12 2.0.12
Maven org.apache.logging.log4j:log4j-core < 2.3.1 2.3.1

Details

As written in the advisory (Markdown source, shown as plain text).

# Impact The fix to address [CVE-2021-44228](https://nvd.nist.gov/vuln/detail/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.

References

External links from the advisory. They lead to third-party sites.