CVE-2021-45046
apache-log4j2 - security update
Description
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.
How to fix CVE-2021-45046
To remediate CVE-2021-45046, upgrade the affected package to a fixed version below.
- —upgrade to 2.16.0-1~deb11u1 or later
- —upgrade to 2.16.0-1~deb10u1 or later
- —upgrade to 2.16.0 or later
- —upgrade to 1.9.2 or later
Is CVE-2021-45046 being exploited?
Yes — CVE-2021-45046 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.
Affected packages (4)
- from 0, < 2.16.0-1~deb11u1
- from 0, < 2.16.0-1~deb10u1
- >= 2.13.0, < 2.16.0
- >= 1.8.0, < 1.9.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H |