Not rated
Exploited
· ransomware
CVE-2021-45046 Apache Log4j2 Deserialization of Untrusted Data Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
Apply updates per vendor instructions.
Ransomware campaigns
Known to be used
Weakness
CWE-917
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Apache Log4j 2.16 | earliest → < 2.16.0 | 2.16.0 |
References
- psirt.global.sonicwall.com psirt.global.sonicwall.com
- www.oracle.com www.oracle.com
- www.cve.org www.cve.org
- [oss-security] 20211214 CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack www.openwall.com
- logging.apache.org logging.apache.org
- VU#930724 www.kb.cert.org
- cert-portal.siemens.com cert-portal.siemens.com
- www.intel.com www.intel.com
- 20211210 Vulnerabilities in Apache Log4j Library Affecting Cisco Products: December 2021 tools.cisco.com
- [oss-security] 20211215 Re: CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack www.openwall.com
- cert-portal.siemens.com cert-portal.siemens.com
- DSA-5022 www.debian.org
- [oss-security] 20211218 Re: CVE-2021-45046: Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack www.openwall.com
- cert-portal.siemens.com cert-portal.siemens.com
- cert-portal.siemens.com cert-portal.siemens.com
- FEDORA-2021-5c9d12a93e lists.fedoraproject.org
- FEDORA-2021-abbe24e41c lists.fedoraproject.org
- www.oracle.com www.oracle.com
- www.oracle.com www.oracle.com
- www.oracle.com www.oracle.com
- security.gentoo.org security.gentoo.org
Timeline
- Published
- Added to the KEV catalogue
- Last modified