Improper Input Validation The advisory has been revoked - it doesn't affect any version of package apache-log4j2 (opens in a new tab)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-APACHELOG4J2-3252124
- published20 Dec 2021
- disclosed18 Dec 2021
Introduced: 18 Dec 2021
CVE-2021-45105 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream apache-log4j2 package and not the apache-log4j2 package as distributed by Ubuntu.
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-45105
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbd
- https://security.netapp.com/advisory/ntap-20211218-0001/
- https://www.debian.org/security/2021/dsa-5024
- https://logging.apache.org/log4j/2.x/security.html
- https://www.zerodayinitiative.com/advisories/ZDI-21-1541/
- http://www.openwall.com/lists/oss-security/2021/12/19/1
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdf
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032
- https://www.kb.cert.org/vuls/id/930724
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://github.com/cckuailong/Log4j_dos_CVE-2021-45105