Apache Log4j2 vulnerable to Improper Input Validation and Uncontrolled Recursion
Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3) 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 and 2.12.3. # 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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-45105US | medium5.9 | Exploit | ||
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 wit… | ||||
references
External citations — patches, advisories, analysis.
- http://www.openwall.com/lists/oss-security/2021/12/19/1WEB
- https://cert-portal.siemens.com/productcert/pdf/ssa-479842.pdfWEB
- https://cert-portal.siemens.com/productcert/pdf/ssa-501673.pdfWEB
- https://lists.debian.org/debian-lts-announce/2021/12/msg00017.htmlWEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCYWEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJWEB
- https://logging.apache.org/log4j/2.x/security.htmlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2021-45105ADVISORY
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