by Kastro
Paper/Archive/CVE-2021-45046

CVE-2021-45046

Apache Software Foundation Apache Log4j — Apache Log4j2 Thread Context Message Pattern and Context Lookup Pattern vulnerable to a denial of service attack

KEV · due 22 Mayransomware useEPSS 100%public exploitSSVC actCVSS 9.0
critical.is priorityof 100
97
CVSS 9.0 (ADP)9.0 / 10 × 3027.0In CISA KEV+3030.0EPSS percentile 100.01.000 × 2020.0Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Apache Log4jApache Log4j2 – < 2.16.02.16.0CNA

Scores by source

CISA ADP9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: active · Automatable: no · Technical impact: total

References

refpsirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0032reforacle.com/security-alerts/alert-cve-2021-44228.htmlrefcve.org/CVERecord?id=CVE-2021-44228refopenwall.com/lists/oss-security/2021/12/14/4reflogging.apache.org/log4j/2.x/security.htmlwriteupkb.cert.org/vuls/id/930724refcert-portal.siemens.com/productcert/pdf/ssa-661247.pdfrefintel.com/content/www/us/en/security-center/advisory/intel-sa-00646.htmladvisorytools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-log4j-qRuKNEbdrefopenwall.com/lists/oss-security/2021/12/15/3refcert-portal.siemens.com/productcert/pdf/ssa-714170.pdfadvisorydebian.org/security/2021/dsa-5022refopenwall.com/lists/oss-security/2021/12/18/1refcert-portal.siemens.com/productcert/pdf/ssa-397453.pdfrefcert-portal.siemens.com/productcert/pdf/ssa-479842.pdfadvisorylists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EOKPQGV24RRBBI4TBZUDQMM4MEH7MXCYadvisorylists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SIG7FZULMNK2XF6FZRU4VWYDQXNMUGAJreforacle.com/security-alerts/cpujan2022.htmlreforacle.com/security-alerts/cpuapr2022.htmlreforacle.com/security-alerts/cpujul2022.htmlrefsecurity.gentoo.org/glsa/202310-16refcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-45046kevcisa.gov/known-exploited-vulnerabilities-catalog