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githubGitHub Advisory DatabaseGHSA-7RJR-3Q55-VV33
HistoryDec 14, 2021 - 6:01 p.m.

Incomplete fix for Apache Log4j vulnerability

2021-12-1418:01:28
CWE-502
CWE-917
GitHub Advisory Database
github.com
234

9.3 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

10 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

0.976 High

EPSS

Percentile

100.0%

JSON

Impact

The fix to address CVE-2021-44228 in Apache Log4j 2.15.0 was incomplete in certain non-default configurations. This could allow 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 a remote code execution (RCE) attack.

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.

Mitigation

Log4j 2.16.0 fixes this issue by removing support for message lookup patterns and disabling JNDI functionality by default. This issue can be mitigated in prior releases (< 2.16.0) by removing the JndiLookup class from the classpath (example: zip -q -d log4j-core-*.jar org/apache/logging/log4j/core/lookup/JndiLookup.class).

Log4j 2.15.0 restricts JNDI LDAP lookups to localhost by default. Note that previous mitigations involving configuration such as to set the system property log4j2.formatMsgNoLookups to true do NOT mitigate this specific vulnerability.

Affected configurations

Vulners
Node
org.apache.logging.log4j\log4jMatchcore
OR
org.apache.logging.log4j\log4jMatchcore

References

Related

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thn 3
nvd 1
redhatcve 1
cve 1
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avleonov 1
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9.3 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

10 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

0.976 High

EPSS

Percentile

100.0%

JSON
Related for GHSA-7RJR-3Q55-VV33
nuclei1fortinet1talosblog1ibm81amazon5nessus18checkpoint_advisories1openvas25redhat4vmware10githubexploit8securelist1mageia1cisa_kev1kitploit2impervablog1rapid7blog1f51mmpc1osv4malwarebytes1huawei1freebsd1github1threatpost2mssecure1ubuntu1debiancve1cvelist2typo31intel1attackerkb3ubuntucve1suse2debian1prion1thn3nvd1redhatcve1cve1veracode1fedora1avleonov1ics1