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JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data

High severity GitHub Reviewed Published Dec 14, 2021 to the GitHub Advisory Database • Updated Dec 22, 2023

Package

maven log4j:log4j (Maven)

Affected versions

>= 1.2.0, <= 1.2.17

Patched versions

None
maven org.zenframework.z8.dependencies.commons:log4j-1.2.17 (Maven)
<= 2.0
None

Description

JMSAppender in Log4j 1.2 is vulnerable to deserialization of untrusted data when the attacker has write access to the Log4j configuration. The attacker can provide TopicBindingName and TopicConnectionFactoryBindingName configurations causing JMSAppender to perform JNDI requests that result in remote code execution in a similar fashion to CVE-2021-44228. Note this issue only affects Log4j 1.2 when specifically configured to use JMSAppender, which is not the default. Apache Log4j 1.2 reached end of life in August 2015. Users should upgrade to Log4j 2 as it addresses numerous other issues from the previous versions.

References

Published by the National Vulnerability Database Dec 14, 2021
Reviewed Dec 14, 2021
Published to the GitHub Advisory Database Dec 14, 2021
Last updated Dec 22, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

15.908%
(96th percentile)

Weaknesses

CVE ID

CVE-2021-4104

GHSA ID

GHSA-fp5r-v3w9-4333

Source code

Credits

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