CVE-2021-4104 Security Details

CVE ID

CVE-2021-4104

CWE

CWE-502

CVE 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.

Published

Dec 14, 2021

CVSS Score & Severity

7.5High

CVSS Vector

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

EPSS Score

72.202%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/apache/log4j/net/JMSAppender.activateOptions()V

JVM

org/apache/log4j/net/JMSAppender.lookup(Ljavax/naming/Context;Ljava/lang/String;)Ljava/lang/Object;

JVMVulnerable params: 0, 1

Affected Ecosystems

affected

Source

National Vulnerability Database

References

GitHub · PR #608PROJECT

Red Hat · Bugzilla #2031667THIRD_PARTY