CVE-2021-4104
apache-log4j1.2 - security update
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.
How to fix CVE-2021-4104
To remediate CVE-2021-4104, upgrade the affected package to a fixed version below.
- —upgrade to 1.2.17-10+deb11u1 or later
- —upgrade to 1.2.17-7+deb9u2 or later
- —no fix listed
- —no fix listed
Is CVE-2021-4104 being exploited?
Likely — EPSS is 72.2%, placing CVE-2021-4104 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (4)
- from 0, < 1.2.17-10+deb11u1
- from 0, < 1.2.17-7+deb9u2
- >= 1.2.0, <= 1.2.17
- from 0, <= 2.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |