CVE-2021-4104
Publication date 14 December 2021
Last updated 24 July 2024
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| apache-log4j1.2 | 24.10 oracular |
Vulnerable
|
| 24.04 LTS noble |
Vulnerable
|
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Fixed 1.2.17-9ubuntu0.1
|
|
| 18.04 LTS bionic |
Fixed 1.2.17-8+deb10u1ubuntu0.1
|
|
| 16.04 LTS xenial |
Fixed 1.2.17-7ubuntu1+esm1
|
|
| 14.04 LTS trusty |
Fixed 1.2.17-4ubuntu3+esm1
|
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mdeslaur
This issue is similar to CVE-2021-44228, but for log2j < 2.0 and is only vulnerable if configured to use JMSAppender. For an environment to be vulnerable, an attacker would need write access to the log4j.properties configuration file to specifically enable the JMS Appender and configure it with a JNDI lookup to a third party server. If an attacker has write access to the log4j.properties configuration file, there are also other configuration options that can be used to perform code execution attacks. We therefore recommend configuration files be set with appropriate permissions to only permit being modified by trusted individuals.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | Low |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-5223-1
- Apache Log4j 1.2 vulnerability
- 12 January 2022
- USN-5223-2
- Apache Log4j 1.2 vulnerability
- 8 February 2022