Headline
CVE-2022-33915: ALAS-2022-1601
Versions of the Amazon AWS Apache Log4j hotpatch package before log4j-cve-2021-44228-hotpatch-1.3.5 are affected by a race condition that could lead to a local privilege escalation. This Hotpatch package is not a replacement for updating to a log4j version that mitigates CVE-2021-44228 or CVE-2021-45046; it provides a temporary mitigation to CVE-2021-44228 by hotpatching the local Java virtual machines. To do so, it iterates through all running Java processes, performs several checks, and executes the Java virtual machine with the same permissions and capabilities as the running process to load the hotpatch. A local user could cause the hotpatch script to execute a binary with elevated privileges by running a custom java process that performs exec() of an SUID binary after the hotpatch has observed the process path and before it has observed its effective user ID.
Amazon Linux AMI Security Advisory: ALAS-2022-1601
Advisory Release Date: 2022-06-13 16:56 Pacific
Advisory Updated Date: 2022-06-15 18:44 Pacific
Severity: Important
References:
Issue Overview:
Versions of the Apache Log4j hotpatch package before log4j-cve-2021-44228-hotpatch-1.3-5 are affected by a race condition that could lead to a local privilege escalation.
The Apache Log4j Hotpatch is not a replacement for updating to a log4j version that mitigates CVE-2021-44228 or CVE-2021-45046, it provides a temporary mitigation to CVE-2021-44228 by hotpatching local Java virtual machines. To do so, the hotpatch script iterates through all running Java processes, performs several checks, and executes the Java virtual machine with the same permissions and capabilities as the running process to load the hotpatch.
A local user could cause the hotpatch script to execute a binary with elevated privileges by running a custom “java” process which performs exec() of a set user ID binary after the hotpatch has observed the process path and before it has observed its effective user ID.
To leverage this issue a user must already have local access to the target system with permissions to run custom programs.
Affected Packages:
log4j-cve-2021-44228-hotpatch
Issue Correction:
Run yum update log4j-cve-2021-44228-hotpatch to update your system.
New Packages:
noarch:
log4j-cve-2021-44228-hotpatch-1.3-5.amzn1.noarch
src:
log4j-cve-2021-44228-hotpatch-1.3-5.amzn1.src
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