CVE-2023-43497: Malicious File Upload
First published: Wed Sep 20 2023(Updated: )
In Jenkins 2.423 and earlier, LTS 2.414.1 and earlier, uploaded files processed via the Stapler web framework and the Jenkins API `MultipartFormDataParser` create temporary files in the system temporary directory with the default permissions for newly created files. If these permissions are overly permissive, attackers with access to the system temporary directory may be able to read and write the file before it is used. This vulnerability only affects operating systems using a shared temporary directory for all users (typically Linux). Additionally, the default permissions for newly created files generally only allow attackers to read the temporary file, but not write to it. Jenkins 2.424, LTS 2.414.2 creates the temporary files in a subdirectory with more restrictive permissions. As a workaround, you can change your default temporary-file directory using the Java system property `java.io.tmpdir`, if you’re concerned about this issue but unable to immediately update Jenkins.
Credit: jenkinsci-cert@googlegroups.com jenkinsci-cert@googlegroups.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/org.jenkins-ci.main:jenkins-core | >=2.415<2.424 | 2.424 |
| maven/org.jenkins-ci.main:jenkins-core | >=2.50<2.414.2 | 2.414.2 |
| Jenkins Jenkins | <2.414.2 | |
| Jenkins Jenkins | <2.424 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2023-43497
- https://www.jenkins.io/security/advisory/2023-09-20/#SECURITY-3073
- http://www.openwall.com/lists/oss-security/2023/09/20/5
- https://github.com/advisories/GHSA-qv64-w99c-qcr9 (Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/266555
- https://www.ibm.com/support/pages/node/7096365 (Advisory)
Frequently Asked Questions
What is CVE-2023-43497?
CVE-2023-43497 is a vulnerability in Jenkins 2.423 and earlier LTS 2.414.1 and earlier, where uploaded files processed via the Stapler web framework and the Jenkins API MultipartFormDataParser create temporary files in the system temporary directory with default permissions.
How severe is CVE-2023-43497?
CVE-2023-43497 has a severity rating of 8.1 (high).
Which software versions are affected by CVE-2023-43497?
Jenkins versions up to and including 2.424 for the Jenkins package, and versions up to and including 2.414.2 for the Jenkins LTS package are affected by CVE-2023-43497.
How can I fix CVE-2023-43497?
To fix CVE-2023-43497, you should update your Jenkins installation to version 2.424 for the Jenkins package or version 2.414.2 for the Jenkins LTS package.
Where can I find more information about CVE-2023-43497?
You can find more information about CVE-2023-43497 in the following references: [1] http://www.openwall.com/lists/oss-security/2023/09/20/5 [2] https://www.jenkins.io/security/advisory/2023-09-20/#SECURITY-3073 [3] https://nvd.nist.gov/vuln/detail/CVE-2023-43497
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