CVE-2023-27903

Description

When triggering a build from the Jenkins CLI, Jenkins creates a temporary file on the controller if a file parameter is provided through the CLI’s standard input. Jenkins 2.393 and earlier, LTS 2.375.3 and earlier, and , and LTS prior to 2.387.1 creates this temporary file in the default temporary directory with the default permissions for newly created files. If these permissions are overly permissive, they may allow attackers with access to the Jenkins controller file system to read and write the file before it is used in the build. 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 allows attackers to read the temporary file. Jenkins 2.394, LTS 2.375.4, and LTS 2.387.1 creates the temporary file with more restrictive permissions. As a workaround, you can set a different path as your default temporary directory using the Java system property java.io.tmpdir, if you’re concerned about this issue but unable to immediately update Jenkins.

How to fix CVE-2023-27903

To remediate CVE-2023-27903, upgrade the affected package to a fixed version below.

• —upgrade to 2.394.0 or later
• —upgrade to 2.387.1 or later

Is CVE-2023-27903 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 2.394.0
• >= 2.376, < 2.387.1

CVSS scores

References (4)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2023-27903
• WEBgithub.com/CVEProject/cvelist/blob/master/2023/27xxx/CVE-2023-27903.json
• WEBgithub.com/jenkinsci/jenkins/commit/554587b06db553ce35fa362d7a0b0aef33a57afb
• WEBwww.jenkins.io/security/advisory/2023-03-08/#SECURITY-3058