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How the CVE Works:
The Jenkins ByteGuard Build Actions Plugin (v1.0 and earlier) contains a vulnerability where API tokens, used for authentication with external services like ByteGuard, are handled insecurely. Instead of being stored encrypted or in a credentials store, the plugin directly embeds these sensitive tokens in the plaintext `config.xml` file of a Jenkins job. Any user with Item/Extended Read permission can view the job’s configuration page via the web UI, where the token is displayed in cleartext without being masked by password fields. Furthermore, an attacker with file system access to the Jenkins controller can directly read the `config.xml` file from the disk, exfiltrating the token and allowing unauthorized access to the integrated external API.
DailyCVE Form:
Platform: Jenkins
Version: <= 1.0
Vulnerability: Information Disclosure
Severity: Moderate
date: 2024-10-29
Prediction: 2024-12-15
What Undercode Say:
`grep -r “byteguard” $JENKINS_HOME/jobs//config.xml`
`cat $JENKINS_HOME/jobs/MyJob/config.xml | grep -A 5 -B 5 “apiToken”`
How Exploit:
- User with ‘Item/Read’ permission navigates to a job’s configuration page.
- Observes the unmasked API token in the plugin’s configuration section.
- Uses the captured token to make authenticated requests to the ByteGuard API.
Protection from this CVE:
Uninstall the plugin.
Manually remove tokens from `config.xml` files.
Restrict Item/Extended Read permissions.
Await a patched plugin version.
Impact:
Unauthorized API access, potential compromise of the integrated ByteGuard service, and data manipulation.
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Sources:
Reported By: github.com
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