LDAP Deserialization Flaw in Jenkins Plugin

Executive Summary

This vulnerability exists in the Jenkins LDAP Plugin version 807.v7d7de30930cf and earlier. It involves the plugin deserializing data from LDAP referrals without performing validation on that data.

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Impact Analysis

Deserializing data from LDAP referrals without validation can lead to security risks such as remote code execution or other malicious actions if an attacker can control the LDAP referral data.

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Compliance Impact

The provided information does not specify how this vulnerability affects compliance with common standards and regulations such as GDPR or HIPAA.

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Detection Guidance

This vulnerability involves the Jenkins LDAP Plugin deserializing data from LDAP referrals without validation, which can lead to Remote Code Execution if exploited.

To detect this vulnerability on your system, you should first identify if you are running Jenkins with the LDAP Plugin version 807.v7d7de30930cf or earlier.

You can check the installed plugin version by running the following command on the Jenkins server:

• curl -sSL http://<jenkins-server>/pluginManager/api/json?depth=1 | jq '.plugins[] | select(.shortName=="ldap") | .version'

Additionally, monitoring network traffic for suspicious LDAP referrals or unexpected RMI URLs could help detect exploitation attempts.

However, no specific detection commands for exploitation attempts are provided in the available resources.

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Mitigation Strategies

The immediate mitigation step is to upgrade the Jenkins LDAP Plugin to version 807.809.vd3a_4e5e4ec98 or later.

This fixed version disables the automatic following of LDAP referrals by default, preventing the deserialization of unvalidated data.

Additionally, ensure that your LDAP server is trusted and secure to prevent attackers from manipulating LDAP referrals.

If upgrading immediately is not possible, consider restricting network access to the LDAP server and monitoring for unusual LDAP referral activity.

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