CVE-2024-23904: 
Java vulnerability analysis and mitigation

Log Command Plugin 1.0.2 and earlier contains a high-severity vulnerability (CVE-2024-23904) that affects its command parser functionality. The vulnerability was disclosed on January 24, 2024, and impacts the Jenkins automation server ecosystem. The plugin fails to disable a feature that replaces an '@' character followed by a file path with the file's contents, allowing unauthenticated attackers to read content from arbitrary files on the Jenkins controller file system (Jenkins Advisory, NVD).

The vulnerability exists in the args4j library implementation used by the Log Command Plugin for parsing command arguments and options on the Jenkins controller when processing commands received via instant messaging platforms like IRC or Jabber. The expandAtFiles feature is enabled by default, allowing the replacement of '@' character followed by a file path with the file's contents. The vulnerability has a CVSS v3.1 Base Score of 7.5 (HIGH) with vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (NVD).

The vulnerability allows unauthenticated attackers to read the first line of arbitrary files on the Jenkins controller file system using the default character encoding of the Jenkins controller process. If attackers can access Jenkins (even lacking Overall/Read permission), the severity becomes critical. The impact is particularly concerning as it affects the confidentiality of the system (Jenkins Advisory).

As of the publication of the advisory, there is no fix available for this vulnerability in the Log Command Plugin. Users should assess their risk and consider disabling the plugin if possible. The vulnerability is present in Log Command Plugin version 1.0.2 and earlier (Jenkins Advisory).