OverviewOn March 2, Exim announced via its mailing list that it had discovered a vulnerability in all versions of its mail transport agent. Exim is the default MTA on cPanel servers. The latest version patches the vulnerability, and the latest cPanel update resolves the issue.
ImpactExim says that all installations of its MTA were vulnerable to a condition in which an attacker with any level of privileges on the server could gain root privileges. The versions of cPanel & WHM listed below are protected against the attack on Exim. Any version prior to the current versions listed below are vulnerable:
- 55.9999.106 (EDGE tier only)
Is Exim Vulnerable on Your Server?If your cPanel server has automatic updates enabled, then the patch will already have been applied. You can confirm that your server is protected simply by logging into WHM and checking the version listed at the top of the screen, as shown in the image below:
Note: the “build” listed after the version represents the final digits in the release version. In the example above, WHM 54.0 (build 18) indicates that the version is 54.0.18.