CVE-2019-11500: vulnerability in Dovecot and Pigeonhole

Situation

CVE-2019-11500 vulnerability is found in Dovecot and Pigeonhole.

All Dovecot versions prior to 2.3.7.2 and 2.2.36.4 are affected.

Impact

This vulnerability allows for out-of-bounds writes to objects stored on the heap up to 8096 bytes in pre-login phase, and 65536 bytes post-login phase, allowing a sufficiently skilled attacker to perform complicated attacks that can lead to leaking private information or remote code execution. Abuse of this bug is very difficult to observe, as it does not necessarily cause a crash. Attempts to abuse this bug are not directly evident from logs.

Call to Action

Plesk Team is in progress of releasing security update.
Consider subscribing to this article to be notified when the security update will be available.

Approximate ETA for vulnerabilities fix is:

• Plesk 17.8 – already available in Update 67, released on the 5th of September

• Plesk 17.5 – 9th of September

• Plesk 17.0 – 16th of September 

As workaround temporary switch from Dovecot to Courier:  Log in to Plesk > Tools&Settings > Updates and Upgrades > Add/Remove components: