Ubuntu Security Notice 4110-4 - USN-4110-1 fixed a vulnerability in Dovecot. The update introduced a regression causing a wrong check. This update fixes the problem for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM. Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly handled certain data. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. Various other issues were also addressed.
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Ubuntu Security Notice USN-4110-4
August 28, 2019
dovecot regression
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM
Summary:
USN-4110-1 introduced a regression in Dovecot.
Software Description:
- dovecot: IMAP and POP3 email server
Details:
USN-4110-1 fixed a vulnerability in Dovecot. The update introduced
a regression causing a wrong check. This update fixes the problem for
Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
We apologize for the inconvenience.
Original advisory details:
Nick Roessler and Rafi Rubin discovered that Dovecot incorrectly
handled certain data. An attacker could possibly use this issue
to cause a denial of service or execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
dovecot-core 1:2.2.9-1ubuntu2.6+esm2
Ubuntu 12.04 ESM:
dovecot-core 1:2.0.19-0ubuntu2.8
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4110-4
https://usn.ubuntu.com/4110-1
CVE-2019-11500