Ubuntu Security Notice (C) 2017 Canonical, Inc. / NASL script (C) 2017 Tenable Network Security, Inc.
The remote Ubuntu host is missing a security-related patch.
USN-3258-1 intended to fix a vulnerability in Dovecot. Further
investigation revealed that only Dovecot versions 2.2.26 and newer
were affected by the vulnerability. Additionally, the change
introduced a regression when Dovecot was configured to use the 'dict'
authentication database. This update reverts the change. We apologize
for the inconvenience.
It was discovered that Dovecot incorrectly handled some usernames. An
attacker could possibly use this issue to cause Dovecot to hang or
crash, resulting in a denial of service.
Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.
Update the affected dovecot-core package.
Risk factor :
High / CVSS Base Score : 7.8
CVSS Temporal Score : 6.4
Public Exploit Available : true