Ubuntu Security Notice (C) 2012-2016 Canonical, Inc. / NASL script (C) 2012-2016 Tenable Network Security, Inc.
The remote Ubuntu host is missing a security-related patch.
USN-1284-1 fixed vulnerabilities in Update Manager. One of the fixes
introduced a regression for Kubuntu users attempting to upgrade to a
newer Ubuntu release. This update fixes the problem.
We apologize for the inconvenience.
David Black discovered that Update Manager incorrectly extracted the
downloaded upgrade tarball before verifying its GPG signature. If a
remote attacker were able to perform a man-in-the-middle attack, this
flaw could potentially be used to replace arbitrary files.
David Black discovered that Update Manager created a
temporary directory in an insecure fashion. A local attacker
could possibly use this flaw to read the XAUTHORITY file of
the user performing the upgrade. (CVE-2011-3154)
This update also adds a hotfix to Update Notifier to handle
cases where the upgrade is being performed from CD media.
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 update-manager-core package.
Risk factor :
Medium / CVSS Base Score : 6.4