Ubuntu 10.04 LTS / 10.10 / 11.04 : ecryptfs-utils vulnerabilities (USN-1188-1)

Ubuntu Security Notice (C) 2011-2014 Canonical, Inc. / NASL script (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly
validated permissions on the requested mountpoint. A local attacker
could use this flaw to mount to arbitrary locations, leading to
privilege escalation. (CVE-2011-1831)

Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly
validated permissions on the requested mountpoint. A local attacker
could use this flaw to unmount to arbitrary locations, leading to a
denial of service. (CVE-2011-1832)

Vasiliy Kulikov and Dan Rosenberg discovered that eCryptfs incorrectly
validated permissions on the requested source directory. A local
attacker could use this flaw to mount an arbitrary directory, possibly
leading to information disclosure. A pending kernel update will
provide the other half of the fix for this issue. (CVE-2011-1833)

Dan Rosenberg and Marc Deslauriers discovered that eCryptfs
incorrectly handled modifications to the mtab file when an error
occurs. A local attacker could use this flaw to corrupt the mtab file,
and possibly unmount arbitrary locations, leading to a denial of
service. (CVE-2011-1834)

Marc Deslauriers discovered that eCryptfs incorrectly handled keys
when setting up an encrypted private directory. A local attacker could
use this flaw to manipulate keys during creation of a new user.
(CVE-2011-1835)

Marc Deslauriers discovered that eCryptfs incorrectly handled
permissions during recovery. A local attacker could use this flaw to
possibly access another user's data during the recovery process. This
issue only applied to Ubuntu 11.04. (CVE-2011-1836)

Vasiliy Kulikov discovered that eCryptfs incorrectly handled lock
counters. A local attacker could use this flaw to possibly overwrite
arbitrary files. The default symlink restrictions in Ubuntu 10.10 and
11.04 should protect against this issue. (CVE-2011-1837).

Solution :

Update the affected ecryptfs-utils package.

Risk factor :

Medium / CVSS Base Score : 4.6
(CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P)

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 55810 ()

Bugtraq ID:

CVE ID: CVE-2011-1831
CVE-2011-1832
CVE-2011-1833
CVE-2011-1834
CVE-2011-1835
CVE-2011-1836
CVE-2011-1837