[SECURITY] [DSA 2382-1] ecryptfs-utils security update

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Debian Security Advisory DSA-2382-1 security@debian.org
http://www.debian.org/security/ Jonathan Wiltshire
January 07, 2012 http://www.debian.org/security/faq
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Package : ecryptfs-utils
Vulnerability : multiple
Problem type : local
Debian-specific: no
CVE ID : CVE-2011-1831 CVE-2011-1832 CVE-2011-1834 CVE-2011-1835
CVE-2011-1837 CVE-2011-3145

Several problems have been discovered in ecryptfs-utils, a cryptographic
filesystem for Linux.

CVE-2011-1831

Vasiliy Kulikov of Openwall 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-2011-1832

Vasiliy Kulikov of Openwall 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-2011-1834

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-2011-1835

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-2011-1837

Vasiliy Kulikov of Openwall discovered that eCryptfs incorrectly handled
lock counters. A local attacker could use this flaw to possibly overwrite
arbitrary files.

We acknowledge the work of the Ubuntu distribution in preparing patches
suitable for near-direct inclusion in the Debian package.

For the oldstable distribution (lenny), these problems have been fixed in
version 68-1+lenny1.

For the stable distribution (squeeze), these problems have been fixed in
version 83-4+squeeze1.

For the testing distribution (wheezy) and the unstable distribution (sid),
these problems have been fixed in version 95-1.

We recommend that you upgrade your ecryptfs-utils packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: http://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org
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