ecryptfs-utils - multiple

Several problems have been discovered in eCryptfs, 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.