Debian Security Advisory

DSA-2382-1 ecryptfs-utils -- multiple vulnerabilities

Date Reported:
07 Jan 2012
Affected Packages:
ecryptfs-utils
Vulnerable:
Yes
Security database references:
In Mitre's CVE dictionary: CVE-2011-1831, CVE-2011-1832, CVE-2011-1834, CVE-2011-1835, CVE-2011-1837, CVE-2011-3145.
More information:

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.