Ubuntu 1196-1: eCryptfs vulnerability

    Date23 Aug 2011
    CategoryUbuntu
    61
    Posted ByLinuxSecurity Advisories
    An attacker could use eCryptfs to unmount arbitrary locations and cause a denial of service.
    ==========================================================================
    Ubuntu Security Notice USN-1196-1
    August 23, 2011
    
    ecryptfs-utils vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 11.04
    - Ubuntu 10.10
    - Ubuntu 10.04 LTS
    
    Summary:
    
    An attacker could use eCryptfs to unmount arbitrary locations and cause a
    denial of service.
    
    Software Description:
    - ecryptfs-utils: ecryptfs cryptographic filesystem (utilities)
    
    Details:
    
    It was discovered that eCryptfs incorrectly handled permissions when
    modifying the mtab file. A local attacker could use this flaw to manipulate
    the mtab file, and possibly unmount arbitrary locations, leading to a
    denial of service.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 11.04:
      ecryptfs-utils                  87-0ubuntu1.2
    
    Ubuntu 10.10:
      ecryptfs-utils                  83-0ubuntu3.2.10.10.2
    
    Ubuntu 10.04 LTS:
      ecryptfs-utils                  83-0ubuntu3.2.10.04.2
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-1196-1
      CVE-2011-3145
    
    Package Information:
      https://launchpad.net/ubuntu/+source/ecryptfs-utils/87-0ubuntu1.2
      https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.10.2
      https://launchpad.net/ubuntu/+source/ecryptfs-utils/83-0ubuntu3.2.10.04.2
    
    
    
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