Ubuntu 3372-1: NSS vulnerability

    Date31 Jul 2017
    CategoryUbuntu
    327
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in NSS.
    ==========================================================================
    Ubuntu Security Notice USN-3372-1
    July 31, 2017
    
    nss vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in NSS.
    
    Software Description:
    - nss: Network Security Service library
    
    Details:
    
    It was discovered that NSS incorrectly handled certain empty SSLv2
    messages. A remote attacker could possibly use this issue to cause NSS
    to crash, resulting in a denial of service. (CVE-2017-7502)
    
    Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple
    DES ciphers were vulnerable to birthday attacks. A remote attacker
    could possibly use this flaw to obtain clear text data from long
    encrypted sessions. This update causes NSS to limit use of the same
    symmetric key. (CVE-2016-2183)
    
    It was discovered that NSS incorrectly handled Base64 decoding. A
    remote attacker could use this flaw to cause NSS to crash, resulting in
    a denial of service, or possibly execute arbitrary code. (CVE-2017-
    5461)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      libnss3                         2:3.28.4-0ubuntu0.12.04.1
    
    This update uses a new upstream release, which includes additional bug
    fixes. After a standard system update you need to restart any
    applications that use NSS, such as Evolution and Chromium, to make all
    the necessary changes.
    
    References:
      https://www.ubuntu.com/usn/usn-3372-1
      CVE-2016-2183, CVE-2017-5461, CVE-2017-7502
    
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