Ubuntu 2567-1: NTP vulnerabilities

    Date13 Apr 2015
    CategoryUbuntu
    55
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in NTP.
    ==========================================================================
    Ubuntu Security Notice USN-2567-1
    April 13, 2015
    
    ntp vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.10
    - Ubuntu 14.04 LTS
    - Ubuntu 12.04 LTS
    
    Summary:
    
    Several security issues were fixed in NTP.
    
    Software Description:
    - ntp: Network Time Protocol daemon and utility programs
    
    Details:
    
    Miroslav Lichvar discovered that NTP incorrectly validated MAC fields. A
    remote attacker could possibly use this issue to bypass authentication and
    spoof packets. (CVE-2015-1798)
    
    Miroslav Lichvar discovered that NTP incorrectly handled certain invalid
    packets. A remote attacker could possibly use this issue to cause a denial
    of service. (CVE-2015-1799)
    
    Juergen Perlinger discovered that NTP incorrectly generated MD5 keys on
    big-endian platforms. This issue could either cause ntp-keygen to hang, or
    could result in non-random keys. (CVE number pending)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.10:
      ntp                             1:4.2.6.p5+dfsg-3ubuntu2.14.10.3
    
    Ubuntu 14.04 LTS:
      ntp                             1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
    
    Ubuntu 12.04 LTS:
      ntp                             1:4.2.6.p3+dfsg-1ubuntu3.4
    
    In general, a standard system update will make all the necessary changes.
    
    References:
      http://www.ubuntu.com/usn/usn-2567-1
      CVE-2015-1798, CVE-2015-1799
    
    Package Information:
      https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.10.3
      https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
      https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p3+dfsg-1ubuntu3.4
    
    
    
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