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    Debian: DSA-3223-1: ntp security update

    Date
    200
    Posted By
    Multiple vulnerabilities were discovered in ntp, an implementation of the Network Time Protocol: CVE-2015-1798
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3223-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                        Alessandro Ghedini
    April 12, 2015                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : ntp
    CVE ID         : CVE-2015-1798 CVE-2015-1799
    Debian Bug     : 782095
    
    Multiple vulnerabilities were discovered in ntp, an implementation of the
    Network Time Protocol:
    
    CVE-2015-1798
    
        When configured to use a symmetric key with an NTP peer, ntpd would
        accept packets without MAC as if they had a valid MAC. This could
        allow a remote attacker to bypass the packet authentication and send
        malicious packets without having to know the symmetric key.
    
    CVE-2015-1799
    
        When peering with other NTP hosts using authenticated symmetric
        association, ntpd would update its internal state variables before
        the MAC of the NTP messages was validated. This could allow a remote
        attacker to cause a denial of service by impeding synchronization
        between NTP peers.
    
    Additionally, it was discovered that generating MD5 keys using ntp-keygen
    on big endian machines would either trigger an endless loop, or generate
    non-random keys.
    
    For the stable distribution (wheezy), these problems have been fixed in
    version 1:4.2.6.p5+dfsg-2+deb7u4.
    
    For the unstable distribution (sid), these problems have been fixed in
    version 1:4.2.6.p5+dfsg-7.
    
    We recommend that you upgrade your ntp packages.
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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