Ubuntu 3430-2: Dnsmasq vulnerabilities

    Date03 Oct 2017
    CategoryUbuntu
    77
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in Dnsmasq.
    ==========================================================================
    Ubuntu Security Notice USN-3430-2
    October 03, 2017
    
    dnsmasq vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in Dnsmasq.
    
    Software Description:
    - dnsmasq: Small caching DNS proxy and DHCP/TFTP server
    
    Details:
    
    USN-3430-1 fixed several vulnerabilities in Dnsmasq. This update
    provides the corresponding update for Ubuntu 12.04 ESM.
    
    Original advisory details:
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled DNS requests. A remote
     attacker could use this issue to cause Dnsmasq to crash, resulting in
     a denial of service, or possibly execute arbitrary code. 
     (CVE-2017-14491)
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled IPv6 router
     advertisements. A remote attacker could use this issue to cause
     Dnsmasq to crash, resulting in a denial of service, or possibly
     execute arbitrary code. (CVE-2017-14492)
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled DHCPv6 requests. A remote
     attacker could use this issue to cause Dnsmasq to crash, resulting in
     a denial of service, or possibly execute arbitrary code. 
     (CVE-2017-14493)
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled DHCPv6 packets. A remote
     attacker could use this issue to possibly obtain sensitive memory
     contents. (CVE-2017-14494)
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled DNS requests. A remote
     attacker could use this issue to cause Dnsmasq to consume memory,
     resulting in a denial of service. (CVE-2017-14495)
    
     Felix Wilhelm, Fermin J. Serna, Gabriel Campana and Kevin Hamacher
     discovered that Dnsmasq incorrectly handled DNS requests. A remote
     attacker could use this issue to cause Dnsmasq to crash, resulting in
     a denial of service. (CVE-2017-14496)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      dnsmasq                         2.59-4ubuntu0.3
      dnsmasq-base                    2.59-4ubuntu0.3
      dnsmasq-utils                   2.59-4ubuntu0.3
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://www.ubuntu.com/usn/usn-3430-2
      https://www.ubuntu.com/usn/usn-3430-1
      CVE-2017-14491, CVE-2017-14492, CVE-2017-14493, CVE-2017-14494,
      CVE-2017-14495, CVE-2017-14496
    
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