Debian: DSA-3364-1: linux security update

    Date21 Sep 2015
    CategoryDebian
    116
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation or denial of service. CVE-2015-0272
    
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    Debian Security Advisory DSA-3364-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                            Ben Hutchings
    September 21, 2015                    https://www.debian.org/security/faq
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    Package        : linux
    CVE ID         : CVE-2015-0272 CVE-2015-2925 CVE-2015-5156 CVE-2015-6252 
                     CVE-2015-6937
    Debian Bug     : 796036
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation or denial of service.
    
    CVE-2015-0272
    
        It was discovered that NetworkManager would set IPv6 MTUs based on
        the values received in IPv6 RAs (Router Advertisements), without
        sufficiently validating these values. A remote attacker could
        exploit this attack to disable IPv6 connectivity. This has been
        mitigated by adding validation in the kernel.
    
    CVE-2015-2925
    
        Jann Horn discovered that when a subdirectory of a filesystem is
        bind-mounted into a container that has its own user and mount
        namespaces, a process with CAP_SYS_ADMIN capability in the user
        namespace can access files outside of the subdirectory.  The
        default Debian configuration mitigated this as it does not allow
        unprivileged users to create new user namespaces.
    
    CVE-2015-5156
    
        Jason Wang discovered that when a virtio_net device is connected
        to a bridge in the same VM, a series of TCP packets forwarded
        through the bridge may cause a heap buffer overflow.  A remote
        attacker could use this to cause a denial of service (crash) or
        possibly for privilege escalation.
    
    CVE-2015-6252
    
        Michael S. Tsirkin of Red Hat Engineering found that the vhost
        driver leaked file descriptors passed to it with the
        VHOST_SET_LOG_FD ioctl command. A privileged local user with access
        to the /dev/vhost-net file, either directly or via libvirt, could
        use this to cause a denial of service (hang or crash).
    
    CVE-2015-6937
    
        It was found that the Reliable Datagram Sockets (RDS) protocol
        implementation did not verify that an underlying transport exists
        when creating a connection.  Depending on how a local RDS
        application initialised its sockets, a remote attacker might be
        able to cause a denial of service (crash) by sending a crafted
        packet.
    
    #796036
    
        Xavier Chantry discovered that the patch provided by the aufs
        project to correct behaviour of memory-mapped files from an aufs
        mount introduced a race condition in the msync() system call.
        Ben Hutchings found that it also introduced a similar bug in the
        madvise_remove() function.  A local attacker could use this to
        cause a denial of service or possibly for privilege escalation.
    
    For the oldstable distribution (wheezy), these problems have been fixed
    in version 3.2.68-1+deb7u4. CVE-2015-2925 and #796036 do not affect the
    wheezy distribution.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 3.16.7-ckt11-1+deb8u4.
    
    We recommend that you upgrade your linux 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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