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[SECURITY] [DLA 993-1] linux security update

Package        : linux
Version        : 3.2.89-1
CVE ID         : CVE-2017-0605 CVE-2017-7487 CVE-2017-7645 CVE-2017-7895 
                 CVE-2017-8890 CVE-2017-8924 CVE-2017-8925 CVE-2017-9074 
                 CVE-2017-9075 CVE-2017-9076 CVE-2017-9077 CVE-2017-9242 

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information


    A buffer overflow flaw was discovered in the trace subsystem.


    Li Qiang reported a reference counter leak in the ipxitf_ioctl
    function which may result into a use-after-free vulnerability,
    triggerable when a IPX interface is configured.


    Tuomas Haanpaa and Matti Kamunen from Synopsys Ltd discovered that
    the NFSv2 and NFSv3 server implementations are vulnerable to an
    out-of-bounds memory access issue while processing arbitrarily long
    arguments sent by NFSv2/NFSv3 PRC clients, leading to a denial of


    Ari Kauppi from Synopsys Ltd discovered that the NFSv2 and NFSv3
    server implementations do not properly handle payload bounds
    checking of WRITE requests. A remote attacker with write access to a
    NFS mount can take advantage of this flaw to read chunks of
    arbitrary memory from both kernel-space and user-space.


    It was discovered that the net_csk_clone_lock() function allows a
    remote attacker to cause a double free leading to a denial of
    service or potentially have other impact.


    Johan Hovold found that the io_ti USB serial driver could leak
    sensitive information if a malicious USB device was connected.


    Johan Hovold found a reference counter leak in the omninet USB
    serial driver, resulting in a use-after-free vulnerability.  This
    can be triggered by a local user permitted to open tty devices.


    Andrey Konovalov reported that the IPv6 fragmentation
    implementation could read beyond the end of a packet buffer.  A
    local user or guest VM might be able to use this to leak sensitive
    information or to cause a denial of service (crash).


    Andrey Konovalov reported that the SCTP/IPv6 implementation
    wrongly initialised address lists on connected sockets, resulting
    in a use-after-free vulnerability, a similar issue to
    CVE-2017-8890.  This can be triggered by any local user.

CVE-2017-9076 / CVE-2017-9077

    Cong Wang found that the TCP/IPv6 and DCCP/IPv6 implementations
    wrongly initialised address lists on connected sockets, a similar
    issue to CVE-2017-9075.


    Andrey Konovalov reported a packet buffer overrun in the IPv6
    implementation.  A local user could use this for denial of service
    (memory corruption; crash) and possibly for privilege escalation.


    The Qualys Research Labs discovered that the size of the stack guard
    page is not sufficiently large. The stack-pointer can jump over the
    guard-page and moving from the stack into another memory region
    without accessing the guard-page. In this case no page-fault
    exception is raised and the stack extends into the other memory
    region. An attacker can exploit this flaw for privilege escalation.

    The default stack gap protection is set to 256 pages and can be
    configured via the stack_guard_gap kernel parameter on the kernel
    command line.

    Further details can be found at

For Debian 7 "Wheezy", these problems have been fixed in version
3.2.89-1.  This version also includes bug fixes from upstream version

For Debian 8 "Jessie", these problems have been fixed in version

For Debian 9 "Stretch", these problems have been fixed in version
4.9.30-2+deb9u1 or earlier versions before the stretch release.

We recommend that you upgrade your linux packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

Ben Hutchings - Debian developer, member of kernel, installer and LTS teams

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