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             AUSCERT External Security Bulletin Redistribution

                           linux security update
                               29 June 2016


        AusCERT Security Bulletin Summary

Product:           Linux kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Root Compromise          -- Existing Account      
                   Denial of Service        -- Existing Account      
                   Access Confidential Data -- Remote/Unauthenticated
                   Reduced Security         -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5244 CVE-2016-5243 CVE-2016-4998
                   CVE-2016-4997 CVE-2016-4913 CVE-2016-4805
                   CVE-2016-4581 CVE-2016-4580 CVE-2016-4578
                   CVE-2016-4569 CVE-2016-4565 CVE-2016-4486
                   CVE-2016-4485 CVE-2016-4482 CVE-2016-4470
                   CVE-2016-3961 CVE-2016-3955 CVE-2016-3951
                   CVE-2016-3672 CVE-2016-3157 CVE-2016-3156
                   CVE-2016-3140 CVE-2016-3138 CVE-2016-3137
                   CVE-2016-3136 CVE-2016-3134 CVE-2016-3070
                   CVE-2016-2187 CVE-2016-2186 CVE-2016-2185
                   CVE-2016-2184 CVE-2016-2143 CVE-2016-2117
                   CVE-2016-1583 CVE-2016-1237 CVE-2016-0821

Reference:         ESB-2016.1608

Original Bulletin: 

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Debian Security Advisory DSA-3607-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
June 28, 2016                         https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2015-7515 CVE-2016-0821 CVE-2016-1237 CVE-2016-1583
                 CVE-2016-2117 CVE-2016-2143 CVE-2016-2184 CVE-2016-2185
                 CVE-2016-2186 CVE-2016-2187 CVE-2016-3070 CVE-2016-3134
                 CVE-2016-3136 CVE-2016-3137 CVE-2016-3138 CVE-2016-3140
                 CVE-2016-3156 CVE-2016-3157 CVE-2016-3672 CVE-2016-3951
                 CVE-2016-3955 CVE-2016-3961 CVE-2016-4470 CVE-2016-4482
                 CVE-2016-4485 CVE-2016-4486 CVE-2016-4565 CVE-2016-4569
                 CVE-2016-4578 CVE-2016-4580 CVE-2016-4581 CVE-2016-4805
                 CVE-2016-4913 CVE-2016-4997 CVE-2016-4998 CVE-2016-5243

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

CVE-2015-7515, CVE-2016-2184, CVE-2016-2185, CVE-2016-2186,
CVE-2016-2187, CVE-2016-3136, CVE-2016-3137, CVE-2016-3138,

    Ralf Spenneberg of OpenSource Security reported that various USB
    drivers do not sufficiently validate USB descriptors.  This
    allowed a physically present user with a specially designed USB
    device to cause a denial of service (crash).


    Solar Designer noted that the list 'poisoning' feature, intended
    to mitigate the effects of bugs in list manipulation in the
    kernel, used poison values within the range of virtual addresses
    that can be allocated by user processes.


    David Sinquin discovered that nfsd does not check permissions when
    setting ACLs, allowing users to grant themselves permissions to a
    file by setting the ACL.


    Jann Horn of Google Project Zero reported that the eCryptfs
    filesystem could be used together with the proc filesystem to
    cause a kernel stack overflow.  If the ecryptfs-utils package is
    installed, local users could exploit this, via the
    mount.ecryptfs_private program, for denial of service (crash) or
    possibly for privilege escalation.


    Justin Yackoski of Cryptonite discovered that the Atheros L2
    ethernet driver incorrectly enables scatter/gather I/O. A remote
    attacker could take advantage of this flaw to obtain potentially
    sensitive information from kernel memory.


    Marcin Koscielnicki discovered that the fork implementation in the
    Linux kernel on s390 platforms mishandles the case of four
    page-table levels, which allows local users to cause a denial of
    service (system crash).


    Jan Stancek of Red Hat discovered a local denial of service
    vulnerability in AIO handling.


    The Google Project Zero team found that the netfilter subsystem does
    not sufficiently validate filter table entries. A user with the
    CAP_NET_ADMIN capability could use this for denial of service
    (crash) or possibly for privilege escalation. Debian disables
    unprivileged user namespaces by default, if locally enabled with the
    kernel.unprivileged_userns_clone sysctl, this allows privilege


    Solar Designer discovered that the IPv4 implementation in the Linux
    kernel did not perform the destruction of inet device objects
    properly. An attacker in a guest OS could use this to cause a denial
    of service (networking outage) in the host OS.

CVE-2016-3157 / XSA-171

    Andy Lutomirski discovered that the x86_64 (amd64) task switching
    implementation did not correctly update the I/O permission level
    when running as a Xen paravirtual (PV) guest.  In some
    configurations this would allow local users to cause a denial of
    service (crash) or to escalate their privileges within the guest.


    Hector Marco and Ismael Ripoll noted that it was possible to disable
    Address Space Layout Randomisation (ASLR) for x86_32 (i386) programs
    by removing the stack resource limit. This made it easier for local
    users to exploit security flaws in programs that have the setuid or
    setgid flag set.


    It was discovered that the cdc_ncm driver would free memory
    prematurely if certain errors occurred during its initialisation.
    This allowed a physically present user with a specially designed
    USB device to cause a denial of service (crash) or possibly to
    escalate their privileges.


    Ignat Korchagin reported that the usbip subsystem did not check
    the length of data received for a USB buffer.  This allowed denial
    of service (crash) or privilege escalation on a system configured
    as a usbip client, by the usbip server or by an attacker able to
    impersonate it over the network.  A system configured as a usbip
    server might be similarly vulnerable to physically present users.

CVE-2016-3961 / XSA-174

    Vitaly Kuznetsov of Red Hat discovered that Linux allowed the use of
    hugetlbfs on x86 (i386 and amd64) systems even when running as a Xen
    paravirtualised (PV) guest, although Xen does not support huge
    pages. This allowed users with access to /dev/hugepages to cause a
    denial of service (crash) in the guest.


    David Howells of Red Hat discovered that a local user can trigger a
    flaw in the Linux kernel's handling of key lookups in the keychain
    subsystem, leading to a denial of service (crash) or possibly to
    privilege escalation.

CVE-2016-4482, CVE-2016-4485, CVE-2016-4486, CVE-2016-4569,
CVE-2016-4578, CVE-2016-4580, CVE-2016-5243, CVE-2016-5244

    Kangjie Lu reported that the USB devio, llc, rtnetlink, ALSA
    timer, x25, tipc, and rds facilities leaked information from the
    kernel stack.


    Jann Horn of Google Project Zero reported that various components
    in the InfiniBand stack implemented unusual semantics for the
    write() operation.  On a system with InfiniBand drivers loaded,
    local users could use this for denial of service or privilege


    Tycho Andersen discovered that in some situations the Linux kernel
    did not handle propagated mounts correctly. A local user can take
    advantage of this flaw to cause a denial of service (system crash).


    Baozeng Ding discovered a use-after-free in the generic PPP layer in
    the Linux kernel. A local user can take advantage of this flaw to
    cause a denial of service (system crash), or potentially escalate
    their privileges.


    Al Viro found that the ISO9660 filesystem implementation did not
    correctly count the length of certain invalid name entries.
    Reading a directory containing such name entries would leak
    information from kernel memory.  Users permitted to mount disks or
    disk images could use this to obtain sensitive information.

CVE-2016-4997 / CVE-2016-4998

    Jesse Hertz and Tim Newsham discovered that missing input sanitising
    in Netfilter socket handling may result in denial of service. Debian
    disables unprivileged user namespaces by default, if locally enabled
    with the kernel.unprivileged_userns_clone sysctl, this also allows
    privilege escalation.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt25-2+deb8u2.

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: debian-security-announce@lists.debian.org
Version: GnuPG v1


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