[SECURITY] [DLA 1232-1] linux security update

[Ben Hutchings <benh@debian.org>]

Package        : linux
Version        : 3.2.96-3
CVE ID         : CVE-2017-5754 CVE-2017-17558 CVE-2017-17741 CVE-2017-17805 
                 CVE-2017-17806 CVE-2017-17807

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

CVE-2017-5754

    Multiple researchers have discovered a vulnerability in Intel
    processors, enabling an attacker controlling an unprivileged
    process to read memory from arbitrary addresses, including from
    the kernel and all other processes running on the system.

    This specific attack has been named Meltdown and is addressed in
    the Linux kernel for the Intel x86-64 architecture by a patch set
    named Kernel Page Table Isolation, enforcing a near complete
    separation of the kernel and userspace address maps and preventing
    the attack. This solution might have a performance impact, and can
    be disabled at boot time by passing `pti=off' to the kernel
    command line.

CVE-2017-17558

    Andrey Konovalov reported that that USB core did not correctly
    handle some error conditions during initialisation.  A physically
    present user with a specially designed USB device can use this to
    cause a denial of service (crash or memory corruption), or
    possibly for privilege escalation.

CVE-2017-17741

    Dmitry Vyukov reported that the KVM implementation for x86 would
    over-read data from memory when emulating an MMIO write if the
    kvm_mmio tracepoint was enabled.  A guest virtual machine might be
    able to use this to cause a denial of service (crash).

CVE-2017-17805

    It was discovered that some implementations of the Salsa20 block
    cipher did not correctly handle zero-length input.  A local user
    could use this to cause a denial of service (crash) or possibly
    have other security impact.

CVE-2017-17806

    It was discovered that the HMAC implementation could be used with
    an underlying hash algorithm that requires a key, which was not
    intended.  A local user could use this to cause a denial of
    service (crash or memory corruption), or possibly for privilege
    escalation.

CVE-2017-17807

    Eric Biggers discovered that the KEYS subsystem lacked a check for
    write permission when adding keys to a process's default keyring.
    A local user could use this to cause a denial of service or to
    obtain sensitive information.

For Debian 7 "Wheezy", these problems have been fixed in version
3.2.96-3.

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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