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Debian Security Advisory DSA-3659-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
September 04, 2016                    https://www.debian.org/security/faq
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Package        : linux
CVE ID         : CVE-2016-5696 CVE-2016-6136 CVE-2016-6480 CVE-2016-6828

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

CVE-2016-5696

    Yue Cao, Zhiyun Qian, Zhongjie Wang, Tuan Dao, and Srikanth V.
    Krishnamurthy of the University of California, Riverside; and Lisa
    M. Marvel of the United States Army Research Laboratory discovered
    that Linux's implementation of the TCP Challenge ACK feature
    results in a side channel that can be used to find TCP connections
    between specific IP addresses, and to inject messages into those
    connections.

    Where a service is made available through TCP, this may allow
    remote attackers to impersonate another connected user to the
    server or to impersonate the server to another connected user.  In
    case the service uses a protocol with message authentication
    (e.g. TLS or SSH), this vulnerability only allows denial of
    service (connection failure).  An attack takes tens of seconds, so
    short-lived TCP connections are also unlikely to be vulnerable.

    This may be mitigated by increasing the rate limit for TCP
    Challenge ACKs so that it is never exceeded:
        sysctl net.ipv4.tcp_challenge_ack_limit=1000000000

CVE-2016-6136

    Pengfei Wang discovered that the audit subsystem has a
    'double-fetch' or 'TOCTTOU' bug in its handling of special
    characters in the name of an executable.  Where audit logging of
    execve() is enabled, this allows a local user to generate
    misleading log messages.

CVE-2016-6480

    Pengfei Wang discovered that the aacraid driver for Adaptec RAID
    controllers has a 'double-fetch' or 'TOCTTOU' bug in its
    validation of 'FIB' messages passed through the ioctl() system
    call.  This has no practical security impact in current Debian
    releases.

CVE-2016-6828

    Marco Grassi reported a 'use-after-free' bug in the TCP
    implementation, which can be triggered by local users.  The
    security impact is unclear, but might include denial of service or
    privilege escalation.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.36-1+deb8u1. In addition, this update contains several
changes originally targeted for the upcoming jessie point release.

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
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