Debian: DSA-3659-1: linux security update

    Date04 Sep 2016
    CategoryDebian
    42
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or have other impacts.
    
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    Debian Security Advisory DSA-3659-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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