Debian LTS: DLA-1884-1: linux security update

    Date13 Aug 2019
    CategoryDebian LTS
    889
    Posted ByLinuxSecurity Advisories
    Debianlts Large
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.
    Package        : linux
    Version        : 3.16.72-1
    CVE ID         : CVE-2017-18509 CVE-2018-20836 CVE-2019-1125 CVE-2019-3900
                     CVE-2019-10207 CVE-2019-10638 CVE-2019-13631 CVE-2019-14283
                     CVE-2019-14284
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service or information
    leaks.
    
    CVE-2017-18509
    
        Denis Andzakovic reported a missing type check in the IPv4 multicast
        routing implementation. A user with the CAP_NET_ADMIN capability (in
        any user namespace) could use this for denial-of-service (memory
        corruption or crash) or possibly for privilege escalation.
    
    CVE-2018-20836
    
        chenxiang reported a race condition in libsas, the kernel
        subsystem supporting Serial Attached SCSI (SAS) devices, which
        could lead to a use-after-free.  It is not clear how this might be
        exploited.
    
    CVE-2019-1125
    
        It was discovered that most x86 processors could speculatively
        skip a conditional SWAPGS instruction used when entering the
        kernel from user mode, and/or could speculatively execute it when
        it should be skipped.  This is a subtype of Spectre variant 1,
        which could allow local users to obtain sensitive information from
        the kernel or other processes.  It has been mitigated by using
        memory barriers to limit speculative execution.  Systems using an
        i386 kernel are not affected as the kernel does not use SWAPGS.
    
    CVE-2019-3900
    
        It was discovered that vhost drivers did not properly control the
        amount of work done to service requests from guest VMs.  A
        malicious guest could use this to cause a denial-of-service
        (unbounded CPU usage) on the host.
    
    CVE-2019-10207
    
        The syzkaller tool found a potential null dereference in various
        drivers for UART-attached Bluetooth adapters.  A local user with
        access to a pty device or other suitable tty device could use this
        for denial-of-service (BUG/oops).
    
    CVE-2019-10638
    
        Amit Klein and Benny Pinkas discovered that the generation of IP
        packet IDs used a weak hash function, "jhash".  This could enable
        tracking individual computers as they communicate with different
        remote servers and from different networks.  The "siphash"
        function is now used instead.
    
    CVE-2019-13631
    
        It was discovered that the gtco driver for USB input tablets could
        overrun a stack buffer with constant data while parsing the device's
        descriptor.  A physically present user with a specially
        constructed USB device could use this to cause a denial-of-service
        (BUG/oops), or possibly for privilege escalation.
    
    CVE-2019-14283
    
        The syzkaller tool found a missing bounds check in the floppy disk
        driver.  A local user with access to a floppy disk device, with a
        disk present, could use this to read kernel memory beyond the
        I/O buffer, possibly obtaining sensitive information.
    
    CVE-2019-14284
    
        The syzkaller tool found a potential division-by-zero in the
        floppy disk driver.  A local user with access to a floppy disk
        device could use this for denial-of-service (oops).
    
    (CVE ID not yet assigned)
    
        Denis Andzakovic reported a possible use-after-free in the
        TCP sockets implementation.  A local user could use this for
        denial-of-service (memory corruption or crash) or possibly
        for privilege escalation.
    
    (CVE ID not yet assigned)
    
        The netfilter conntrack subsystem used kernel addresses as
        user-visible IDs, which could make it easier to exploit other
        security vulnerabilities.
    
    XSA-300
    
        Julien Grall reported that Linux does not limit the amount of memory
        which a domain will attempt to balloon out, nor limits the amount of
        "foreign / grant map" memory which any individual guest can consume,
        leading to denial of service conditions (for host or guests).
    
    For Debian 8 "Jessie", these problems have been fixed in version
    3.16.72-1.
    
    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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