Debian: DSA-4497-1: linux security update

    Date12 Aug 2019
    CategoryDebian
    2808
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks.
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-4497-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                            Ben Hutchings
    August 13, 2019                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : linux
    CVE ID         : CVE-2015-8553 CVE-2018-5995 CVE-2018-20836 CVE-2018-20856
                     CVE-2019-1125 CVE-2019-3882 CVE-2019-3900 CVE-2019-10207
                     CVE-2019-10638 CVE-2019-10639 CVE-2019-13631 CVE-2019-13648
                     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-2015-8553
    
        Jan Beulich discovered that CVE-2015-2150 was not completely
        addressed.  If a PCI physical function is passed through to a
        Xen guest, the guest is able to access its memory and I/O
        regions before enabling decoding of those regions.  This could
        result in a denial-of-service (unexpected NMI) on the host.
    
        The fix for this is incompatible with qemu versions before 2.5.
    
    (CVE ID not yet assigned)
    
        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-2018-5995
    
        ADLab of VenusTech discovered that the kernel logged the virtual
        addresses assigned to per-CPU data, which could make it easier to
        exploit other vulnerabilities.
    
    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-2018-20856
    
        Xiao Jin reported a potential double-free in the block subsystem,
        in case an error occurs while initialising the I/O scheduler for a
        block device.  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-2019-3882
    
        It was found that the vfio implementation did not limit the number
        of DMA mappings to device memory.  A local user granted ownership
        of a vfio device could use this to cause a denial of service
        (out-of-memory condition).
    
    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-2019-10639
    
        Amit Klein and Benny Pinkas discovered that the generation of IP
        packet IDs used a weak hash function that incorporated a kernel
        virtual address.  This hash function is no longer used for IP IDs,
        although it is still used for other purposes in the network stack.
    
    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-2019-13648
    
        Praveen Pandey reported that on PowerPC (ppc64el) systems without
        Transactional Memory (TM), the kernel would still attempt to
        restore TM state passed to the sigreturn() system call.  A local
        user could use this for denial-of-service (oops).
    
    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 baloon 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 the oldstable distribution (stretch), these problems have been fixed
    in version 4.9.168-1+deb9u5.
    
    For the stable distribution (buster), these problems were mostly fixed
    in version 4.19.37-5+deb10u2 or earlier.
    
    We recommend that you upgrade your linux packages.
    
    For the detailed security status of linux please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/linux
    
    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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