Debian: DSA-4188-1: linux security update

    Date01 May 2018
    CategoryDebian
    3595
    Posted ByAnthony Pell
    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-4188-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    May 01, 2018                          https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : linux
    CVE ID         : CVE-2017-5715 CVE-2017-5753 CVE-2017-17975 CVE-2017-18193
                     CVE-2017-18216 CVE-2017-18218 CVE-2017-18222 CVE-2017-18224
                     CVE-2017-18241 CVE-2017-18257 CVE-2018-1065 CVE-2018-1066
                     CVE-2018-1068 CVE-2018-1092 CVE-2018-1093 CVE-2018-1108
                     CVE-2018-5803 CVE-2018-7480 CVE-2018-7566 CVE-2018-7740
                     CVE-2018-7757 CVE-2018-7995 CVE-2018-8087 CVE-2018-8781
                     CVE-2018-8822 CVE-2018-10323 CVE-2018-1000199
    
    Several vulnerabilities have been discovered in the Linux kernel that
    may lead to a privilege escalation, denial of service or information
    leaks.
    
    CVE-2017-5715
    
        Multiple researchers have discovered a vulnerability in various
        processors supporting speculative execution, 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 Spectre variant 2 (branch
        target injection) and is mitigated for the x86 architecture (amd64
        and i386) by using the "retpoline" compiler feature which allows
        indirect branches to be isolated from speculative execution.
    
    CVE-2017-5753
    
        Multiple researchers have discovered a vulnerability in various
        processors supporting speculative execution, 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 Spectre variant 1
        (bounds-check bypass) and is mitigated by identifying vulnerable
        code sections (array bounds checking followed by array access) and
        replacing the array access with the speculation-safe
        array_index_nospec() function.
    
        More use sites will be added over time.
    
    CVE-2017-17975
    
        Tuba Yavuz reported a use-after-free flaw in the USBTV007
        audio-video grabber driver. A local user could use this for denial
        of service by triggering failure of audio registration.
    
    CVE-2017-18193
    
        Yunlei He reported that the f2fs implementation does not properly
        handle extent trees, allowing a local user to cause a denial of
        service via an application with multiple threads.
    
    CVE-2017-18216
    
        Alex Chen reported that the OCFS2 filesystem failed to hold a
        necessary lock during nodemanager sysfs file operations,
        potentially leading to a null pointer dereference.  A local user
        could use this for denial of service.
    
    CVE-2017-18218
    
        Jun He reported a user-after-free flaw in the Hisilicon HNS ethernet
        driver. A local user could use this for denial of service.
    
    CVE-2017-18222
    
        It was reported that the Hisilicon Network Subsystem (HNS) driver
        implementation does not properly handle ethtool private flags. A
        local user could use this for denial of service or possibly have
        other impact.
    
    CVE-2017-18224
    
        Alex Chen reported that the OCFS2 filesystem omits the use of a
        semaphore and consequently has a race condition for access to the
        extent tree during read operations in DIRECT mode. A local user
        could use this for denial of service.
    
    CVE-2017-18241
    
        Yunlei He reported that the f2fs implementation does not properly
        initialise its state if the "noflush_merge" mount option is used.
        A local user with access to a filesystem mounted with this option
        could use this to cause a denial of service.
    
    CVE-2017-18257
    
        It was reported that the f2fs implementation is prone to an infinite
        loop caused by an integer overflow in the __get_data_block()
        function. A local user can use this for denial of service via
        crafted use of the open and fallocate system calls with an
        FS_IOC_FIEMAP ioctl.
    
    CVE-2018-1065
    
        The syzkaller tool found a NULL pointer dereference flaw in the
        netfilter subsystem when handling certain malformed iptables
        rulesets. A local user with the CAP_NET_RAW or CAP_NET_ADMIN
        capability (in any user namespace) could use this to cause a denial
        of service. Debian disables unprivileged user namespaces by default.
    
    CVE-2018-1066
    
        Dan Aloni reported to Red Hat that the CIFS client implementation
        would dereference a null pointer if the server sent an invalid
        response during NTLMSSP setup negotiation.  This could be used
        by a malicious server for denial of service.
    
    CVE-2018-1068
    
        The syzkaller tool found that the 32-bit compatibility layer of
        ebtables did not sufficiently validate offset values. On a 64-bit
        kernel, a local user with the CAP_NET_ADMIN capability (in any user
        namespace) could use this to overwrite kernel memory, possibly
        leading to privilege escalation. Debian disables unprivileged user
        namespaces by default.
    
    CVE-2018-1092
    
        Wen Xu reported that a crafted ext4 filesystem image would
        trigger a null dereference when mounted.  A local user able
        to mount arbitrary filesystems could use this for denial of
        service.
    
    CVE-2018-1093
    
        Wen Xu reported that a crafted ext4 filesystem image could trigger
        an out-of-bounds read in the ext4_valid_block_bitmap() function. A
        local user able to mount arbitrary filesystems could use this for
        denial of service.
    
    CVE-2018-1108
    
        Jann Horn reported that crng_ready() does not properly handle the
        crng_init variable states and the RNG could be treated as
        cryptographically safe too early after system boot.
    
    CVE-2018-5803
    
        Alexey Kodanev reported that the SCTP protocol did not range-check
        the length of chunks to be created.  A local or remote user could
        use this to cause a denial of service.
    
    CVE-2018-7480
    
        Hou Tao discovered a double-free flaw in the blkcg_init_queue()
        function in block/blk-cgroup.c. A local user could use this to cause
        a denial of service or have other impact.
    
    CVE-2018-7566
    
        Fan LongFei reported a race condition in the ALSA (sound)
        sequencer core, between write and ioctl operations.  This could
        lead to an out-of-bounds access or use-after-free.  A local user
        with access to a sequencer device could use this for denial of
        service or possibly for privilege escalation.
    
    CVE-2018-7740
    
        Nic Losby reported that the hugetlbfs filesystem's mmap operation
        did not properly range-check the file offset.  A local user with
        access to files on a hugetlbfs filesystem could use this to cause
        a denial of service.
    
    CVE-2018-7757
    
        Jason Yan reported a memory leak in the SAS (Serial-Attached
        SCSI) subsystem.  A local user on a system with SAS devices
        could use this to cause a denial of service.
    
    CVE-2018-7995
    
        Seunghun Han reported a race condition in the x86 MCE
        (Machine Check Exception) driver.  This is unlikely to have
        any security impact.
    
    CVE-2018-8087
    
        A memory leak flaw was found in the hwsim_new_radio_nl() function in
        the simulated radio testing tool driver for mac80211, allowing a
        local user to cause a denial of service.
    
    CVE-2018-8781
    
        Eyal Itkin reported that the udl (DisplayLink) driver's mmap
        operation did not properly range-check the file offset.  A local
        user with access to a udl framebuffer device could exploit this to
        overwrite kernel memory, leading to privilege escalation.
    
    CVE-2018-8822
    
        Dr Silvio Cesare of InfoSect reported that the ncpfs client
        implementation did not validate reply lengths from the server.  An
        ncpfs server could use this to cause a denial of service or
        remote code execution in the client.
    
    CVE-2018-10323
    
        Wen Xu reported a NULL pointer dereference flaw in the
        xfs_bmapi_write() function triggered when mounting and operating a
        crafted xfs filesystem image. A local user able to mount arbitrary
        filesystems could use this for denial of service.
    
    CVE-2018-1000199
    
        Andy Lutomirski discovered that the ptrace subsystem did not
        sufficiently validate hardware breakpoint settings.  Local users
        can use this to cause a denial of service, or possibly for
        privilege escalation, on x86 (amd64 and i386) and possibly other
        architectures.
    
    For the stable distribution (stretch), these problems have been fixed in
    version 4.9.88-1.
    
    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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