ESB-2018.1663 - [Debian] kernel: Denial of service - Existing account 2018-06-04

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             AUSCERT External Security Bulletin Redistribution

               [SECURITY] [DLA 1392-1] linux security update
                                4 June 2018


        AusCERT Security Bulletin Summary

Product:           kernel
Publisher:         Debian
Operating System:  Debian GNU/Linux 7
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10940 CVE-2018-8897 CVE-2018-1130

Reference:         ASB-2018.0107

Original Bulletin:

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Package        : linux
Version        : 3.2.102-1
CVE ID         : CVE-2018-1093 CVE-2018-1130 CVE-2018-8897 CVE-2018-10940
Debian Bug     : 898100

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a denial of service.


    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.


    The syzbot software found that the DCCP implementation of
    sendmsg() does not check the socket state, potentially leading
    to a null pointer dereference.  A local user could use this to
    cause a denial of service (crash).


    Nick Peterson of Everdox Tech LLC discovered that #DB exceptions
    that are deferred by MOV SS or POP SS are not properly handled,
    allowing an unprivileged user to crash the kernel and cause a
    denial of service.


    Dan Carpenter reported that the cdrom driver does not correctly
    validate the parameter to the CDROM_MEDIA_CHANGED ioctl.  A user
    with access to a cdrom device could use this to cause a denial of
    service (crash).

For Debian 7 "Wheezy", these problems have been fixed in version
3.2.102-1.  This version also includes bug fixes from upstream version
3.2.102, including a fix for a regression in the SCTP implementation
in version 3.2.101.

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:
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams

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