Linux Security
    Linux Security
    Linux Security

    Debian: Linux 2.6.8 fix several vulnerabilities DSA-1233-1

    Date 10 Dec 2006
    Posted By LinuxSecurity Advisories
    Updated package.
    - --------------------------------------------------------------------------
    Debian Security Advisory DSA 1233-1                    This email address is being protected from spambots. You need JavaScript enabled to view it.                               Dann Frazier
    December 10th, 2006           
    - --------------------------------------------------------------------------
    Package        : kernel-source-2.6.8
    Vulnerability  : several
    Problem-Type   : local/remote
    Debian-specific: no
    CVE ID         : CVE-2006-3741 CVE-2006-4538 CVE-2006-4813 CVE-2006-4997
                     CVE-2006-5174 CVE-2006-5619 CVE-2006-5649 CVE-2006-5751
    Several local and remote vulnerabilities have been discovered in the Linux
    kernel that may lead to a denial of service or the execution of arbitrary
    code. The Common Vulnerabilities and Exposures project identifies the
    following problems:
        Stephane Eranian discovered a local DoS (Denial of Service) vulnerability
        on the ia64 architecture. A local user could exhaust the available file
        descriptors by exploiting a counting error in the permonctl() system call.
        Kirill Korotaev reported a local DoS (Denial of Service) vulnerability
        on the ia64 and sparc architectures. A user could cause the system to
        crash by executing a malformed ELF binary due to insufficient verification
        of the memory layout.
        Dmitriy Monakhov reported a potential memory leak in the
        __block_prepare_write function. __block_prepare_write does not properly
        sanitize kernel buffers during error recovery, which could be exploited
        by local users to gain access to sensitive kernel memory.
        ADLab Venustech Info Ltd reported a potential remote DoS (Denial of
        Service) vulnerability in the IP over ATM subsystem. A remote system
        could cause the system to crash by sending specially crafted packets
        that would trigger an attempt to free an already-freed pointer
        resulting in a system crash.
        Martin Schwidefsky reported a potential leak of sensitive information
        on s390 systems. The copy_from_user function did not clear the remaining
        bytes of the kernel buffer after receiving a fault on the userspace
        address, resulting in a leak of uninitialized kernel memory. A local user
        could exploit this by appending to a file from a bad address.
        James Morris reported a potential local DoS (Denial of Service)
        vulnerability that could be used to hang or oops a system. The seqfile
        handling for /proc/net/ip6_flowlabel has a flaw that can be exploited to
        cause an infinite loop by reading this file after creating a flowlabel.
        Fabio Massimo Di Nitto reported a potential remote DoS (Denial of Service)
        vulnerability on powerpc systems.  The alignment exception only
        checked the exception table for -EFAULT, not for other errors. This can
        be exploited by a local user to cause a system crash (panic).
        Eugene Teo reported a vulnerability in the get_fdb_entries function that
        could potentially be exploited to allow arbitrary code execution with
        escalated priveleges.
        Bill Allombert reported that various mount options are ignored by smbfs
        when UNIX extensions are enabled. This includes the uid, gid and mode
        options. Client systems would silently use the server-provided settings
        instead of honoring these options, changing the security model. This
        update includes a fix from Haroldo Gamal that forces the kernel to honor
        these mount options. Note that, since the current versions of smbmount
        always pass values for these options to the kernel, it is not currently
        possible to activate unix extensions by omitting mount options. However,
        this behavior is currently consistent with the current behavior of the
        next Debian release, 'etch'.
    The following matrix explains which kernel version for which architecture
    fix the problems mentioned above:
                                     Debian 3.1 (sarge)
         Source                      2.6.8-16sarge6
         Alpha architecture          2.6.8-16sarge6
         AMD64 architecture          2.6.8-16sarge6
         HP Precision architecture   2.6.8-6sarge6
         Intel IA-32 architecture    2.6.8-16sarge6
         Intel IA-64 architecture    2.6.8-14sarge6
         Motorola 680x0 architecture 2.6.8-4sarge6
         PowerPC architecture        2.6.8-12sarge6
         IBM S/390 architecture      2.6.8-5sarge6
         Sun Sparc architecture      2.6.8-15sarge6
    The following matrix lists additional packages that were rebuilt for
    compatibility with or to take advantage of this update:
                                     Debian 3.1 (sarge)
         fai-kernels                 1.9.1sarge5
    We recommend that you upgrade your kernel package immediately and reboot
    the machine. If you have built a custom kernel from the kernel source
    package, you will need to rebuild to take advantage of these fixes.
    Upgrade Instructions
    - --------------------
    wget url
            will fetch the file for you
    dpkg -i file.deb
            will install the referenced file.
    If you are using the apt-get package manager, use the line for
    sources.list as given below:
    apt-get update
            will update the internal database
    apt-get upgrade
            will install corrected packages
    You may use an automated update by adding the resources from the
    footer to the proper configuration.
    Debian GNU/Linux 3.1 alias sarge
    - --------------------------------
      Source archives:
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      Intel IA-32 architecture:
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      HP Precision architecture:
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      Intel IA-64 architecture:
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      Motorola 680x0 architecture:
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      These files will probably be moved into the stable distribution on
      its next update.
    - ---------------------------------------------------------------------------------
    For apt-get: deb stable/updates main
    For dpkg-ftp: dists/stable/updates/main
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