Linux Security
    Linux Security
    Linux Security

    Debian: kernel 2.2.x Privilege escalation vulnerability

    Date 18 Mar 2004
    Posted By LinuxSecurity Advisories
    This patch corrects a root exploit specifically for the 2.2.x kernel on the PowerPC platform.
    Debian Security Advisory DSA 466-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
    March 18th, 2004               
    - --------------------------------------------------------------------------
    Package        : kernel-source-2.2.10, kernel-image-2.2.10-powerpc-apus
    Vulnerability  : failing function and TLB flush
    Problem-Type   : local
    Debian-specific: no
    CVE ID         : CAN-2004-0077
    CERT advisory  : VU#981222
    Paul Starzetz and Wojciech Purczynski of discovered a critical
    security vulnerability in the memory management code of Linux inside
    the mremap(2) system call.  Due to flushing the TLB (Translation
    Lookaside Buffer, an address cache) too early it is possible for an
    attacker to trigger a local root exploit.
    The attack vectors for 2.4.x and 2.2.x kernels are exclusive for the
    respective kernel series, though.  We formerly believed that the
    exploitable vulnerability in 2.4.x does not exist in 2.2.x which is
    still true.  However, it turned out that a second (sort of)
    vulnerability is indeed exploitable in 2.2.x, but not in 2.4.x, with a
    different exploit, of course.
    For the stable distribution (woody) this problem has been fixed in
    version 2.2.10-13woody1 of 2.2 kernel images for the powerpc/apus
    architecture and in version 2.2.10-2 of Linux 2.2.10 source.
    For the unstable distribution (sid) this problem will be fixed soon
    with the 2.4.20 kernel-image package for powerpc/apus.  The old 2.2.10
    kernel image will be removed from Debian unstable.
    You are strongly advised to switch to the fixed 2.4.17 kernel-image
    package for powerpc/apus from woody until the 2.4.20 kernel-image
    package is fixed in the unstable distribution.
    We recommend that you upgrade your Linux kernel package.
    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 3.0 alias woody
    - --------------------------------
      Source archives:
          Size/MD5 checksum:      602 c30270ed0bb5a9b99775aefaff4b5037
          Size/MD5 checksum:    13862 b0dec7f7611601b2aab69d2117298641
          Size/MD5 checksum: 13902979 e3e865f9103dfcea4a3715d66d89dad1
          Size/MD5 checksum:      614 f6f2c6563e5eed7ff97d19551a1117fb
          Size/MD5 checksum:   453378 865a8125d959621697b045edc210e200
      Architecture independent components:
          Size/MD5 checksum:   866978 74d85ee7a1f5855710b3201b907967dd
          Size/MD5 checksum: 11302672 7a66220ced59920d2cc50eff7003108f
      PowerPC architecture:
          Size/MD5 checksum:  1575772 03558d9d86b2c08194088cf5cece6811
          Size/MD5 checksum:  1303764 2a3c5a6a45c3978ae45c4572ddc0547b
      These files will probably be moved into the stable distribution on
      its next revision.
    - ---------------------------------------------------------------------------------
    For apt-get: deb stable/updates main
    For dpkg-ftp: dists/stable/updates/main
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    Package info: `apt-cache show ' and


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