Linux Security
    Linux Security
    Linux Security

    Debian: kernel 2.2.19 Privilege escalation vulnerability

    Date 08 Mar 2004
    Posted By LinuxSecurity Advisories
    This is the Kernel 2.2.19 backported version of the mremap fix that prevents a local root exploit.
    Debian Security Advisory DSA 456-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
    March 6th, 2004                
    - --------------------------------------------------------------------------
    Package        : kernel-source-2.2.19, kernel-patch-2.2.19-arm, kernel-image-2.2.19-netwinder, kernel-image-2.2.19-riscpc
    Vulnerability  : failing function and TLB flush
    Problem-Type   : local
    Debian-specific: no
    CVE ID         : CAN-2004-0077
    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 20040303 of 2.2 kernel images for the arm architecture.
    For the unstable distribution (sid) this problem will be fixed soon
    for the architectures that still ship a 2.2.x kernel package.
    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:   164319 b9f8b9f3cb28a280475689c370f0c24f
          Size/MD5 checksum:      667 c26b92b6c65d339de908d6e656f042fb
          Size/MD5 checksum: 19144159 1537932c835e5a01bc2d6c3087706e30
          Size/MD5 checksum:      562 c8e2f35175c7ecba9028db915e37aef4
          Size/MD5 checksum:   532339 3b5e94100b2f572db8881b6341bb4757
          Size/MD5 checksum:      646 1e9e65289a4dc58ccbf9a075833d687a
          Size/MD5 checksum:    17807 2eccf623da43a398117926f5cca26774
          Size/MD5 checksum:      614 e228e1d3b31b0c4b1abbb792fc4bb781
          Size/MD5 checksum:    16222 ef1e334b6b9bfb274da499f4890060bf
      Architecture independent components:
          Size/MD5 checksum:  1101030 58d45db197e8bad9dc95d9b9baf918e8
          Size/MD5 checksum:   536998 1a1055497278f58956750e45c323a3d6
      ARM architecture:
          Size/MD5 checksum:  1879720 41e8e0e4b2f0797a1ffecd16d47505a1
          Size/MD5 checksum:  4017076 348d3e5be8f7ee1ac42ee0ad279497db
          Size/MD5 checksum:  1830102 ce66fad5186658470c0ffaf77f822a4c
      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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