Linux Security
    Linux Security
    Linux Security

    Debian: kernel 2.2.x (alpha) Privilege escalation vulnerability

    Date 03 Mar 2004
    Posted By LinuxSecurity Advisories
    This is the alpha-chip version of the kernel 2.2.x patch Debian released yesterday.
    Debian Security Advisory DSA 454-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
    March 2nd, 2004                
    - --------------------------------------------------------------------------
    Package        : kernel-source-2.2.22, kernel-image-2.2.22-alpha
    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
    the following versions and architectures:
       kernel-source-2.2.22                source    2.2.22-1woody1
       kernel-image-2.2.22-alpha           alpha     2.2.22-2
    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:      661 2f5744d0e7d68932d8910d15583ed820
          Size/MD5 checksum:   146548 51478245f5608894bbb59223172f9cb3
          Size/MD5 checksum: 19313552 af9832dc10026cf03b2682f296ccd051
          Size/MD5 checksum:      870 ac538b47a782ae11686e2c5d0c3bb6f5
          Size/MD5 checksum:     7451 6107bb5e1e7ae0aa4e3f9417fced0717
      Architecture independent components:
          Size/MD5 checksum:  1162368 805cf7d09f69b14ebcb392038de5a6b1
          Size/MD5 checksum: 15759754 55d31894b93cb9633caaa6a0eddbf998
      Alpha architecture:
          Size/MD5 checksum:  1871248 c762109e412ef7d3e31bebb868e668ce
          Size/MD5 checksum:  2782898 99c876bdab97812cb5ebdfdb1c88d224
          Size/MD5 checksum:  2299174 ac17d87dbb6558c83b723fb97808f721
          Size/MD5 checksum:  2537032 9a3194224faccec6081ee06d9926be09
          Size/MD5 checksum:  2878172 6ad070e82c301504d845692688012fed
      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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