Linux Security
    Linux Security
    Linux Security

    Debian: kernel 2.2.20 Privilege escalation vulnerability

    Date 08 Jun 2004
    Posted By LinuxSecurity Advisories
    Due to flushing the TLB too early it is possible for an attacker to trigger a local root exploit. This fix is to the sparc-built kernel and the kernel source.
    Debian Security Advisory DSA 514-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
    June 4th, 2004                 
    - --------------------------------------------------------------------------
    Package        : kernel-source-2.2.20, kernel-image-2.2-sparc
    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) these problems have been fixed in
    version 9woody1 of Linux 2.2 kernel images for the sparc architecture
    and in version 2.2.20-5woody3 of Linux 2.2.20 source.
    For the unstable distribution (sid) these problems have been fixed in
    version 9.1 of Linux 2.2 kernel images for the sparc architecture.
    This problem has been fixed for other architectures already.
    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 4eede8cde6013e6660459173dacd8e4e
          Size/MD5 checksum:   159991 26db63a4af138d5c67c433da29778102
          Size/MD5 checksum: 19394649 57c0edf86cb23a5b215db9121c9b3557
          Size/MD5 checksum:      768 58d7d78f4cc97af50074cafa2322ca7c
          Size/MD5 checksum:    25540 af1005c87ca491c28108fda2a66efb2c
      Architecture independent components:
          Size/MD5 checksum:  1162414 d244e1206d51a785d2a298df8ffbb9e8
          Size/MD5 checksum: 15848780 33170e34a3d4c56e910314be93f0b184
          Size/MD5 checksum:  1122094 e5bdced5ca4b46cffec44e531c238a56
      Sun Sparc architecture:
          Size/MD5 checksum:  1617420 3789f331d7aa2e9c10b3ffee08c82b94
          Size/MD5 checksum:  1653324 e0b6db9b869d1dd51e2a615a0eaef8a1
          Size/MD5 checksum:  2023252 50b820b56ed032a532d5e0bbff5f58b1
          Size/MD5 checksum:  2066292 9144adfbf2bce6098028b69ee28658b8
      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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