Hacker exposes Linux/PDF flaw
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Thread: Hacker exposes Linux/PDF flaw

  1. #1
    Senior Member
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    Hacker exposes Linux/PDF flaw

    Hereby an interseting paper about a *nix vuln with acrobat reader.
    It seems there is no workaround yet.

    Pay attention when reading PDF and using PDF inside hyperlink....

    Full article here
    In the report, Gilmore described a problem in the way that PDF viewing programs for the Unix platform process hyperlinks within valid PDF documents.

    When processing hyperlinks, common PDF readers use the Unix "shell" command to launch and pass commands to external programs. For example, clicking on a hyperlink for a web page would launch the associated web browser, according to the report.

    However, Gilmore found that such programs do not properly check the syntax of such commands, enabling arbitrary shell commands to be executed on the vulnerable machine.

    While attackers are limited by the privilege level of the user clicking the malicious link, the vulnerability could enable a remote attacker to use shell commands to delete files from the user's hard drive or perform other actions without the knowledge of the victim, the report said.
    [shadow] SHARING KNOWLEDGE[/shadow]

  2. #2
    Senior Member tampabay420's Avatar
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    hey, thats a pretty bg flaw... thanx for the heads up!
    yeah, I\'m gonna need that by friday...

  3. #3
    Senior Member tampabay420's Avatar
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    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    - ---------------------------------------------------------------------
    Red Hat Security Advisory

    Synopsis: Updated Xpdf packages fix security vulnerability
    Advisory ID: RHSA-2003:196-01
    Issue date: 2003-06-18
    Updated on: 2003-06-18
    Product: Red Hat Linux
    Keywords:
    Cross references:
    Obsoletes: RHSA-2003:137
    CVE Names: CAN-2003-0434
    - ---------------------------------------------------------------------

    1. Topic:

    Updated Xpdf packages are available that fix a vulnerability where a
    malicious PDF document could run arbitrary code.

    2. Relevant releases/architectures:

    Red Hat Linux 7.1 - i386
    Red Hat Linux 7.2 - i386, ia64
    Red Hat Linux 7.3 - i386
    Red Hat Linux 8.0 - i386
    Red Hat Linux 9 - i386

    3. Problem description:

    Xpdf is an X Window System based viewer for Portable Document Format
    (PDF) files.

    Martyn Gilmore discovered a flaw in various PDF viewers and readers. An
    attacker can embed malicious external-type hyperlinks that if activated or
    followed by a victim can execute arbitrary shell commands. The Common
    Vulnerabilities and Exposures project (cve.mitre.org) has
    assigned the name CAN-2003-0434 to this issue.

    All users of Xpdf are advised to upgrade to these errata packages, which
    contain a patch to correct this issue.

    4. Solution:

    Before applying this update, make sure all previously released errata
    relevant to your system have been applied.

    To update all RPMs for your particular architecture, run:

    rpm -Fvh [filenames]

    where [filenames] is a list of the RPMs you wish to upgrade. Only those
    RPMs which are currently installed will be updated. Those RPMs which are
    not installed but included in the list will not be updated. Note that you
    can also use wildcards (*.rpm) if your current directory *only* contains the
    desired RPMs.

    Please note that this update is also available via Red Hat Network. Many
    people find this an easier way to apply updates. To use Red Hat Network,
    launch the Red Hat Update Agent with the following command:

    up2date

    This will start an interactive process that will result in the appropriate
    RPMs being upgraded on your system.

    5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

    79680 - xpdf packaging issues

    6. RPMs required:

    Red Hat Linux 7.1:

    SRPMS:
    ftp://updates.redhat.com/7.1/en/os/S...4.71.1.src.rpm

    i386:
    ftp://updates.redhat.com/7.1/en/os/i....71.1.i386.rpm

    Red Hat Linux 7.2:

    SRPMS:
    ftp://updates.redhat.com/7.2/en/os/S...0.92-9.src.rpm

    i386:
    ftp://updates.redhat.com/7.2/en/os/i....92-9.i386.rpm

    ia64:
    ftp://updates.redhat.com/7.2/en/os/i....92-9.ia64.rpm

    Red Hat Linux 7.3:

    SRPMS:
    ftp://updates.redhat.com/7.3/en/os/S...1.00-6.src.rpm

    i386:
    ftp://updates.redhat.com/7.3/en/os/i....00-6.i386.rpm
    ftp://updates.redhat.com/7.3/en/os/i....00-6.i386.rpm
    ftp://updates.redhat.com/7.3/en/os/i....00-6.i386.rpm
    ftp://updates.redhat.com/7.3/en/os/i....00-6.i386.rpm
    ftp://updates.redhat.com/7.3/en/os/i....00-6.i386.rpm

    Red Hat Linux 8.0:

    SRPMS:
    ftp://updates.redhat.com/8.0/en/os/S....01-11.src.rpm

    i386:
    ftp://updates.redhat.com/8.0/en/os/i...01-11.i386.rpm
    ftp://updates.redhat.com/8.0/en/os/i...01-11.i386.rpm
    ftp://updates.redhat.com/8.0/en/os/i...01-11.i386.rpm
    ftp://updates.redhat.com/8.0/en/os/i...01-11.i386.rpm
    ftp://updates.redhat.com/8.0/en/os/i...01-11.i386.rpm

    Red Hat Linux 9:

    SRPMS:
    ftp://updates.redhat.com/9/en/os/SRP...2.01-9.src.rpm

    i386:
    ftp://updates.redhat.com/9/en/os/i38....01-9.i386.rpm
    ftp://updates.redhat.com/9/en/os/i38....01-9.i386.rpm
    ftp://updates.redhat.com/9/en/os/i38....01-9.i386.rpm
    ftp://updates.redhat.com/9/en/os/i38....01-9.i386.rpm
    ftp://updates.redhat.com/9/en/os/i38....01-9.i386.rpm



    7. Verification:

    MD5 sum Package Name
    - --------------------------------------------------------------------------
    a877047ec8229687e1f98bbc8d9eae79 7.1/en/os/SRPMS/xpdf-0.92-4.71.1.src.rpm
    899382588d4da62c16254143bc21790a 7.1/en/os/i386/xpdf-0.92-4.71.1.i386.rpm
    379ce6e345389bfcd896c41b69db7bc6 7.2/en/os/SRPMS/xpdf-0.92-9.src.rpm
    923237d4ec6ba2826880aa3ff9e75d00 7.2/en/os/i386/xpdf-0.92-9.i386.rpm
    2fd06935269238db7f9dce8bd69f9d7a 7.2/en/os/ia64/xpdf-0.92-9.ia64.rpm
    23e863dc6d3c97ed6a7e0de032cab85b 7.3/en/os/SRPMS/xpdf-1.00-6.src.rpm
    e1211ff517f4ff274e3bd8f9c1aa7b80 7.3/en/os/i386/xpdf-1.00-6.i386.rpm
    9cc97a52acf4c57d90b09706829fab6f 7.3/en/os/i386/xpdf-chinese-simplified-1.00-6.i386.rpm
    f83bc371b9a961a9b4ae146a99d419d4 7.3/en/os/i386/xpdf-chinese-traditional-1.00-6.i386.rpm
    6b4c1a27db67fb890aa57573b2797de2 7.3/en/os/i386/xpdf-japanese-1.00-6.i386.rpm
    451b5db7bbf3eaf5d1ed80310003b218 7.3/en/os/i386/xpdf-korean-1.00-6.i386.rpm
    60ceeac34ec52227ccacecc3090113b1 8.0/en/os/SRPMS/xpdf-1.01-11.src.rpm
    bcf272beea15a327e6af0cf9b7c3046f 8.0/en/os/i386/xpdf-1.01-11.i386.rpm
    935390d19d736ec4f40c3a6885387f02 8.0/en/os/i386/xpdf-chinese-simplified-1.01-11.i386.rpm
    9bed417353fcb145c3af81b095ba0731 8.0/en/os/i386/xpdf-chinese-traditional-1.01-11.i386.rpm
    daa07588636f48b39380b8abc5b1c1ff 8.0/en/os/i386/xpdf-japanese-1.01-11.i386.rpm
    a118eff674babd2ac368ffeddbc754c0 8.0/en/os/i386/xpdf-korean-1.01-11.i386.rpm
    38b6753d9e2526820c19deeca0a44fc4 9/en/os/SRPMS/xpdf-2.01-9.src.rpm
    c7a7abec9952797bd086a1c31837a0c9 9/en/os/i386/xpdf-2.01-9.i386.rpm
    a3c888c1e767fab7551267e7bb6ddf77 9/en/os/i386/xpdf-chinese-simplified-2.01-9.i386.rpm
    3973dd1d43dad4ebe9a7dfddb0f1c00d 9/en/os/i386/xpdf-chinese-traditional-2.01-9.i386.rpm
    e2753278a9fd4651d6df773773bcec20 9/en/os/i386/xpdf-japanese-2.01-9.i386.rpm
    446600e313cc13c4c7058d58e15ea794 9/en/os/i386/xpdf-korean-2.01-9.i386.rpm


    These packages are GPG signed by Red Hat for security. Our key is
    available from http://www.redhat.com/security/keys.html

    You can verify each package with the following command:

    rpm --checksig -v

    If you only wish to verify that each package has not been corrupted or
    tampered with, examine only the md5sum with the following command:

    md5sum


    8. References:

    http://lists.netsys.com/pipermail/fu...ne/010397.html
    http://cve.mitre.org/cgi-bin/cvename...=CAN-2003-0434

    9. Contact:

    The Red Hat security contact is . More contact
    details at http://www.redhat.com/solutions/secu...s/contact.html

    Copyright 2003 Red Hat, Inc.
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    iD8DBQE+8KJVXlSAg2UNWIIRAm3mAKCLjKxBNaI0UOZ9K8nHRvTw9mME3gCeNeZS
    iauWXqNk6nFAWUZF5qarvIQ=
    =/hPP
    -----END PGP SIGNATURE-----
    yeah, I\'m gonna need that by friday...

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