[Full-Disclosure] [ GLSA 200412-20 ] NASM: Buffer overflow vulnerability

From: Luke Macken (lewk_at_gentoo.org)
Date: 12/20/04

  • Next message: Sune Kloppenborg Jeppesen: "[Full-Disclosure] [ GLSA 200412-17 ] kfax: Multiple overflows in the included TIFF library" 
    Date: Mon, 20 Dec 2004 08:46:24 -0500
To: gentoo-announce@gentoo.org

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    Gentoo Linux Security Advisory GLSA 200412-20
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: NASM: Buffer overflow vulnerability
          Date: December 20, 2004
          Bugs: #74477
            ID: 200412-20

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    Synopsis
    ========

    NASM is vulnerable to a buffer overflow that allows an attacker to
    execute arbitrary code through the use of a malicious object file.

    Background
    ==========

    NASM is a 80x86 assembler that has been created for portability and
    modularity. NASM supports Pentium, P6, SSE MMX, and 3DNow extensions.
    It also supports a wide range of objects formats (ELF, a.out, COFF,
    ...), and has its own disassembler.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 dev-lang/nasm <= 0.98.38 >= 0.98.38-r1

    Description
    ===========

    Jonathan Rockway discovered that NASM-0.98.38 has an unprotected
    vsprintf() to an array in preproc.c. This code vulnerability may lead
    to a buffer overflow and potential execution of arbitrary code.

    Impact
    ======

    A remote attacker could craft a malicious object file which, when
    supplied in NASM, would result in the execution of arbitrary code with
    the rights of the user running NASM.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All NASM users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=dev-lang/nasm-0.98.38-r1"

    References
    ==========

      [ 1 ] Original Advisory
            http://sourceforge.net/mailarchive/forum.php?thread_id=6166881&forum_id=4978

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200412-20.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2004 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/2.0

    _______________________________________________
    Full-Disclosure - We believe in it.
    Charter: http://lists.netsys.com/full-disclosure-charter.html

  • Next message: Sune Kloppenborg Jeppesen: "[Full-Disclosure] [ GLSA 200412-17 ] kfax: Multiple overflows in the included TIFF library"

    Relevant Pages

    • [ GLSA 200412-20 ] NASM: Buffer overflow vulnerability
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