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[ GLSA 200412-20 ] NASM: Buffer overflow vulnerability
From: Luke Macken <lewk () gentoo org>
Date: Mon, 20 Dec 2004 08:46:24 -0500

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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

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