Date: Mon, 20 Dec 2004 08:46:24 -0500
From: Luke Macken <lewk@gentoo.org.>
To: gentoo-announce@gentoo.org
Subject: [ GLSA 200412-20 ] NASM: Buffer overflow vulnerability
Cc: bugtraq@securityfocus.com, full-disclosure@lists.netsys.com,
security-alerts@linuxsecurity.com
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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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