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