Joined: 25 Feb 2003
Location: Essen, Germany
|Posted: Mon Dec 20, 2004 1:59 pm Post subject: [ GLSA 200412-20 ] NASM: Buffer overflow vulnerability
|Gentoo Linux Security Advisory
Title: NASM: Buffer overflow vulnerability (GLSA 200412-20)
Date: December 20, 2004
NASM is vulnerable to a buffer overflow that allows an attacker to execute arbitrary code through the use of a malicious object file.
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.
Vulnerable: <= 0.98.38
Unaffected: >= 0.98.38-r1
Architectures: All supported architectures
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.
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.
There is no known workaround at this time.
All NASM users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=dev-lang/nasm-0.98.38-r1"
Last edited by GLSA on Sun May 07, 2006 4:54 pm; edited 1 time in total