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TITLE:
NASM "ppscan()" Off-By-One Vulnerability

SECUNIA ADVISORY ID:
SA30594

VERIFY ADVISORY:
http://secunia.com/advisories/30594/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
NASM (Netwide Assembler) 2.x
http://secunia.com/product/19031/
NASM (Netwide Assembler) 0.x
http://secunia.com/product/4398/

DESCRIPTION:
A vulnerability has been reported in NASM, which potentially can be
exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an off-by-one error within the
"ppscan()" function in preproc.c. This can be exploited to cause a
stack-based buffer overflow with a zero byte by tricking the user
into assembling a specially crafted ASM file.

Successful exploitation may allow execution of arbitrary code.

SOLUTION:
Update to version 2.03.

PROVIDED AND/OR DISCOVERED BY:
Reported by Philipp Thomas in a NASM bug report.

ORIGINAL ADVISORY:
https://sourceforge.net/tracker/?func=detail&atid=106208&aid=1942146&group_id=6208

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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http://secunia.com/about_secunia_advisories/


Please Note:
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Secunia NEVER sends attached files with advisories.
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