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TITLE:
NASM "ieee_putascii()" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA15352

VERIFY ADVISORY:
http://secunia.com/advisories/15352/

CRITICAL:
Less critical

IMPACT:
System access

WHERE:
>From remote

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

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

The vulnerability is caused due to a boundary error in the
"ieee_putascii()" function and can be exploited to cause a buffer
overflow by tricking a user into assembling a specially crafted ASM
file.

Successful exploitation allows execution of arbitrary code with the
privileges of the user running NASM.

The vulnerability has been reported in versions 0.98.38 and 0.98.39.
Other versions may also be affected.

SOLUTION:
Don't assemble untrusted ASM files.

PROVIDED AND/OR DISCOVERED BY:
Jindrich Novy

ORIGINAL ADVISORY:
http://sourceforge.net/mailarchive/forum.php?thread_id=7175315&forum_id=4978

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