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TITLE:
NetBSD Audio Drivers ioctl Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA15874

VERIFY ADVISORY:
http://secunia.com/advisories/15874/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
NetBSD 1.x
http://secunia.com/product/255/

DESCRIPTION:
A vulnerability has been reported in NetBSD, which can be exploited
by malicious, local users to cause a DoS (Denial of Service).

The vulnerability is caused due to a division by zero error in
certain audio drivers when processing an "ioctl()" call that contains
both the "unpaused" command and the block-size change information.

Successful exploitation crashes the kernel, but requires access to
the audio device.

The vulnerability has been reported in the "clcs" and "emuxki"
drivers for the Cirrus Logic CS4280/CS4281, SB Live!, and SB PC 512
hardware.

SOLUTION:
The vulnerability has been fixed in the following versions:
* NetBSD-current (June 12, 2005)
* NetBSD-1.6 branch (June 17, 2005, 1.6.3 will include the fix)

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Ignatios Souvatzis and Yamamoto Takashi.

ORIGINAL ADVISORY:
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2005-002.txt.asc

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