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TITLE:
Linux Kernel "load_mixer_volumes()" Vulnerabilities

SECUNIA ADVISORY ID:
SA42765

VERIFY ADVISORY:
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http://secunia.com/advisories/42765/
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https://ca.secunia.com/?page=viewadvisory&vuln_id=42765

RELEASE DATE:
2010-12-31

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http://secunia.com/advisories/42765/#comments

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DESCRIPTION:
Dan Rosenberg has reported two vulnerabilities in the Linux Kernel,
which can be exploited by malicious, local users to disclose certain
system information and potentially gain escalated privileges.

1) A boundary error within the "load_mixer_volumes()" function in
sound/oss/soundcard.c can be exploited to cause a buffer overflow and
e.g. potentially execute arbitrary code in kernel mode by sending a
specially crafted SOUND_MIXER_SETLEVELS IOCTL.

2) An error within the "load_mixer_volumes()" function in
sound/oss/soundcard.c can be exploited to disclose certain kernel
memory by sending a specially crafted SOUND_MIXER_SETLEVELS IOCTL.

Successful exploitation requires that OSS is used and the attacker
has write access to a vulnerable audio device (e.g. is member of the
"audio" group).

SOLUTION:
Fixed in Takashi Iwai's "Sound development tree" GIT repository.

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PROVIDED AND/OR DISCOVERED BY:
Dan Rosenberg

ORIGINAL ADVISORY:
Dan Rosenberg:
http://www.openwall.com/lists/oss-security/2010/12/31/1

GIT commit:
http://git.kernel.org/?p=linux/kernel/git/tiwai/sound-2.6.git;a=commitdiff;h=d81a12bc29ae4038770e05dce4ab7f26fd5880fb

OTHER REFERENCES:
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DEEP LINKS:
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EXTENDED DESCRIPTION:
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EXTENDED SOLUTION:
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EXPLOIT:
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http://secunia.com/products/corporate/EVM/

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