Bug 667615 - (CVE-2010-4527) CVE-2010-4527 kernel: buffer overflow in OSS load_mixer_volumes
CVE-2010-4527 kernel: buffer overflow in OSS load_mixer_volumes
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
public=20101229,reported=20110105,sou...
: Security
Depends On: 667616 667617 667618 667619
Blocks:
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Reported: 2011-01-06 04:23 EST by Eugene Teo (Security Response)
Modified: 2015-08-19 05:02 EDT (History)
11 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-06-05 14:59:09 EDT
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Description Eugene Teo (Security Response) 2011-01-06 04:23:49 EST
"The load_mixer_volumes() function, which can be triggered by unprivileged users via the SOUND_MIXER_SETLEVELS ioctl, is vulnerable to a buffer overflow.  Because the provided 'name' argument isn't guaranteed to be NULL terminated at the expected 32 bytes, it's possible to overflow past the end of the last element in the mixer_vols array.  Further exploitation can result in an arbitrary kernel write (via subsequent calls to load_mixer_volumes()) leading to privilege escalation, or arbitrary kernel reads via get_mixer_levels().  In addition, the strcmp() may leak bytes beyond the mixer_vols array.

This only affects users who are using OSS (not to be confused with the OSS emulation provided by ALSA), and requires access to a device file normally restricted to users in group audio."

http://seclists.org/oss-sec/2010/q4/377

Upstream commit:
http://git.kernel.org/linus/d81a12bc29ae4038770e05dce4ab7f26fd5880fb

Acknowledgements:

Red Hat would like to thank Dan Rosenberg for reporting this issue.
Comment 2 Eugene Teo (Security Response) 2011-01-11 04:33:35 EST
Statement:

Not vulnerable. This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, 6 and Red Hat Enterprise MRG as they did not provide support for Open Sound System (OSS).

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