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TITLE:
Linux Kernel "xfs_acl_from_disk()" Integer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA47488

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/47488/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=47488

RELEASE DATE:
2012-01-11

DISCUSS ADVISORY:
http://secunia.com/advisories/47488/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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http://secunia.com/advisories/47488/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=47488

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DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which
potentially can be exploited by malicious people to compromise a
vulnerable system.

The vulnerability is caused due to an integer overflow within the
"xfs_acl_from_disk()" function (fs/xfs/xfs_acl.c) and can be
exploited to corrupt kernel memory.

Successful exploitation requires physical access to systems that
automatically mount inserted media devices or that a user is tricked
into mounting a malicious filesystem (e.g. USB drives).

SOLUTION:
Fixed in the GIT repository.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Initially disclosed in a GIT commit. Additional information regarding
an incorrect fix provided by Xi Wang.

ORIGINAL ADVISORY:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=093019cf1b18dd31b2c3b77acce4e000e2cbc9ce
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=fa8b18edd752a8b4e9d1ee2cd615b82c93cf8bba

Xi Wang:
http://kqueue.org/blog/2012/01/10/cve-2012-0038-xfs-acl-count-integer-overflow/

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
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