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TITLE:
Linux Kernel Denial of Service and Privilege Escalation
Vulnerabilities

SECUNIA ADVISORY ID:
SA44248

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/44248/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=44248

RELEASE DATE:
2011-04-23

DISCUSS ADVISORY:
http://secunia.com/advisories/44248/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/44248/

ONLY AVAILABLE IN CUSTOMER AREA:
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 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=44248

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Some vulnerabilities have been reported in the Linux Kernel, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.

1) Integer overflow errors within the "agp_generic_insert_memory()"
and "agp_generic_remove_memory()" function in
drivers/char/agp/generic.c can be exploited to cause a buffer
overflow via e.g. specially crafted AGPIOC_BIND and AGPIOC_UNBIND
IOCTLs.

2) The implementation of the AGPIOC_RESERVE and AGPIOC_ALLOCATE
IOCTLs does not properly handle and track memory allocations, which
can be exploited to cause an OOM (Out Of Memory) situation.

Successful exploitation requires access to the  "/dev/agpgart" device
(usually group "video").

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Vasiliy Kulikov

ORIGINAL ADVISORY:
https://lkml.org/lkml/2011/4/14/293
https://lkml.org/lkml/2011/4/14/294

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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