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TITLE:
Linux Kernel "vmsplice()" System Call Vulnerabilities

SECUNIA ADVISORY ID:
SA28835

VERIFY ADVISORY:
http://secunia.com/advisories/28835/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, Privilege escalation, DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

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), disclose potentially sensitive information, and gain
escalated privileges.

The vulnerabilities are caused due to the missing verification of
parameters within the "vmsplice_to_user()",
"copy_from_user_mmap_sem()", and "get_iovec_page_array()" functions
in fs/splice.c before using them to perform certain memory
operations. This can be exploited to e.g. read or write to arbitrary
kernel memory via a specially crafted "vmsplice()" system call.

Successful exploitation allows attackers to e.g. gain "root"
privileges.

Note: The affected system call first appeared in version 2.6.17.

SOLUTION:
Update to version 2.6.23.16 or 2.6.24.2.

PROVIDED AND/OR DISCOVERED BY:
Wojciech Purczynskiof iSEC Security Research and qaaz

ORIGINAL ADVISORY:
iSEC Security Research:
http://www.isec.pl/vulnerabilities/isec-0026-vmsplice_to_kernel.txt

qaaz:
http://milw0rm.com/exploits/5092
http://milw0rm.com/exploits/5093

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About:
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