From: Secunia Security Advisories (sec-advsecunia.com)
Date: Wed Feb 18 2004 - 09:01:34 CST

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TITLE:
Linux Kernel "mremap()" Missing Return Value Checking Privilege
Escalation

SECUNIA ADVISORY ID:
SA10897

VERIFY ADVISORY:
http://secunia.com/advisories/10897/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.2.x
Linux Kernel 2.4.x
Linux Kernel 2.6.x

DESCRIPTION:
Paul Starzetz has reported a vulnerability in the Linux kernel, which
can be exploited by malicious, local users to gain escalated
privileges on a vulnerable system.

The problem is that the "mremap()" system call doesn't check values
returned by the "do_munmap()" kernel function when moving VMAs
(Virtual Memory Areas) or parts thereof.

Successful exploitation allows execution of arbitrary code with
kernel level privileges.

The following versions are reportedly affected:
* Branch 2.2.x up to 2.2.25
* Branch 2.4.x up to 2.4.24
* Branch 2.6.x up to 2.6.2

Exploit code has reportedly been developed and will be released next
week.

NOTE: This is not the same vulnerability as the one reported early
January 2004 in the same system call.

SOLUTION:
Update to a non-vulnerable version.
http://www.kernel.org/

Grant only trusted users access to an affected system.

PROVIDED AND/OR DISCOVERED BY:
Paul Starzetz

ORIGINAL ADVISORY:
http://isec.pl/vulnerabilities/isec-0014-mremap-unmap.txt

OTHER REFERENCES:
SA10532:
http://secunia.com/advisories/10532/

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