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Linux Kernel "mremap()" Missing Return Value Checking Privilege Escalation
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Secunia Advisory:
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SA10897
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Release Date:
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2004-02-18
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Last Update:
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2004-03-02
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Popularity:
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14,954 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| OS: | Linux Kernel 2.2.x
Linux Kernel 2.4.x
Linux Kernel 2.6.x
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| CVE reference: | CVE-2004-0077
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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
An exploit is available.
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
Changelog:
2004-03-02: Updated "Description" section.
Original Advisory:
http://isec.pl/vulnerabilities/isec-0014-mremap-unmap.txt
Other References:
SA10532:
http://secunia.com/advisories/10532/
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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