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Linux Kernel Local Denial of Service Vulnerabilities
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Secunia Advisory:
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SA23664
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Release Date:
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2007-01-11
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Last Update:
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2007-11-19
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Critical:
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Not critical
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Impact:
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DoS
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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 2.4.x
Linux Kernel 2.6.x
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| | CVE reference: | CVE-2006-4814 (Secunia mirror)
CVE-2006-5823 (Secunia mirror)
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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).
1) An error exists within the handling of locking semaphores in "mincore()". This can be exploited to cause a deadlock by using the function on unmapped pages.
2) An error exists within the "zlib_inflate()" function when processing certain data streams. This can be exploited to corrupt memory by e.g. mounting a specially crafted cramfs image and performing a read operation on the mounted file system.
3) The Kernel fails to handle corrupted data structures in the Ext2 file system correctly. This can be exploited to crash the system by mounting and reading a specially crafted file system image.
The vulnerabilities are reported in versions prior to 2.6.19.2. Vulnerability #2 is also reported in versions prior to 2.4.35.4.
Solution:
Update to version 2.6.19.2 or 2.4.35.4.
Provided and/or discovered by:
1) Doug Chapman
2, 3) LMH
Changelog:
2007-11-19: Added "Linux Kernel 2.4.x" to the list of affected products. Updated "Solution", "Description" and "Original Advisory" sections.
Original Advisory:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.19.2
http://kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.35.4
http://projects.info-pull.com/mokb/MOKB-07-11-2006.html
http://projects.info-pull.com/mokb/MOKB-12-11-2006.html
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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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