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Linux Kernel SACF Instruction and tmpfs Vulnerabilities
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Secunia Advisory:
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SA13654
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Release Date:
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2004-12-27
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Last Update:
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2006-03-13
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Popularity:
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9,555 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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 2.6.x
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| CVE reference: | CVE-2004-0887
CVE-2004-2302
CVE-2005-0977
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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) or gain escalated privileges.
1) The SACF (Set Address Space Control Fast) control instruction is handled insecurely on the S/390 platform allowing execution of arbitrary code with root privileges.
2) An input validation error in the "shmem_nopage()" function in the tmpfs file system can be exploited to crash the system.
3) A race condition in "sysfs_read_file()" and "sysfs_write_file()" functions in "/fs/sysfs/file.c" may be exploited to read kernel memory and cause a crash via large offsets in sysfs files.
4) A memory leak error in the handling of files that were opened with the O_DIRECT flag can potentially be exploited to exhaust all available kernel memory by repeatedly opening files in a certain way.
Solution:
Update to version 2.6.10.
http://kernel.org/
Provided and/or discovered by:
1) Martin Schwidefsky
2) Hugh Dickins
Changelog:
2005-04-20: Added information about additional vulnerability.
2005-12-01: Added information about additional vulnerability.
2006-03-13: Added information about additional vulnerability.
Original Advisory:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.10
http://linux.bkbits.net:8080/linux-2.6/cset%404182a613oVsK0-8eCWpyYFrUf8rhLA
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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