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Linux Kernel Security Bypass and Multiple Denial of Service Vulnerabilities
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Secunia Advisory:
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SA25955
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Release Date:
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2007-07-09
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Last Update:
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2008-07-21
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Popularity:
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9,132 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
DoS
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Where:
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From remote
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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-2007-3107
CVE-2007-3642
CVE-2008-2931
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Description:
Some vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to bypass certain security restrictions and cause a DoS (Denial of Service), and malicious people to cause a DoS.
1) An error within the "decode_choice()" function in net/netfilter/bf_conntrack_h323_asn1.c when handling choices that are still encoded in the fixed-size bitfield can be exploited to cause access to undefined types, resulting in a crash.
2) MSR bits are cleared after copying the state into the thread_struct. This can be exploited to cause corruption of the floating point state after returning from signal handlers, resulting in a DoS.
Successful exploitation requires a PowerPC based architecture.
3) The "do_change_type()" function in fs/namespace.c does not properly check for "CAP_SYS_ADMIN" privileges before performing certain operations. This can be exploited to e.g. mark private mounts as shared or mark a mount as unbindable.
Solution:
Update to version 2.6.22.
Vulnerability #1 is also fixed in versions 2.6.21.6 and 2.6.20.15.
Provided and/or discovered by:
1) Zhongling Wen
2) Reported by the vendor
3) Reported in a Red Hat bug.
Changelog:
2007-07-10: Updated "Solution" section. Added vulnerability #2.
2007-07-11: Added CVE reference.
2008-07-21: Updated advisory to include vulnerability #3. Added CVE reference.
Original Advisory:
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.22
3) https://bugzilla.redhat.com/show_bug.cgi?id=454388
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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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10th Oct, 2008
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