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Linux Kernel Security Bypass and Multiple Denial of Service Vulnerabilities
Secunia Advisory: SA25955
Release Date: 2007-07-09
Last Update: 2008-07-21
Popularity: 10,782 views

Critical:
Moderately critical
Impact: Security Bypass
DoS
Where: From remote
Solution Status: Vendor Patch

OS:Linux Kernel 2.6.x

Secunia CVSS-2 Score: Available in Secunia business solutions

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Advisory Content (Page 1 of 3)[ 1 ] [ 2 ] [ 3 ]

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.

Change Page:
[ 1 ] [ 2 ] [ 3 ]



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