Secunia Security Advisory - Ben Hawkes has reported some vulnerabilities in the Linux Kernel, which can be exploited by malicious, local users to gain escalated privileges.
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TITLE:
Linux Kernel Privilege Escalation Vulnerabilities
SECUNIA ADVISORY ID:
SA41462
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RELEASE DATE:
2010-09-15
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DESCRIPTION:
Ben Hawkes has reported some vulnerabilities in the Linux Kernel,
which can be exploited by malicious, local users to gain escalated
privileges.
1) Certain callers of the "compat_alloc_user_space()" function (e.g.
the "compat_mc_getsockopt()" function in net/compat.c) do not perform
any verification of the returned memory area, which can be exploited
to cause a kernel memory corruption.
2) The 32bit system call emulation layer does not properly ensure
that the requested system call is in the system call table, which can
be exploited to execute arbitrary code with kernel privileges.
This is related to:
SA26934
Successful exploitation requires 64bit systems.
SOLUTION:
Fixed in the GIT repository.
PROVIDED AND/OR DISCOVERED BY:
Ben Hawkes
ORIGINAL ADVISORY:
1) http://sota.gen.nz/compat1/
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c41d68a513c71e35a14f66d71782d27a79a81ea6
2) http://sota.gen.nz/compat2/
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=36d001c70d8a0144ac1d038f6876c484849a74de
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=eefdca043e8391dcd719711716492063030b55ac
OTHER REFERENCES:
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EXTENDED DESCRIPTION:
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EXTENDED SOLUTION:
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EXPLOIT:
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