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Insecure Library Loading
Not critical

Linux Kernel Denial of Service Vulnerabilities

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Release Date:  2011-03-04    Last Update:  2011-04-13    Views:  3,392

Secunia Advisory SA43594

Where:

Local system

Impact:

DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

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) A NULL pointer dereference error when reading a DNS resolver key instantiated with an error indication can be exploited to crash the kernel.

2) The "__nfs4_proc_set_acl()" function in fs/nfs/nfs4proc.c incorrectly uses slab memory, which can be exploited to trigger a sanity check when trying to free the memory in subsequent functions via e.g. a setacl operation exceeding a page of data.

3) An error within the "br_multicast_add_group()" function in net/bridge/br_multicast.c can be exploited to corrupt a list, which can lead to e.g. a memory corruption by sending certain IGMP packets.

Successful exploitation of this vulnerability requires that the kernel is compiled with the "BRIDGE_IGMP_SNOOPING" option.


Solution:
Update to version 2.6.38.

Provided and/or discovered by:
Disclosed in a GIT commit.

Original Advisory:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1362fa078dae16776cd439791c6605b224ea6171
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e9e3d724e2145f5039b423c290ce2b2c3d8f94bc
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6b0d6a9b4296fa16a28d10d416db7a770fc03287

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel Denial of Service Vulnerabilities

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