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Insecure Library Loading
Not critical

Linux Kernel Memory Leak Vulnerabilities

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Release Date:  2010-08-31    Last Update:  2010-10-21    Views:  4,267

Secunia Advisory SA41245

Where:

Local system

Impact:

Exposure of system information, Exposure of sensitive information

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


Some weaknesses and a vulnerability have been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose potentially sensitive information.

1) A vulnerability is caused due to wireless drivers potentially copying more kernel heap memory to userspace than intended, which can be exploited to disclose potentially sensitive information by e.g. sending a specially crafted "SIOCGIWESSID" IOCTL.

2) The "tcf_gact_dump()" function in net/sched/act_gact.c, the "tcf_mirred_dump()" function in net/sched/act_mirred.c, the "tcf_nat_dump()" function in net/sched/act_nat.c, the "tcf_simp_dump()" function in net/sched/act_simple.c, and the "tcf_skbedit_dump()" function in net/sched/act_skbedit.c are not properly initializing all members of certain structures before copying them to userspace, which can be exploited to disclose kernel stack memory.

3) The "tcf_act_police_dump()" function in net/sched/act_police.c is not properly initializing all members of a certain structure before copying it to userspace, which can be exploited to disclose kernel stack memory.


Solution:
Update to version 2.6.36.

Provided and/or discovered by:
1) Reported as a grsecurity bug by jubidu. Additional information provided by Brad Spengler and the vendor.
2) Disclosed in a GIT commit.
3) Jeff Mahoney, SUSE

Original Advisory:
1) Jubidu:
http://forums.grsecurity.net/viewtopic.php?f=3&t=2290&start=0

http://lkml.org/lkml/2010/8/30/127
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=42da2f948d949efd0111309f5827bf0298bcc9a4

2) http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.git;a=commitdiff;h=1c40be12f7d8ca1d387510d39787b12e512a7ce8
3) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=0f04cfd098fb81fded74e78ea1a1b86cc6c6c31e

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 Memory Leak Vulnerabilities

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