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Linux Kernel Multiple Vulnerabilities

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Release Date:  2010-09-02    Last Update:  2010-12-08    Views:  3,946

Secunia Advisory SA41263

Where:

Local system

Impact:

Privilege escalation, DoS, Exposure of sensitive information

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), disclose sensitive information, and potentially gain escalated privileges.

1) An error exists within the "keyctl_session_to_parent()" function in security/keys/keyctl.c, which can be exploited to cause a NULL pointer dereference by e.g. calling "keyctl()" with KEYCTL_SESSION_TO_PARENT.

Note: Successful exploitation may require that the distribution does not use pam_keyinit.

2) A use-after-free error exists within the "snd_seq_oss_open()" function in sound/core/seq/oss/seq_oss_init.c, which can be exploited to e.g. cause a kernel crash.

Note: Successful exploitation may require access to the sequencer device.

3) The "mos7720_ioctl()" function in drivers/usb/serial/mos7720.c, the "mos7840_ioctl()" function in drivers/usb/serial/mos7840.c, and the "viafb_ioctl_get_viafb_info()" function in drivers/video/via/ioctl.c are not properly initializing all members of certain structures before copying them to userspace, which can be exploited to disclose kernel stack memory by sending certain IOCTLs.


Solution:
Update to version 2.6.32.23 or 2.6.35.6.

Provided and/or discovered by:
1, 2) Tavis Ormandy
3) Dan Rosenberg

Original Advisory:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.32.23
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.35.6

1) https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-2960
http://www.openwall.com/lists/oss-security/2010/09/02/1
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3d96406c7da1ed5811ea52a3b0905f4f0e295376

2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=27f7ad53829f79e799a253285318bff79ece15bd
http://www.openwall.com/lists/oss-security/2010/09/08/7

3) https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2010-4082
http://www.openwall.com/lists/oss-security/2010/10/25/3
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca

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 Multiple Vulnerabilities

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