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Linux Kernel Ext4 Multiple Vulnerabilities

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Release Date:  2009-12-10    Last Update:  2009-12-16    Views:  6,665

Secunia Advisory SA37658

Where:

Local system

Impact:

Privilege escalation, 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) or gain escalated privileges.

1) A vulnerability is caused due to insufficient access checks when processing the "EXT4_IOC_MOVE_EXT" IOCTL, which can be exploited to overwrite files with root privileges by sending a specially crafted IOCTL.

2) An error within the "ext4_fill_flex_info()" function in fs/ext4/super.c can be exploited to cause a division by zero by mounting a specially crafted filesystem.

3) An error within the "ext4_decode_error()" function in fs/ext4/super.c can be exploited to cause a NULL pointer dereference by mounting a specially crafted filesystem.


Solution:
Update to version 2.6.31.8 and 2.6.32.1.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1, 3) Disclosed in a GIT commit.
2) Nageswara R Sastry

Original Advisory:
1) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4a58579b9e4e2a35d57e6c9c8483e52f6f1b7fd6
2) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=503358ae01b70ce6909d19dd01287093f6b6271c
http://bugzilla.kernel.org/show_bug.cgi?id=14287
3) http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=78f1ddbb498283c2445c11b0dfa666424c301803

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 Ext4 Multiple Vulnerabilities

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