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QEMU Disk Format Security Bypass

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Release Date:  2008-05-08    Last Update:  2008-08-15    Views:  8,720

Secunia Advisory SA30111

Where:

Local system

Impact:

Security Bypass

Solution Status:

Vendor Workaround

Software:

CVE Reference(s):

Description


Some vulnerabilities have been reported in QEMU, which can be exploited by malicious, local users to bypass certain security restrictions.

The vulnerabilities are caused due to the "drive_init()" function in vl.c and "do_change_block()" function in monitor.c determining the format of a disk from data contained in the disk's header. This can be exploited by a malicious user in a guest system to e.g. read arbitrary files on the host by writing a fake header to a raw formatted disk image.

The vulnerabilities are reported in version 0.9.1. Other versions may also be affected.


Solution:
Fixed in the SVN repository.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits Avi Kivity. Additional information provided by Mandriva.

Original Advisory:
http://lists.gnu.org/archive/html/qemu-devel/2008-04/msg00675.html

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: QEMU Disk Format Security Bypass

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