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TITLE:
Qemu "scsi_disk_emulate_command()" Denial of Service Weakness

SECUNIA ADVISORY ID:
SA45886

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/45886/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=45886

RELEASE DATE:
2011-09-09

DISCUSS ADVISORY:
http://secunia.com/advisories/45886/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/45886/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=45886

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A weakness has been reported in Qemu, which can be exploited by
malicious, local users in a guest virtual machine to cause a DoS
(Denial of Service).

The weakness is caused due to a boundary error within the
"scsi_disk_emulate_command()" function (hw/scsi-disk.c) of the SCSI
subsystem and can be exploited to cause a buffer overflow and crash a
guest by e.g. sending a specially crafted "READ CAPACITY" command.

SOLUTION:
Restrict access to trusted users.

PROVIDED AND/OR DISCOVERED BY:
Red Hat credits Paolo Bonzini.

ORIGINAL ADVISORY:
Red Hat bug #736038:
https://bugzilla.redhat.com/show_bug.cgi?id=736038

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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