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TITLE:
QEMU Empty VNC Password Authentication Bypass Security Issue

SECUNIA ADVISORY ID:
SA42830

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/42830/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=42830

RELEASE DATE:
2011-02-08

DISCUSS ADVISORY:
http://secunia.com/advisories/42830/#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/42830/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
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https://ca.secunia.com/?page=viewadvisory&vuln_id=42830

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 security issue has been reported in QEMU, which can be exploited by
malicious people to bypass certain security restrictions.

The security issue is caused due to QEMU incorrectly disabling the
authentication if an empty VNC password is set, which can be
exploited to e.g. access the VNC service.

SOLUTION:
Do not set empty VNC passwords.

PROVIDED AND/OR DISCOVERED BY:
Reported in an Ubuntu bug by Neil Wilson.

ORIGINAL ADVISORY:
Ubuntu Bug #697197:
https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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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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Definitions: (Criticality, Where etc.)
http://secunia.com/advisories/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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