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"From 2007 to 2009 vulnerabilities in a typical end-user PC almost doubled from about 220 to 420."

Non-Microsoft software to blame for increase in vulnerabilities affecting typical Windows end-users, read more:

http://secunia.com/gfx/pdf/Secunia_Half_Year_Report_2010.pdf


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TITLE:
libvirt iptables Rules and Disk Format Security Bypass

SECUNIA ADVISORY ID:
SA40758

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/40758/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=40758

RELEASE DATE:
2010-07-27

DISCUSS ADVISORY:
http://secunia.com/advisories/40758/#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/40758/

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=40758

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 and some vulnerabilities have been reported in libvirt,
which can be exploited by malicious, local users in a guest system to
bypass certain security restrictions.

1) Some vulnerabilities are caused due to libvirt e.g. incorrectly
probing the disk format 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.

2) The bridge network driver generates potentially insecure iptables
masquerading rules for NAT guests, which may allow access to network
services intended to be restricted.

SOLUTION:
Fixed in the GIT repository.

PROVIDED AND/OR DISCOVERED BY:
1) Red Hat
2) Red Hat credits Jeremy Nickurak

ORIGINAL ADVISORY:
1) http://permalink.gmane.org/gmane.comp.emulators.libvirt/26691
https://bugzilla.redhat.com/show_bug.cgi?id=607810
https://bugzilla.redhat.com/show_bug.cgi?id=607811
https://bugzilla.redhat.com/show_bug.cgi?id=607812
2) https://bugzilla.redhat.com/show_bug.cgi?id=602455

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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