Secunia Security Advisory - 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.
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TITLE:
libvirt iptables Rules and Disk Format Security Bypass
SECUNIA ADVISORY ID:
SA40758
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http://secunia.com/advisories/40758/
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RELEASE DATE:
2010-07-27
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http://secunia.com/advisories/40758/#comments
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http://secunia.com/advisories/40758/
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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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