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Xen Multiple Vulnerabilities
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Secunia Advisory:
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SA28405
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Release Date:
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2008-01-10
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Last Update:
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2008-02-29
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Critical:
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Not critical
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Impact:
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Security Bypass
DoS
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Where:
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Local system
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Solution Status:
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Unpatched
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| Software: | Xen 3.x
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| | CVE reference: | CVE-2007-5906 (Secunia mirror)
CVE-2007-5907 (Secunia mirror)
CVE-2008-0928 (Secunia mirror)
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This advisory is currently marked as unpatched!
- Companies can be alerted when a patch is released! |
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Description:
Some vulnerabilities have been reported in Xen, which can be exploited by malicious, local users to cause a DoS (Denial of Service) or bypass certain security restrictions.
1) An error within the handling of the DR7 debug register can be exploited out of a guest system to crash the hypervisor by setting certain breakpoints.
Successful exploitation may require that a HVM hypervisor is used.
2) Access to the CR4 register is not properly checked. This can be exploited out of a guest system to e.g. crash DomU or Dom0 domains.
Successful exploitation may require that a paravirtualised kernel is used.
3) The ioemu block device backends do not properly check a HVM guest's read or write attempts, which can be exploited out of a HVM guest system to e.g. crash Xen or potentially escape the virtualisation jail by writing into arbitrary Dom0 memory.
Note: Successful exploitation requires privileges to send specially crafted read or write requests to the ioemu block device driver backends.
This is related to vulnerability #7 in:
SA25073
Solution:
Restrict access to trusted users only.
Provided and/or discovered by:
1, 2) Reported by Jan Beulich.
3) Ian Jackson
Changelog:
2008-02-26: Added vulnerability #3.
2008-02-29: Added CVE reference.
Original Advisory:
1) http://lists.xensource.com/archives/html/xen-devel/2007-10/msg01048.html
2) http://lists.xensource.com/archives/html/xen-devel/2007-10/msg00932.html
3) http://lists.xensource.com/archives/html/xen-devel/2008-02/msg00610.html
Other References:
SA25073:
http://secunia.com/advisories/25073/
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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4 Related Secunia Security Advisories
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1. Xen PAL Emulation "copy_to_user()" Security Bypass
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2. Xen "mov_to_rr" Security Bypass Vulnerability
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3. Xen "xenbaked" Insecure Temporary Files
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4. Xen Multiple Vulnerabilities
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