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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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2008-07-02
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Popularity:
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4,530 views
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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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Partial Fix
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| Software: | Xen 3.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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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
4) An error exists in the PVFB (Para Virtualized Frame Buffer) functionality while processing screen update requests. This can be exploited to cause a crash or potentially execute arbitrary code in a Dom0 domain.
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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