Security Advisory SA32064 - Xen XenStore Domain Backend Configuration Weakness

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Secunia Advisory SA32064

Xen XenStore Domain Backend Configuration Weakness

Secunia Advisory

SA32064

Release Date

2008-10-01

Last Update

2009-01-07

Popularity

5,588 views

Comments

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Criticality level

Not critical

Impact

Security Bypass

Where

Local system

Authentication level

This information is available to Secunia VIM customers

Report reliability

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Solution Status

Vendor Workaround

Systems affected

This information is available to Secunia VIM customers

Approve distribution

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Software:

Xen 3.x

Secunia CVSS Score

This information is available to Secunia VIM Customers

CVE Reference(s)

CVE-2008-4405 CVSS score available to Secunia VIM customers
CVE-2008-5716 CVSS score available to Secunia VIM customers

Description

A weakness has been reported in Xen, which can be exploited by malicious, local users in a Xen DomU to bypass certain security restrictions.

The weakness is caused due to certain XenStore variables (e.g. /local/domain/<domid>/console/tty and /local/domain/<domid>/console/vnc-port) being writable from within the corresponding Xen DomU domain. This can be exploited to overwrite the variables, which may be processed with potentially unsafe values in applications running in Dom0.

Solution
Fixed in the Mercurial repository.

Provided and/or discovered by
Pascal Bouchareine

Changelog
Further details available to Secunia VIM customers

Original Advisory
http://lists.xensource.com/archives/html/xen-devel/2008-09/msg00992.html
https://bugzilla.redhat.com/show_bug.cgi?id=464818

Deep Links
Links available to Secunia VIM customers

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Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Xen XenStore Domain Backend Configuration Weakness

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Secunia Advisory SA32064

Xen XenStore Domain Backend Configuration Weakness

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