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Vulnerability Summary for CVE-2008-5716

Original release date:12/24/2008
Last revised:01/06/2009
Source: US-CERT/NIST

Overview

xend in Xen 3.3.0 does not properly restrict a guest VM's write access within the /local/domain xenstore directory tree, which allows guest OS users to cause a denial of service and possibly have unspecified other impact by writing to (1) console/tty, (2) console/limit, or (3) image/device-model-pid. NOTE: this issue exists because of erroneous set_permissions calls in the fix for CVE-2008-4405.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score:7.2 (HIGH) (AV:L/AC:L/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore: 10.0
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type:Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (01/07/2009)
Not vulnerable. This issue did not affect the versions of Xen as shipped with Red Hat Enterprise Linux 5. Security update released to address CVE-2008-4405 - https://rhn.redhat.com/errata/RHSA-2009-0003.html - contained correct patch which did not introduce this problem and resolved the original issue.

References to Advisories, Solutions, and Tools

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External Source: XF
Name: xen-xend-xenstore-dos(47668)
Hyperlink:http://xforce.iss.net/xforce/xfdb/47668
External Source: BID
Name: 31499
Hyperlink:http://www.securityfocus.com/bid/31499
External Source: MLIST
Name: [oss-security] 20081219 CVE Request -- Xen (Upstream patch for CVE-2008-4405 is incomplete)
Hyperlink:http://openwall.com/lists/oss-security/2008/12/19/1
External Source: MLIST
Name: [xen-devel] 20081218 Re: PATCH: Actually make /local/domain/$DOMID readonly to the guest
Hyperlink:http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00847.html
External Source: MLIST
Name: [xen-devel] 20081218 Re: PATCH: Actually make /local/domain/$DOMID readonly to the guest
Hyperlink:http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00846.html
External Source: MLIST
Name: [xen-devel] 20081218 Re: PATCH: Actually make /local/domain/$DOMID readonly to the guest
Hyperlink:http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00845.html
External Source: MLIST
Name: [xen-devel] 20081218 PATCH: Actually make /local/domain/$DOMID readonly to the guest
Hyperlink:http://lists.xensource.com/archives/html/xen-devel/2008-12/msg00842.html

Vulnerable software and versions

Nav control imageConfiguration 1
spacerNav control imageOR
spacerspacerNav control image* cpe:/a:citrix:xen:3.3.0
* Denotes Vulnerable Software
* Changes related to vulnerability configurations

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)
CVE Standard Vulnerability Entry:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5716