CVE-2007-3919

(1) xenbaked and (2) xenmon.py in Xen 3.1 and earlier allow local users to truncate arbitrary files via a symlink attack on /tmp/xenq-shm.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=447795
• http://osvdb.org/41342
• http://osvdb.org/41343
• http://secunia.com/advisories/27389
• http://secunia.com/advisories/27408
• http://secunia.com/advisories/27486
• http://secunia.com/advisories/27497
• http://secunia.com/advisories/29963
• http://www.debian.org/security/2007/dsa-1395
• http://www.mandriva.com/security/advisories?name=MDKSA-2007:203
• http://www.redhat.com/support/errata/RHSA-2008-0194.html
• http://www.securityfocus.com/bid/26190
• http://www.securitytracker.com/id?1018859
• http://www.vupen.com/english/advisories/2007/3621
• https://exchange.xforce.ibmcloud.com/vulnerabilities/37403
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9913
• https://www.redhat.com/archives/fedora-package-announce/2007-November/msg00004.html
• https://www.redhat.com/archives/fedora-package-announce/2007-November/msg00075.html