CVE-2008-4993

qemu-dm.debug in Xen 3.2.1 allows local users to overwrite arbitrary files via a symlink attack on the /tmp/args temporary file.

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/496367
• http://dev.gentoo.org/~rbu/security/debiantemp/xen-utils-3.2-1
• http://www.mandriva.com/security/advisories?name=MDVSA-2009:016
• http://www.openwall.com/lists/oss-security/2008/10/30/2
• http://www.redhat.com/support/errata/RHSA-2009-0003.html
• https://bugs.gentoo.org/show_bug.cgi?id=235770
• https://bugs.gentoo.org/show_bug.cgi?id=235805
• https://exchange.xforce.ibmcloud.com/vulnerabilities/46545
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9576
• http://bugs.debian.org/496367
• http://dev.gentoo.org/~rbu/security/debiantemp/xen-utils-3.2-1
• http://www.mandriva.com/security/advisories?name=MDVSA-2009:016
• http://www.openwall.com/lists/oss-security/2008/10/30/2
• http://www.redhat.com/support/errata/RHSA-2009-0003.html
• https://bugs.gentoo.org/show_bug.cgi?id=235770
• https://bugs.gentoo.org/show_bug.cgi?id=235805
• https://exchange.xforce.ibmcloud.com/vulnerabilities/46545
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9576