CVE-2014-4996

lib/vlad/dba/mysql.rb in the VladTheEnterprising gem 0.2 for Ruby allows local users to write to arbitrary files via a symlink attack on /tmp/my.cnf.#{target_host}.

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://www.openwall.com/lists/oss-security/2014/07/07/14
• http://www.openwall.com/lists/oss-security/2014/07/17/5
• http://www.securityfocus.com/bid/68731
• http://www.vapid.dhs.org/advisories/VladTheEnterprising-0.2.html
• https://exchange.xforce.ibmcloud.com/vulnerabilities/94744
• http://www.openwall.com/lists/oss-security/2014/07/07/14
• http://www.openwall.com/lists/oss-security/2014/07/17/5
• http://www.securityfocus.com/bid/68731
• http://www.vapid.dhs.org/advisories/VladTheEnterprising-0.2.html
• https://exchange.xforce.ibmcloud.com/vulnerabilities/94744