CVE-2013-2105

The Show In Browser (show_in_browser) gem 0.0.3 for Ruby allows local users to inject arbitrary web script or HTML via a symlink attack on /tmp/browser.html.

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://vapid.dhs.org/advisories/show_in_browser.html
• http://www.openwall.com/lists/oss-security/2013/05/18/4
• https://exchange.xforce.ibmcloud.com/vulnerabilities/84378