CVE-2014-4150

The scheme48-send-definition function in cmuscheme48.el in Scheme 48 allows local users to write to arbitrary files via a symlink attack on /tmp/s48lose.tmp.

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/2014/06/13/5
• http://www.s48.org/cgi-bin/hgwebdir.cgi/s48/rev/a44624256297
• http://www.securityfocus.com/bid/67654
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=748766