CVE-2011-4363

ProcessTable.pm in the Proc::ProcessTable module 0.45 for Perl, when TTY information caching is enabled, allows local users to overwrite arbitrary files via a symlink attack on /tmp/TTYDEVS.

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=650500
• http://secunia.com/advisories/47015
• http://www.openwall.com/lists/oss-security/2011/11/30/2
• http://www.openwall.com/lists/oss-security/2011/11/30/3
• http://www.osvdb.org/77428
• http://www.securityfocus.com/bid/50868
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2011-4363
• https://rt.cpan.org/Public/Bug/Display.html?id=72862