CVE-2014-4038

ppc64-diag 2.6.1 allows local users to overwrite arbitrary files via a symlink attack related to (1) rtas_errd/diag_support.c and /tmp/get_dt_files, (2) scripts/ppc64_diag_mkrsrc and /tmp/diagSEsnap/snapH.tar.gz, or (3) lpd/test/lpd_ela_test.sh and /var/tmp/ras.

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://lists.opensuse.org/opensuse-security-announce/2014-07/msg00018.html
• http://openwall.com/lists/oss-security/2014/06/17/1
• http://rhn.redhat.com/errata/RHSA-2015-0383.html
• http://rhn.redhat.com/errata/RHSA-2015-1320.html
• http://secunia.com/advisories/60616
• http://www.securityfocus.com/bid/68049
• https://bugzilla.novell.com/show_bug.cgi?id=882667
• https://bugzilla.redhat.com/show_bug.cgi?id=1109371