The diff_pp function in lib/gauntlet_rubyparser.rb in the ruby_parser gem 3.1.1 and earlier for Ruby allows local users to overwrite arbitrary files via a symlink attack on a temporary file with a predictable name in /tmp.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-0162
• https://bugzilla.redhat.com/show_bug.cgi?id=892806
• http://rhn.redhat.com/errata/RHSA-2013-0544.html
• http://rhn.redhat.com/errata/RHSA-2013-0548.html
• seattlerb/ruby_parser@506c7e1
• seattlerb/ruby_parser@c35acd8
• https://access.redhat.com/errata/RHSA-2013:0544
• https://access.redhat.com/errata/RHSA-2013:0582
• https://access.redhat.com/security/cve/CVE-2013-0162
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/ruby_parser/CVE-2013-0162.yml