Phusion Passenger 4.0.37 allows local users to write to certain files and directories via a symlink attack on (1) control_process.pid or a (2) generation-* file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-1831.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-1832
• phusion/passenger@9442805
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=736958
• https://bugzilla.redhat.com/show_bug.cgi?id=1058992
• GHSA-qw8w-2xcp-xg59
• http://lists.fedoraproject.org/pipermail/package-announce/2015-February/149032.html
• http://openwall.com/lists/oss-security/2014/01/29/6
• http://openwall.com/lists/oss-security/2014/01/30/3
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/passenger/CVE-2014-1832.yml