The extlib gem 0.9.15 and earlier for Ruby does not properly restrict casts of string values, which might allow remote attackers to conduct object-injection attacks and execute arbitrary code, or cause a denial of service (memory and CPU consumption) by leveraging Action Pack support for (1) YAML type conversion or (2) Symbol type conversion, a similar vulnerability to CVE-2013-0156.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-1802
• https://bugzilla.redhat.com/show_bug.cgi?id=917233
• datamapper/extlib@b4f9817...4540e71
• http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00002.html
• https://web.archive.org/web/20130203232028/https://support.cloud.engineyard.com/entries/22915701-january-14-2013-security-vulnerabilities-httparty-extlib-crack-nori-update-these-gems-immediately
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/extlib/CVE-2013-1802.yml