Effective 2019 Sep 15, Cisco will no longer publish non-Cisco product alerts. Cisco will continue to publish Security Advisories to address third-party software vulnerabilities per the Cisco Security Vulnerability Policy.
Multivendor Vulnerability Alert
Ruby on Rails contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
Ruby on Rails has confirmed the vulnerability and released updated software.
Indicators of Compromise
Ruby on Rails versions prior to 3.0.20 and 2.3.16 are vulnerable.
The vulnerability is in the convert_json_to_yaml() method of the JSON parser of the affected software while transforming the JSON into YAML-formatted data.
An unauthenticated, remote attacker could exploit this vulnerability by submitting a crafted JSON payload. The attacker could then cause the back end to decode a subset of YAML. Successful exploitation could allow the attacker to execute arbitrary code on the system. In addition, the attacker may be able to bypass authentication systems, inject arbitrary SQL, or cause a targeted application to terminate abnormally, resulting in a DoS condition for legitimate users.
To exploit the vulnerability, the attacker may need to send a crafted JSON file to the targeted system. Depending on how the targeted application accepts user data, the attacker may use social engineering techniques or could send application requests to deliver the crafted data to the system.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to monitor affected systems.
Ruby on Rails has released a security announcement and a release announcement at the following links:
Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.