CVE-2024-27281 is a medium-severity vulnerability affecting RDoc versions 6.3.3 through 6.6.2, which are included in Ruby 3.x up to version 3.3.0. This vulnerability allows for object injection and remote code execution due to the lack of restrictions on the classes that can be restored when parsing .rdoc_options files used for configuration. Additionally, if a crafted documentation cache is loaded, similar attacks may occur.
Given the severity of this vulnerability, organizations utilizing affected versions should prioritize remediation. The main fixed version is 6.6.3.1, while specific patches are available for different Ruby versions: rdoc 6.3.4.1 for Ruby 3.0, rdoc 6.4.1.1 for Ruby 3.1, and rdoc 6.5.1.1 for Ruby 3.2.
The exploitation of this vulnerability can lead to severe consequences, including unauthorized execution of code within the context of the affected application. Therefore, understanding the implications and taking immediate action is critical for risk management.
Organizations should assess their current Ruby versions and RDoc dependencies to identify any instances of this vulnerability. Remediation efforts should be a part of the priority patch cycle, ensuring that systems remain secure against potential exploitation.
Vulnerability Details
An issue was discovered in RDoc 6.3.3 through 6.6.2, as distributed in Ruby 3.x through 3.3.0. When parsing .rdoc_options (used for configuration in RDoc) as a YAML file, object injection and resultant remote code execution are possible because there are no restrictions on the classes that can be restored. When loading the documentation cache, object injection and resultant remote code execution are also possible if there were a crafted cache.
The main fixed version is 6.6.3.1. For Ruby 3.0 users, a fixed version is rdoc 6.3.4.1. For Ruby 3.1 users, a fixed version is rdoc 6.4.1.1. For Ruby 3.2 users, a fixed version is rdoc 6.5.1.1.
Technical Analysis
The root cause of this vulnerability lies in the improper handling of YAML parsing within the RDoc configuration options. Specifically, the lack of class restrictions during object restoration allows attackers to inject malicious objects into the application context, leading to remote code execution.
The attack vector is local, requiring the attacker to have access to the local environment where RDoc is executed. The attack complexity is classified as high due to the requirement for user interaction, as crafted .rdoc_options files must be supplied.
Privileges required are none, meaning that any user can initiate an attack if they can influence the configuration files. The impacts on confidentiality, integrity, and availability are all rated as low, but the potential for remote code execution remains a significant concern.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized access and execution of arbitrary code. Given the nature of the vulnerability, where user input can be manipulated to exploit the RDoc functionality, the blast radius can extend to any application utilizing affected versions.
Organizations should assess the risk based on their deployment of Ruby and RDoc versions in production. The urgency for patching is medium, aligning with the remediation priority of this vulnerability.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions are RDoc 6.3.3 through 6.6.2. The main fixed version is 6.6.3.1. Additionally, specific fixed versions for Ruby users include rdoc 6.3.4.1 for Ruby 3.0, rdoc 6.4.1.1 for Ruby 3.1, and rdoc 6.5.1.1 for Ruby 3.2.
Mitigation & Remediation
Organizations should upgrade to the latest fixed version of RDoc to mitigate this vulnerability. If an upgrade is not immediately possible, consider implementing configuration hardening measures that limit access to .rdoc_options files and monitor for anomalous behavior within Ruby applications.
For those seeking to validate the security posture of their applications, organizations may consider utilizing penetration testing services that focus on identifying these types of vulnerabilities.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual file manipulations related to .rdoc_options and YAML parsing operations. Behavioral anomalies when processing documentation files may also indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2024-27281 highlights the ongoing challenges faced by organizations in managing code execution vulnerabilities, particularly those that involve configuration files. Security teams should take this incident as a reminder of the necessity for strict validation of user-supplied configurations.
To further enhance their security posture, organizations can benefit from establishing a comprehensive vulnerability management program that continuously monitors for such issues.
Additionally, adopting best practices in penetration testing methodology can help organizations identify and address vulnerabilities proactively.
Finally, leveraging insights from threat intelligence can guide security teams in understanding the landscape of vulnerabilities, allowing for more informed strategic decisions.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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