CVE-2013-5036 in Square Squash
Summary
by MITRE
The Square Squash allows remote attackers to execute arbitrary code via a YAML document in the (1) namespace parameter to the deobfuscation function or (2) sourcemap parameter to the sourcemap function in app/controllers/api/v1_controller.rb.
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Analysis
by VulDB Data Team • 12/26/2024
The vulnerability identified as CVE-2013-5036 represents a critical remote code execution flaw within a web application framework that processes YAML input through specific controller parameters. This vulnerability exists in the deobfuscation function and sourcemap function within the api/v1_controller.rb file, creating a pathway for malicious actors to inject and execute arbitrary code on the target system. The flaw stems from insufficient input validation and sanitization mechanisms that fail to properly handle untrusted YAML data, allowing attackers to craft malicious payloads that bypass normal security controls.
The technical implementation of this vulnerability leverages the inherent capabilities of YAML parsing libraries to deserialize and execute code objects within the parsed data structure. When the application processes the namespace parameter in the deobfuscation function or the sourcemap parameter in the sourcemap function, it inadvertently executes serialized Ruby objects contained within the YAML document. This behavior aligns with common security weaknesses documented under CWE-502, which specifically addresses deserialization of untrusted data, and represents a classic example of unsafe deserialization attacks that can lead to complete system compromise.
The operational impact of CVE-2013-5036 extends far beyond simple data manipulation, as successful exploitation can result in full system compromise, data exfiltration, and persistence mechanisms within the affected environment. Attackers can leverage this vulnerability to execute arbitrary commands with the privileges of the application process, potentially leading to privilege escalation, lateral movement within the network, and establishment of backdoors. The remote nature of this vulnerability means that attackers can exploit it from anywhere on the internet without requiring physical access to the target system, making it particularly dangerous for publicly accessible web applications.
Organizations affected by this vulnerability should implement immediate mitigations including input validation and sanitization measures that prevent YAML deserialization of untrusted data, parameter filtering that restricts the namespace and sourcemap parameters to known safe values, and the implementation of proper access controls that limit the exposure of vulnerable endpoints. Security controls should also include monitoring for suspicious YAML parsing activities and network traffic patterns that may indicate exploitation attempts. This vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege, as outlined in various cybersecurity frameworks including the MITRE ATT&CK framework's methodology for identifying and mitigating remote code execution threats. The incident highlights the critical need for regular security assessments, proper input validation mechanisms, and the implementation of secure deserialization practices to prevent similar vulnerabilities from being exploited in production environments.