CVE-2013-7489 in Beaker Library
Summary
by MITRE
The Beaker library through 1.11.0 for Python is affected by deserialization of untrusted data, which could lead to arbitrary code execution.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/21/2023
The Beaker library vulnerability CVE-2013-7489 represents a critical security flaw in the Python web application framework that has significant implications for application security. This vulnerability specifically affects versions of the Beaker library through 1.11.0 and stems from improper handling of serialized data within the library's caching mechanisms. The issue manifests when the library processes serialized objects from untrusted sources, creating a pathway for malicious actors to execute arbitrary code on systems running vulnerable applications. The vulnerability is particularly concerning because it operates at the serialization layer where data integrity and source verification are paramount for maintaining system security boundaries.
The technical flaw in CVE-2013-7489 is classified as a deserialization vulnerability that aligns with CWE-502, which specifically addresses the deserialization of untrusted data. This weakness occurs when applications deserialize data without proper validation or sanitization of the input, allowing attackers to craft malicious serialized objects that, when processed by the vulnerable library, trigger unintended code execution. The Beaker library's cache implementation accepts serialized data from various sources including session data, cache entries, and other user-controllable inputs, making it susceptible to exploitation. When the library deserializes this data, it executes the embedded code without sufficient security checks or sandboxing mechanisms to prevent malicious payloads from being interpreted as legitimate application logic.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise and data breaches. Attackers exploiting CVE-2013-7489 can gain unauthorized access to application servers, potentially leading to privilege escalation, data exfiltration, and persistent backdoor installation. The vulnerability affects web applications that utilize Beaker's caching functionality, which is common in many Python-based frameworks including Pylons and various Django applications. This widespread usage means that the potential attack surface is extensive, with numerous applications across different industries and sectors vulnerable to exploitation. The vulnerability can be leveraged through various attack vectors including session manipulation, cache poisoning, and user input injection, making it particularly dangerous in environments where applications process untrusted data from external sources.
Organizations affected by CVE-2013-7489 should prioritize immediate remediation through version updates to Beaker 1.11.1 or later, which includes proper deserialization safeguards and input validation mechanisms. Security teams should implement network segmentation and monitoring to detect potential exploitation attempts, particularly focusing on unusual cache operations and serialization activities. The mitigation strategy should also include thorough code reviews to identify any custom implementations that might be using vulnerable serialization patterns outside the standard library. Additionally, implementing proper input validation at multiple layers of the application architecture and adopting secure coding practices that prevent untrusted data from reaching serialization functions will significantly reduce the risk of exploitation. This vulnerability demonstrates the critical importance of secure deserialization practices and aligns with ATT&CK technique T1203, which covers exploitation of software vulnerabilities through deserialization attacks, emphasizing the need for comprehensive security controls throughout the application lifecycle.