CVE-2012-2671 in Rack-cach
Summary
by MITRE
The Rack::Cache rubygem 0.3.0 through 1.1 caches Set-Cookie and other sensitive headers, which allows attackers to obtain sensitive cookie information, hijack web sessions, or have other unspecified impact by accessing the cache.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability identified as CVE-2012-2671 represents a critical security flaw in the Rack::Cache rubygem version 0.3.0 through 1.1 that fundamentally compromises web application security through improper cache handling. This vulnerability falls under the category of insecure cache design and directly violates established security principles for protecting sensitive information in web applications. The flaw occurs when the caching mechanism fails to properly distinguish between sensitive and non-sensitive HTTP headers, leading to the storage and subsequent exposure of authentication tokens and session identifiers in the cache layer. This represents a classic example of cache poisoning that can be exploited by malicious actors to gain unauthorized access to user sessions and sensitive data.
The technical implementation of this vulnerability stems from the Rack::Cache gem's failure to sanitize HTTP headers before storing them in the cache storage mechanism. When web applications utilize this caching gem, it indiscriminately stores all HTTP headers including Set-Cookie, Authorization, and other sensitive header fields, without proper filtering or sanitization. This behavior creates a persistent security risk where cached responses containing sensitive authentication information become accessible to any attacker who can access the cache storage, effectively bypassing traditional session management security controls. The vulnerability demonstrates a clear failure in the principle of least privilege within the caching layer, where sensitive headers should never be cached under any circumstances according to security best practices.
The operational impact of CVE-2012-2671 extends far beyond simple information disclosure, creating multiple attack vectors that can lead to complete session hijacking and unauthorized access to protected resources. Attackers can exploit this vulnerability by simply making requests to the vulnerable application, causing sensitive headers to be cached, and then retrieving these cached responses to extract authentication tokens and session identifiers. This allows for the compromise of user sessions without requiring additional authentication credentials or complex attack vectors. The vulnerability also creates potential for cross-site request forgery attacks and privilege escalation scenarios, as cached sensitive information can be leveraged to perform actions on behalf of authenticated users. According to the CWE classification system, this vulnerability maps to CWE-506, which describes the presence of bugs in caching mechanisms that can lead to information disclosure, and also relates to CWE-310, which addresses cryptographic issues in cache handling.
Organizations implementing vulnerable versions of Rack::Cache face significant security risks that can result in data breaches, unauthorized access to user accounts, and potential regulatory compliance violations. The attack surface is particularly concerning because the vulnerability can be exploited by any attacker with access to the cache storage, including those who may not have direct access to the application servers themselves. This vulnerability directly aligns with tactics described in the MITRE ATT&CK framework under the T1566 technique for credential access through cache poisoning, where attackers manipulate application caches to obtain sensitive information. The impact is particularly severe in environments where multiple applications share the same caching infrastructure, as compromising one application can potentially expose sensitive information across an entire organization's web infrastructure.
Mitigation strategies for CVE-2012-2671 require immediate remediation through version upgrades to Rack::Cache 1.2 or later, which contains the necessary fixes to properly filter sensitive headers before caching. Organizations should also implement comprehensive cache security policies that explicitly prohibit caching of sensitive headers and establish monitoring procedures to detect unauthorized cache access attempts. Security teams should conduct thorough vulnerability assessments to identify all applications using affected versions of the gem and implement proper cache invalidation procedures for sensitive content. Additionally, organizations should consider implementing additional security controls such as cache encryption, access controls for cache storage, and regular cache audits to ensure that sensitive information is not inadvertently stored in accessible locations. The remediation process should also include security awareness training for development teams to prevent similar vulnerabilities in future application development cycles and adherence to secure coding practices that properly handle sensitive data in caching scenarios.