CVE-2008-0556 in OpenCA PKI
Summary
by MITRE
Cross-site request forgery (CSRF) vulnerability in OpenCA PKI 0.9.2.5, and possibly earlier versions, allows remote attackers to perform unauthorized actions as authorized users via a link or IMG tag to RAServer.
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Analysis
by VulDB Data Team • 04/23/2025
The CVE-2008-0556 vulnerability represents a critical cross-site request forgery flaw within the OpenCA PKI 0.9.2.5 software suite and potentially older versions. This vulnerability resides in the RAServer component of the OpenCA Public Key Infrastructure system, which serves as a critical backend service for managing certificate requests and related cryptographic operations. The flaw fundamentally undermines the authentication and authorization mechanisms that protect sensitive administrative functions within the PKI environment.
The technical exploitation of this CSRF vulnerability occurs through the manipulation of web-based interfaces that lack proper anti-CSRF protection mechanisms. Attackers can construct malicious links or IMG tags that, when clicked by authenticated users, trigger unauthorized actions within the OpenCA PKI system. The vulnerability stems from the absence of unique tokens or other anti-CSRF measures that would normally validate the authenticity of requests originating from legitimate user sessions. This allows remote attackers to perform administrative operations such as certificate issuance, revocation, or user management without proper authorization, effectively compromising the entire PKI infrastructure.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can lead to complete compromise of the certificate authority infrastructure. An attacker who successfully exploits this vulnerability can issue fraudulent certificates, revoke legitimate ones, or manipulate user accounts within the PKI system. This creates a cascading security failure that can undermine the trust model that PKI systems are designed to maintain, potentially allowing attackers to impersonate legitimate entities or decrypt sensitive communications protected by certificates issued through the compromised system. The vulnerability particularly affects environments where the RAServer component is exposed to untrusted networks or where users may inadvertently click on malicious links in email or web content.
Organizations affected by this vulnerability should immediately implement mitigations including the deployment of anti-CSRF tokens for all state-changing operations within the RAServer interface, proper session management controls, and the implementation of referer header validation. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery weaknesses in web applications. From an ATT&CK perspective, this vulnerability maps to T1566.001, representing the initial access through spearphishing attachments, and T1078.004, involving legitimate credentials use for persistence. The most effective remediation approach involves upgrading to patched versions of OpenCA PKI, implementing proper CSRF protection mechanisms, and conducting comprehensive security assessments of all web-based PKI management interfaces. Organizations should also consider implementing network segmentation to limit exposure of the RAServer component and establish monitoring for suspicious administrative activities that may indicate exploitation attempts.