CVE-2003-0370 in KDE
Summary
by MITRE
Konqueror Embedded and KDE 2.2.2 and earlier does not validate the Common Name (CN) field for X.509 Certificates, which could allow remote attackers to spoof certificates via a man-in-the-middle attack.
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Analysis
by VulDB Data Team • 06/28/2021
The vulnerability described in CVE-2003-0370 represents a critical flaw in the certificate validation mechanism of Konqueror Embedded and KDE 2.2.2 and earlier versions. This issue stems from the improper handling of X.509 certificate verification processes, specifically the failure to properly validate the Common Name field which serves as a crucial component in establishing trust relationships between entities in secure communications. The flaw exists within the cryptographic certificate validation framework that is fundamental to secure web browsing and data transmission protocols.
The technical implementation of this vulnerability occurs when the affected software components process X.509 certificates without performing adequate validation of the Common Name field present in the certificate's subject section. This validation gap allows malicious actors to craft certificates that appear legitimate but contain falsified Common Name values. When a user connects to a website or service, the software accepts certificates that should have been rejected due to mismatched or forged Common Name fields, thereby enabling attackers to establish fraudulent secure connections that appear trustworthy to the end user.
The operational impact of this vulnerability extends beyond simple certificate validation failures and creates significant security risks for users of affected systems. Attackers can exploit this weakness to perform man-in-the-middle attacks by presenting forged certificates that match the target website's domain in the Common Name field while maintaining the appearance of legitimate secure connections. This capability undermines the fundamental security assurances provided by SSL/TLS protocols and enables unauthorized interception of sensitive data, session hijacking, and potential credential theft. The vulnerability affects users of Konqueror Embedded and KDE environments, which were widely used in enterprise and personal computing contexts during the early 2000s.
This vulnerability aligns with CWE-295 which specifically addresses improper certificate validation and represents a classic example of trust validation failure in cryptographic systems. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under the 'Initial Access' and 'Credential Access' phases, where attackers leverage certificate manipulation to establish unauthorized access to systems and data. The flaw demonstrates the critical importance of proper certificate validation procedures as outlined in PKI (Public Key Infrastructure) standards and RFC 5280 specifications that govern X.509 certificate processing. Organizations should implement proper certificate validation mechanisms that include comprehensive Common Name verification, implement certificate pinning where appropriate, and ensure that all software components maintain up-to-date security patches to prevent exploitation of such validation weaknesses. The remediation strategy requires immediate patching of affected KDE and Konqueror installations, along with comprehensive security awareness training for users regarding the importance of certificate verification and the potential risks associated with untrusted certificate warnings.