CVE-2005-3256 in Enigmail
Summary
by MITRE
The key selection dialogue in Enigmail before 0.92.1 can incorrectly select a key with a user ID that does not have additional information, which allows parties with that key to decrypt the message.
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Analysis
by VulDB Data Team • 08/04/2019
The vulnerability described in CVE-2005-3256 affects Enigmail versions prior to 0.92.1, representing a critical flaw in the email encryption system's key selection mechanism. This issue resides within the cryptographic key management process where the system fails to properly validate user identity information during the key selection dialogue. The vulnerability stems from inadequate validation of key attributes, specifically user IDs that lack additional identifying information such as email addresses or full names. This weakness creates a scenario where the encryption system may inadvertently choose an incorrect key, potentially allowing unauthorized parties to decrypt messages intended for specific recipients.
The technical flaw manifests in the key selection algorithm's insufficient verification of user identity attributes. When users attempt to encrypt messages using Enigmail, the system presents a dialogue for key selection based on available public keys. However, the vulnerability allows keys with minimal user ID information to be selected over keys with more complete identity verification. This occurs because the system does not properly enforce criteria that would ensure the selected key corresponds to the intended recipient. The flaw falls under the category of improper input validation and weak cryptographic key management practices, creating an attack surface where adversaries can exploit the system's failure to validate key authenticity.
The operational impact of this vulnerability extends beyond simple message decryption issues, as it fundamentally compromises the confidentiality assurances provided by the encryption system. When parties with keys that have incomplete user ID information are selected for encryption, they can potentially access messages that should remain confidential to specific intended recipients. This creates a significant risk for organizations relying on Enigmail for secure communications, as sensitive information could be exposed to unauthorized individuals. The vulnerability directly impacts the integrity of the encryption process and undermines the trust model that email encryption systems depend upon for secure communication. Attackers could exploit this weakness to perform man-in-the-middle attacks or simply intercept messages intended for other parties, representing a serious compromise of the system's security posture.
Mitigation strategies for CVE-2005-3256 require immediate implementation of the patched version 0.92.1 or later, which addresses the key selection validation issue. Organizations should conduct comprehensive security assessments of their email encryption systems to identify any remaining vulnerabilities in their cryptographic infrastructure. The fix implemented in the updated version ensures proper validation of user identity information during key selection, requiring that keys have complete user ID attributes before being considered for encryption operations. Security administrators should also implement additional verification processes such as key fingerprint validation and certificate pinning to strengthen the overall encryption framework. This vulnerability aligns with CWE-295 which addresses improper certificate validation and relates to ATT&CK technique T1552.004 for unsecured credentials, emphasizing the importance of proper key management and validation in cryptographic systems. Regular security audits and updates of cryptographic tools remain essential to prevent similar vulnerabilities from compromising secure communication channels.