CVE-2013-2257 in Cryptocat
Summary
by MITRE
Cryptocat before 2.0.42 has Group Chat ECC Private Key Generation Brute Force Weakness
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Analysis
by VulDB Data Team • 02/04/2024
The vulnerability described in CVE-2013-2257 affects the Cryptocat messaging application version 2.0.42 and earlier, specifically targeting the elliptic curve cryptography implementation used for group chat functionality. This weakness resides in the private key generation process for elliptic curve cryptography within the group chat feature, creating a significant security risk for users relying on the application for secure communications. The issue stems from insufficient entropy during the generation of elliptic curve private keys, which makes the cryptographic keys vulnerable to brute force attacks and compromises the confidentiality of group communications.
The technical flaw manifests in the deterministic or pseudo-random number generation process used for creating elliptic curve private keys in group chat contexts. When cryptographic systems rely on weak random number generators or insufficient entropy sources, attackers can potentially predict or enumerate private keys through brute force methods. This vulnerability falls under the broader category of weak cryptographic key generation as defined by CWE-330, which specifically addresses the use of insufficient entropy in cryptographic operations. The weakness in Cryptocat's implementation means that the private keys generated for group chat sessions may not provide the expected security guarantees, as they could be vulnerable to computational attacks that exploit the predictable nature of the key generation process.
The operational impact of this vulnerability extends beyond simple confidentiality breaches, as compromised group chat sessions could lead to unauthorized access to sensitive communications, potential data exfiltration, and loss of trust in the application's security model. Attackers who successfully exploit this weakness could decrypt messages exchanged within group chats, monitor communications, or even impersonate legitimate users within the group. This threat is particularly concerning in environments where group communications contain sensitive information, such as business discussions, personal communications, or collaborative work environments where multiple participants rely on the security of the messaging platform. The vulnerability undermines the fundamental security assumptions of the application's cryptographic implementation and creates attack vectors that align with techniques described in the attack pattern taxonomy under ATT&CK framework's T1583.001 and T1583.002 for obtaining capabilities and developing capabilities through cryptographic attacks.
The mitigation strategy for this vulnerability involves updating to Cryptocat version 2.0.42 or later, which contains fixes for the elliptic curve private key generation process. Organizations and individuals should prioritize immediate deployment of the patched version to eliminate the risk of brute force attacks against group chat sessions. Additionally, system administrators should consider implementing monitoring for unusual network traffic patterns that might indicate exploitation attempts, and security teams should review their incident response procedures to address potential breaches. The fix should address the entropy sources used in key generation, ensuring that cryptographic operations utilize cryptographically secure random number generators that meet industry standards such as those specified in NIST SP 800-90A for random number generation. Security professionals should also conduct thorough testing of the patched application to verify that the cryptographic implementation now provides adequate entropy and resistance to brute force attacks, particularly in high-entropy scenarios required for secure group communications.