CVE-2011-3389 in Security Service
Summary
by MITRE
The SSL protocol, as used in certain configurations in Microsoft Windows and Microsoft Internet Explorer, Mozilla Firefox, Google Chrome, Opera, and other products, encrypts data by using CBC mode with chained initialization vectors, which allows man-in-the-middle attackers to obtain plaintext HTTP headers via a blockwise chosen-boundary attack (BCBA) on an HTTPS session, in conjunction with JavaScript code that uses (1) the HTML5 WebSocket API, (2) the Java URLConnection API, or (3) the Silverlight WebClient API, aka a "BEAST" attack.
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Analysis
by VulDB Data Team • 01/06/2025
The vulnerability identified as CVE-2011-3389 represents a critical weakness in the Secure Sockets Layer protocol implementation across multiple major web browsers and operating systems. This flaw specifically affects the SSL 3.0 and TLS 1.0 protocols when they utilize Cipher Block Chaining mode with chained initialization vectors, creating a pathway for sophisticated man-in-the-middle attacks that can compromise encrypted communications. The vulnerability operates under the Common Weakness Enumeration CWE-310 category, which encompasses cryptographic weaknesses that can lead to information disclosure and data integrity breaches.
The technical exploitation of this vulnerability relies on a blockwise chosen-boundary attack mechanism that allows attackers to decrypt HTTP headers from HTTPS sessions without requiring direct access to the encryption keys. This attack vector specifically targets the way these protocols handle initialization vectors in CBC mode encryption, where each block of plaintext is XORed with the previous ciphertext block before encryption. The BEAST attack leverages this chaining mechanism to gradually reconstruct plaintext data by observing the patterns in encrypted communications. The attack requires JavaScript code execution within the victim's browser environment, utilizing three specific APIs: HTML5 WebSocket API, Java URLConnection API, or Silverlight WebClient API to facilitate the decryption process through repeated requests and pattern analysis.
The operational impact of CVE-2011-3389 extends beyond individual user sessions to potentially compromise entire communication channels between web browsers and servers. Attackers can exploit this vulnerability to intercept and modify sensitive data including session cookies, authentication tokens, and personal information transmitted over HTTPS connections. The attack is particularly dangerous because it can be executed against any website that uses the vulnerable SSL/TLS implementations, making it a widespread threat across the internet infrastructure. This vulnerability directly aligns with tactics described in the MITRE ATT&CK framework under the T1071.001 technique for application layer protocol usage, specifically targeting secure communication protocols to establish persistent access to network resources.
Mitigation strategies for CVE-2011-3389 require immediate implementation of protocol upgrades and configuration changes across affected systems. Organizations should prioritize upgrading to TLS 1.1 or higher versions which eliminate the CBC mode vulnerabilities present in SSL 3.0 and TLS 1.0. Browser vendors have implemented various fixes including disabling CBC mode for SSL 3.0 connections and implementing countermeasures against the BEAST attack through techniques such as TLS session renegotiation and explicit initialization vector handling. System administrators should also consider implementing additional network security measures including SSL stripping protection, monitoring for unusual traffic patterns, and ensuring that all web applications are configured to use secure cipher suites that do not rely on vulnerable CBC encryption methods. The vulnerability demonstrates the importance of proper cryptographic protocol implementation and highlights the need for continuous security auditing of encryption implementations in web applications and operating systems.