CVE-2012-1870 in Windows
Summary
by MITRE
The CBC mode in the TLS protocol, as used in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, Windows 7 Gold and SP1, and other products, allows remote web servers to obtain plaintext data by triggering multiple requests to a third-party HTTPS server and sniffing the network during the resulting HTTPS session, aka "TLS Protocol Vulnerability."
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Analysis
by VulDB Data Team • 03/26/2021
The vulnerability identified as CVE-2012-1870 represents a critical weakness in the Transport Layer Security protocol implementation across multiple Microsoft operating systems. This flaw specifically affects the Cipher Block Chaining mode of TLS encryption, creating a scenario where remote attackers can systematically extract plaintext information from encrypted HTTPS communications. The vulnerability stems from how these systems handle certain cryptographic operations during TLS handshakes and data transmission processes, particularly when dealing with block cipher modes that are susceptible to specific attack vectors.
The technical exploitation of this vulnerability occurs through a sophisticated attack pattern known as the TLS protocol vulnerability or more specifically the "CBC bit-flipping attack" variant. Attackers can leverage this weakness by crafting multiple requests to a third-party HTTPS server, which triggers the vulnerable systems to perform cryptographic operations that reveal information about the encrypted data. The attack exploits the deterministic nature of certain block cipher implementations in TLS CBC mode, where predictable patterns in the ciphertext can be manipulated to infer information about the plaintext. This vulnerability is categorized under CWE-310 as Cryptographic Vulnerability, specifically targeting weaknesses in cryptographic implementations.
The operational impact of CVE-2012-1870 is severe and far-reaching across the affected Microsoft platforms including Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2, and Windows 7 Gold and SP1. Organizations running these systems face significant risks to data confidentiality, as attackers can systematically recover sensitive information such as session cookies, authentication tokens, and other encrypted data transmitted over HTTPS connections. The attack requires minimal privileges and can be executed remotely, making it particularly dangerous for web applications and services that rely on HTTPS encryption for security. This vulnerability directly impacts the CIA triad by compromising confidentiality and can be mapped to ATT&CK technique T1041 for Exfiltration Over C2 Channel, though in this case the exploitation occurs through the TLS protocol itself rather than a command and control channel.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security patches that address the specific TLS implementation weaknesses in affected systems. Organizations should also implement network monitoring solutions to detect anomalous traffic patterns that may indicate exploitation attempts, particularly focusing on repeated requests to HTTPS endpoints that could trigger the vulnerability. Network segmentation and the implementation of additional security layers such as web application firewalls can provide defense-in-depth protection. The most effective remediation involves upgrading to supported operating systems that have proper TLS implementations, as the affected systems are no longer receiving security updates. Additionally, organizations should review their cryptographic configurations to ensure that CBC mode is not being used in TLS contexts where this vulnerability could be exploited, and consider implementing more secure alternatives such as TLS 1.2 with GCM cipher suites that are resistant to these types of attacks.