CVE-2008-4227 in iPhone OS
Summary
by MITRE
Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 changes the encryption level of PPTP VPN connections to a lower level than was previously used, which makes it easier for remote attackers to obtain sensitive information or hijack a connection by decrypting network traffic.
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Analysis
by VulDB Data Team • 08/29/2019
The vulnerability identified as CVE-2008-4227 represents a significant cryptographic regression in Apple's iPhone OS and iPod touch operating systems spanning versions 1.0 through 2.1. This issue fundamentally alters the security posture of PPTP VPN connections by reducing their encryption strength, creating exploitable weaknesses that adversaries can leverage to compromise network communications. The vulnerability specifically impacts users who rely on PPTP VPN protocols for secure remote access, particularly in enterprise environments where sensitive data transmission is critical. The change in encryption level represents a direct violation of established security protocols and undermines the trust model that users expect from mobile operating systems when establishing secure connections.
The technical flaw manifests through a deliberate downgrade of encryption standards within the PPTP implementation, where the operating system no longer maintains the previously established security levels. This regression affects the cryptographic algorithms and key exchange mechanisms used in PPTP connections, making them susceptible to various attacks including man-in-the-middle scenarios and traffic decryption. The vulnerability essentially weakens the security controls that should protect data in transit, allowing attackers with sufficient resources to intercept and analyze network traffic without proper authorization. This represents a failure in cryptographic implementation and configuration management, where the system automatically reduces security measures without user consent or awareness, creating a persistent security risk for all affected devices.
The operational impact of this vulnerability extends beyond simple data exposure to include potential connection hijacking and unauthorized access to corporate networks. Remote attackers can exploit the reduced encryption to gain insights into network communications, potentially accessing sensitive business data, credentials, or proprietary information transmitted through PPTP connections. The vulnerability affects organizations that depend on PPTP VPN for remote employee access, creating a significant risk for enterprises that may not have adequate network monitoring or alternative secure communication channels. This weakness particularly impacts mobile workers who rely on the iPhone and iPod touch for business communications, as their devices become vulnerable to passive network surveillance and active attack vectors.
Organizations should implement immediate mitigation strategies including disabling PPTP VPN usage on affected devices and transitioning to more secure alternatives such as IPsec or L2TP/IPsec protocols. Network administrators should conduct comprehensive vulnerability assessments to identify all affected devices and implement network monitoring to detect potential exploitation attempts. The remediation process requires updating to newer operating system versions where this vulnerability has been addressed, though organizations should also consider implementing additional security controls such as network segmentation and traffic analysis tools. This vulnerability highlights the importance of maintaining up-to-date security implementations and the risks associated with automatic security downgrades in mobile operating systems, aligning with CWE-310 and ATT&CK techniques related to cryptographic weakness and credential access through network traffic interception.