CVE-2007-3754 in iPhone
Summary
by MITRE
Mail in Apple iPhone 1.1.1, when using SSL, does not warn the user when the mail server changes or is not trusted, which might allow remote attackers to steal credentials and read email via a man-in-the-middle (MITM) attack.
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Analysis
by VulDB Data Team • 04/23/2018
The vulnerability described in CVE-2007-3754 represents a critical security flaw in Apple iPhone 1.1.1 mail client that fundamentally undermines the trust model of secure email communications. This issue specifically affects the SSL/TLS certificate validation process during email server connections, creating a significant attack surface for malicious actors. The flaw operates by failing to implement proper certificate verification mechanisms that should alert users when encountering untrusted or changed mail server certificates. This behavior directly violates fundamental security principles that require explicit user notification when cryptographic trust boundaries are compromised, making it particularly dangerous in enterprise and personal email environments where sensitive data is routinely transmitted.
The technical implementation of this vulnerability stems from insufficient certificate validation routines within the iPhone's mail application. When establishing SSL connections to mail servers, the application does not properly verify the server certificate against trusted certificate authorities or check for certificate chain integrity. This allows attackers to perform man-in-the-middle attacks by presenting fake certificates that appear legitimate to the user interface. The vulnerability specifically impacts the SSL/TLS handshake process where certificate validation should occur, but instead the system proceeds with the connection without user awareness. This represents a classic case of inadequate cryptographic implementation that violates established security protocols and standards.
The operational impact of this vulnerability extends far beyond simple credential theft, creating opportunities for comprehensive email surveillance and data exfiltration. Attackers can exploit this flaw to intercept all email communications, including sensitive business correspondence, personal information, and potentially confidential organizational data. The lack of user warnings means that victims remain completely unaware that their communications are being monitored or intercepted, making this attack particularly insidious. From an attacker perspective, this vulnerability provides a stealthy method for conducting long-term surveillance campaigns without detection, as users continue to believe they are communicating securely with their mail servers.
This vulnerability aligns with CWE-295, which addresses improper certificate validation, and demonstrates characteristics consistent with ATT&CK technique T1566 related to credential harvesting through phishing and man-in-the-middle attacks. The flaw represents a failure in the security architecture that should have implemented proper certificate pinning or validation mechanisms. Organizations using iPhone mail clients in environments requiring secure communications would be particularly vulnerable to this attack vector. The impact is exacerbated by the widespread adoption of these devices and the implicit trust users place in mobile email applications. Remediation requires immediate software updates from Apple, but the vulnerability also highlights the importance of implementing additional security controls such as network monitoring and certificate transparency mechanisms.
The broader implications of this vulnerability extend to mobile security practices and user education regarding secure communication channels. It demonstrates how mobile device security can be compromised through seemingly minor implementation flaws in cryptographic validation processes. Organizations should consider implementing additional layers of security such as email encryption protocols beyond SSL/TLS, network segmentation, and regular security assessments of mobile device configurations. The vulnerability also underscores the critical importance of proper certificate management and the need for robust user awareness training regarding potential security warnings and indicators of compromised communications.