CVE-2012-3744 in iOS
Summary
by MITRE
Telephony in Apple iOS before 6 uses an SMS message s return address as the displayed sender address, which allows remote attackers to spoof text communication via a message in which the return address does not match the originating address.
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Analysis
by VulDB Data Team • 04/13/2021
The vulnerability described in CVE-2012-3744 represents a significant security flaw in Apple iOS versions prior to 6.0 that affects the telephony subsystem's handling of SMS messages. This issue stems from the operating system's design decision to trust and display the return address field from SMS messages without proper verification mechanisms. The fundamental problem lies in how iOS processes and presents sender information, creating an environment where malicious actors can exploit the lack of authentication checks to manipulate the perceived source of text communications.
This vulnerability operates at the application layer of the communication stack, specifically within the SMS message processing module of the iOS telephony framework. The technical flaw manifests when an attacker crafts an SMS message with a forged return address that does not correspond to the actual originating address of the message. The iOS system, lacking proper validation of the address authenticity, displays the forged return address to users, thereby creating a false impression of the message source. This behavior directly violates security principles of authentication and integrity, as the system fails to verify that the displayed sender information matches the actual message origin.
The operational impact of this vulnerability extends beyond simple deception to potentially enable sophisticated social engineering attacks and phishing attempts. Attackers can exploit this flaw to make users believe they are receiving messages from trusted sources such as banks, government agencies, or known contacts, when in reality the messages originate from malicious actors. This capability undermines user trust in the SMS communication system and creates opportunities for financial fraud, identity theft, and other malicious activities. The vulnerability affects all iOS devices running versions before 6.0, representing a widespread security concern that could be exploited at scale.
From a cybersecurity perspective, this vulnerability aligns with CWE-284, which addresses improper access control, and relates to ATT&CK technique T1566, specifically the use of spearphishing with attachments or links. The flaw represents a failure in input validation and authentication mechanisms, allowing attackers to manipulate the user interface presentation of communication data. Organizations and individuals using affected iOS versions face significant risk exposure, as the vulnerability cannot be easily detected by users and provides attackers with a stealthy method of communication manipulation. The impact is particularly severe in environments where SMS-based authentication or verification is commonly used, as attackers can exploit this weakness to bypass security controls that depend on message authenticity.
The recommended mitigation for this vulnerability involves upgrading to iOS version 6.0 or later, which includes enhanced SMS message validation and authentication mechanisms. Apple addressed this issue by implementing proper verification of message return addresses and strengthening the telephony subsystem's authentication processes. Organizations should also consider implementing additional security awareness training to help users recognize potential spoofing attempts and establish protocols for verifying the authenticity of critical messages. Network-level monitoring solutions can help detect unusual patterns in SMS traffic, though the fundamental protection relies on the patched iOS versions that properly validate message source information.