CVE-2009-3273 in iPhone OS
Summary
by MITRE
iPhone Mail in Apple iPhone OS, and iPhone OS for iPod touch, does not validate X.509 certificates, which allows man-in-the-middle attackers to spoof arbitrary SSL e-mail servers via a crafted certificate.
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Analysis
by VulDB Data Team • 06/16/2017
The vulnerability identified as CVE-2009-3273 represents a critical security flaw in the iPhone Mail application running on Apple iPhone OS and iPod touch devices. This issue stems from the absence of proper X.509 certificate validation mechanisms within the email client's secure communication stack. The flaw specifically affects the SSL/TLS certificate verification process that should normally occur when establishing secure connections between email clients and mail servers. When X.509 certificates are not properly validated, the system cannot authenticate the identity of the remote server, creating an exploitable condition that undermines the fundamental security guarantees of encrypted communications.
The technical implementation of this vulnerability allows malicious actors to perform man-in-the-middle attacks by presenting crafted certificates that appear legitimate to the vulnerable iPhone Mail application. This occurs because the application fails to perform the necessary certificate chain validation, issuer verification, and hostname matching procedures that are standard requirements for secure SSL/TLS connections. The absence of certificate validation means that attackers can generate fake certificates that contain valid signatures but are not issued by trusted Certificate Authorities, enabling them to intercept and potentially modify email communications between users and their mail servers. This flaw directly violates the core principles of public key infrastructure and secure communication protocols as defined by industry standards.
The operational impact of CVE-2009-3273 extends beyond simple privacy concerns to encompass potential data integrity violations and credential theft. Attackers can exploit this vulnerability to eavesdrop on sensitive email communications, potentially accessing confidential business information, personal data, or authentication credentials transmitted through email. The vulnerability affects all versions of iPhone OS and iPod touch operating systems that were vulnerable at the time of discovery, creating a widespread exposure across affected devices. This weakness particularly impacts enterprise users who rely on email security for business communications, as it undermines the trust model that secure email systems depend upon for protecting sensitive corporate data.
Organizations and users affected by this vulnerability should implement immediate mitigations including updating to patched versions of iPhone OS, enabling additional security layers such as VPN connections for email access, and implementing network monitoring to detect potential man-in-the-middle attacks. The vulnerability aligns with ATT&CK technique T1566 which covers credential harvesting through social engineering and man-in-the-middle attacks, and maps to CWE-295 which addresses improper certificate validation in security protocols. Security administrators should also consider deploying email encryption solutions such as PGP or S/MIME to provide additional protection layers, as the certificate validation failure creates a fundamental weakness in the transport layer security that can be exploited for various malicious activities including data exfiltration and credential compromise.