CVE-2024-24784 in net-mail
Summary
by MITRE • 03/06/2024
The ParseAddressList function incorrectly handles comments (text within parentheses) within display names. Since this is a misalignment with conforming address parsers, it can result in different trust decisions being made by programs using different parsers.
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Analysis
by VulDB Data Team • 04/15/2026
The vulnerability identified as CVE-2024-24784 resides within the ParseAddressList function of email address parsing implementations, specifically targeting how the function processes comments enclosed in parentheses within display names. This flaw represents a significant deviation from established email parsing standards and can lead to inconsistent interpretation of email addresses across different systems. The issue manifests when email clients or servers attempt to parse addresses that contain parenthetical comments within the display name portion, creating a scenario where the same address may be interpreted differently depending on which parsing engine is utilized.
The technical root cause of this vulnerability stems from improper handling of RFC-compliant email address formats where comments are permitted within display names. According to email standards such as RFC 5322, display names can contain comments that are enclosed in parentheses, and these comments should be parsed and handled appropriately without affecting the core address parsing logic. However, the affected ParseAddressList function fails to correctly process these comments, potentially leading to parsing failures, incorrect address extraction, or misinterpretation of recipient information. This misalignment with standard parsing behavior creates a fundamental inconsistency that can be exploited to manipulate trust decisions in email processing systems.
The operational impact of this vulnerability extends beyond simple parsing errors and can significantly affect email security and trust mechanisms. When different email systems use varying parsers to interpret the same address, they may make different trust decisions based on their interpretation of the address structure. This inconsistency can enable attackers to craft email addresses that appear valid to one system but are interpreted as malicious or suspicious by another system, potentially bypassing security controls or triggering different filtering behaviors. The vulnerability particularly affects email security gateways, spam filters, and email processing systems that rely on accurate address parsing for trust decisions.
Mitigation strategies for CVE-2024-24784 should focus on implementing proper RFC 5322-compliant parsing logic that correctly handles comments within display names. Organizations should update their email processing systems to ensure consistent handling of parenthetical comments according to established standards. The fix should involve modifying the ParseAddressList function to properly parse and preserve comment information without disrupting the core address parsing logic. This vulnerability aligns with CWE-129, which addresses improper handling of input boundaries, and relates to ATT&CK technique T1190, which involves exploiting vulnerabilities in email systems. Security teams should also implement monitoring for inconsistent address parsing behaviors and ensure that all email processing components maintain alignment with standard email parsing specifications to prevent exploitation of this vulnerability.