CVE-2014-2567 in Trojita
Summary
by MITRE
The OpenConnectionTask::handleStateHelper function in Imap/Tasks/OpenConnectionTask.cpp in Trojita before 0.4.1 allows man-in-the-middle attackers to trigger use of cleartext for saving a message into a (1) sent or (2) draft folder via a PREAUTH response that prevents later use of the STARTTLS command.
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Analysis
by VulDB Data Team • 05/08/2026
The vulnerability described in CVE-2014-2567 represents a significant security flaw in the Trojita email client version 0.4.0 and earlier, specifically within the IMAP protocol implementation. This issue stems from improper handling of the IMAP connection state during the initial authentication phase, creating a window where attackers can manipulate the connection establishment process to downgrade security measures. The flaw occurs in the OpenConnectionTask::handleStateHelper function located in Imap/Tasks/OpenConnectionTask.cpp, which governs how the client processes server responses during the connection initialization sequence.
The technical mechanism behind this vulnerability involves a man-in-the-middle attack scenario where an attacker intercepts the initial IMAP connection between the client and server. When the server responds with a PREAUTH response, which is typically used to indicate that the server is ready to accept authentication without requiring a full authentication sequence, the Trojita client incorrectly interprets this response as a signal to proceed with cleartext communication. This misinterpretation prevents the client from attempting the STARTTLS command that would normally upgrade the connection to a secure encrypted state, leaving the communication vulnerable to eavesdropping and modification. The vulnerability specifically affects the saving of messages to sent or draft folders, making it particularly dangerous for users who store sensitive information in these locations.
The operational impact of this vulnerability extends beyond simple data interception, as it fundamentally undermines the security assurances that users expect from secure email communications. Attackers can exploit this weakness to capture sensitive email content, potentially including personal information, business correspondence, or confidential communications that users believe are protected by encryption. The vulnerability is particularly concerning because it affects the core functionality of email client security features, specifically targeting the mechanisms that ensure data integrity and confidentiality during transmission. This weakness creates a persistent risk for users who rely on Trojita for secure email communication, as the downgrade to cleartext occurs automatically without user intervention or awareness.
The vulnerability aligns with CWE-319, which addresses the improper handling of cleartext transmission of sensitive information, and relates to ATT&CK technique T1041 by enabling unauthorized interception of communications. Organizations using affected versions of Trojita should immediately implement mitigations including updating to version 0.4.1 or later, which includes proper handling of PREAUTH responses to ensure that STARTTLS is attempted regardless of the initial server response. Additionally, administrators should consider implementing network-level security measures such as encrypted DNS resolution and monitoring for unusual connection patterns that might indicate man-in-the-middle activity. The fix implemented in version 0.4.1 ensures that the client properly evaluates whether to attempt TLS upgrades even when receiving PREAUTH responses, thereby maintaining secure communication channels and protecting user data from interception attacks.