CVE-2007-3166 in Eudora
Summary
by MITRE
Buffer overflow in Qualcomm Eudora 7.1.0.9 allows user-assisted, remote IMAP servers to execute arbitrary code via a long FLAGS response to a SELECT INBOX command.
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Analysis
by VulDB Data Team • 09/19/2024
The vulnerability identified as CVE-2007-3166 represents a critical buffer overflow flaw in Qualcomm Eudora version 7.1.0.9 that specifically affects the IMAP protocol implementation within the email client. This security weakness arises from inadequate input validation when processing FLAGS responses from IMAP servers during the SELECT INBOX command execution. The flaw enables remote attackers to craft maliciously formatted responses that exceed the allocated buffer space, potentially leading to arbitrary code execution on the victim's system. The vulnerability operates under the premise that a user must interact with a compromised IMAP server, making it a user-assisted remote attack vector rather than a fully autonomous exploit. This classification aligns with the Common Weakness Enumeration CWE-121, which categorizes buffer overflow conditions where insufficient boundary checking allows memory corruption.
The technical implementation of this vulnerability exploits the client-side parsing mechanism of Eudora's IMAP handler without proper bounds checking on the FLAGS response data. When the email client receives a SELECT INBOX command response containing an excessively long FLAGS field, the application fails to validate the input length against the allocated buffer capacity. This condition creates a classic stack-based buffer overflow scenario where the excess data overwrites adjacent memory locations, potentially including return addresses and control data. The attack requires the victim to be actively using the affected email client and connecting to a malicious IMAP server that has been configured to send the crafted FLAGS response. The operational impact extends beyond simple code execution to potential system compromise, as successful exploitation could allow attackers to gain unauthorized access to the user's system with the privileges of the running email client process.
The security implications of CVE-2007-3166 are significant within the context of email client security and network-based attacks. This vulnerability demonstrates how seemingly routine protocol interactions can become attack vectors when proper input validation is absent. The attack surface is limited to users of the specific Eudora version, but the potential for widespread impact exists given the client's usage in corporate and personal email environments. From an operational standpoint, this vulnerability aligns with ATT&CK technique T1190 which describes exploiting vulnerabilities in software to gain execution privileges. The user-assisted nature of the attack requires social engineering elements to convince users to connect to malicious servers, making it particularly dangerous in targeted phishing campaigns or corporate espionage scenarios where attackers can manipulate email infrastructure. Organizations using this email client should consider implementing network-based controls to monitor and restrict access to potentially malicious IMAP servers, while also prioritizing immediate patch deployment or client replacement to mitigate the risk.
Mitigation strategies for CVE-2007-3166 should focus on immediate remediation through official vendor patches or complete client replacement with more modern email solutions. The vulnerability cannot be effectively addressed through network firewalls or intrusion detection systems alone, as the attack occurs during legitimate protocol interactions. Users should be educated about the risks of connecting to untrusted IMAP servers and the importance of keeping email clients updated. System administrators should implement strict access controls on email server configurations to prevent unauthorized modifications that could enable this attack vector. The vulnerability also highlights the importance of input validation and bounds checking in client-side applications, particularly those handling network protocol data. Organizations should conduct vulnerability assessments to identify other legacy email clients that may contain similar buffer overflow conditions, as this represents a common class of security flaw in older software implementations. Regular security audits of email infrastructure and client configurations remain essential to prevent exploitation of similar vulnerabilities in other email applications and protocols.