CVE-2006-0730 in Dovecot
Summary
by MITRE
Multiple unspecified vulnerabilities in Dovecot before 1.0beta3 allow remote attackers to cause a denial of service (application crash or hang) via unspecified vectors involving (1) "potential hangs" in the APPEND command and "potential crashes" in (2) dovecot-auth and (3) imap/pop3-login. NOTE: vector 2 might be related to a double free vulnerability.
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Analysis
by VulDB Data Team • 07/19/2018
The vulnerability identified as CVE-2006-0730 represents a critical security flaw in Dovecot email server software prior to version 1.0beta3. This vulnerability encompasses multiple unspecified issues that collectively enable remote attackers to execute denial of service attacks against affected systems. The Dovecot project, widely recognized as a robust and secure mail server implementation, was found to contain serious stability issues that could be exploited without authentication. These vulnerabilities specifically target the application's handling of email protocol commands and authentication processes, creating potential vectors for system compromise through service disruption.
The technical exploitation of this vulnerability occurs through three primary attack vectors that demonstrate different aspects of the software's instability. The first vector involves "potential hangs" during the APPEND command execution, which suggests that malicious input could cause the mail server to become unresponsive or enter an infinite loop while processing email message additions. The second vector targets dovecot-auth, where the described "potential crashes" indicate that authentication processes could be disrupted through crafted input, potentially leading to application termination. The third vector affects the imap/pop3-login components, indicating that the login mechanisms for both internet message access protocol and post office protocol could be compromised through similar attack techniques. The note suggesting that vector 2 might be related to a double free vulnerability adds significant concern as double free conditions are classic exploitation targets that can lead to arbitrary code execution.
The operational impact of CVE-2006-0730 extends beyond simple service disruption to potentially compromise the entire email infrastructure of affected organizations. When remote attackers can cause application crashes or hangs, they effectively disable critical email services that organizations depend upon for communication. This vulnerability particularly affects email servers that handle high volumes of incoming and outgoing messages, as the hanging conditions could accumulate over time and eventually exhaust system resources. The authentication component vulnerability creates additional risk as it could prevent legitimate users from accessing their email accounts while potentially allowing attackers to consume system resources through repeated failed authentication attempts. Organizations running vulnerable Dovecot versions face significant operational risk including service outages, reduced productivity, and potential data access issues that could impact business continuity.
Mitigation strategies for CVE-2006-0730 require immediate attention through software updates and system hardening measures. The primary and most effective mitigation is upgrading to Dovecot version 1.0beta3 or later, which contains the necessary patches to address the identified stability issues. Organizations should also implement network-level protections including firewall rules that limit access to email server ports and monitor for suspicious authentication patterns. The vulnerability's nature suggests that input validation should be enhanced at multiple protocol layers, particularly around the APPEND command processing and authentication handling. Security monitoring should be implemented to detect unusual system behavior that might indicate exploitation attempts, including monitoring for process hangs or unexpected application restarts. Organizations should also consider implementing intrusion detection systems that can identify patterns consistent with the vulnerability exploitation vectors and establish incident response procedures for rapid remediation when such attacks are detected. The vulnerability aligns with CWE-122, which describes buffer overflow conditions, and potentially CWE-476, which covers null pointer dereference issues, while the denial of service characteristics map to ATT&CK technique T1499 for network disruption and service availability compromise.