CVE-2009-4404 in t-prot
Summary
by MITRE
Unspecified vulnerability in t-prot (TOFU Protection) before 2.8 allows remote attackers to cause a denial of service via unspecified vectors related to the "--maxlines" option and a crafted email message. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 01/25/2019
The vulnerability identified as CVE-2009-4404 affects t-prot, a TOFU Protection system designed to safeguard against certain email-based attacks. This unspecified weakness exists in versions prior to 2.8 and represents a significant security concern for organizations relying on email protection mechanisms. The vulnerability specifically relates to how the system handles the "--maxlines" command-line option when processing email messages, creating a potential pathway for remote attackers to disrupt service operations. The flaw demonstrates the critical importance of proper input validation and resource management in security tools that process untrusted data from external sources.
The technical implementation of this vulnerability stems from inadequate handling of email message processing when the "--maxlines" parameter is utilized. Attackers can craft specially formatted email messages that, when processed by t-prot, trigger unexpected behavior in the system's line counting or message parsing mechanisms. This typically manifests as resource exhaustion, memory corruption, or process termination that results in complete service disruption. The vulnerability's classification as a denial of service issue indicates that successful exploitation leads to the unavailability of the protected email services, potentially affecting legitimate users and business operations. From a cybersecurity perspective, this represents a classic example of improper input validation where external data is not adequately sanitized before processing, creating opportunities for resource exhaustion attacks that fall under the broader category of denial of service vulnerabilities.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the overall email security infrastructure. Organizations using affected versions of t-prot may experience complete email service outages, which can have cascading effects on business operations, communication workflows, and customer service delivery. The remote nature of the attack means that adversaries can exploit this weakness without requiring physical access or local privileges, making it particularly dangerous for networked environments. Security teams must consider that this vulnerability could be exploited as part of broader attack campaigns targeting email infrastructure, potentially serving as a stepping stone for more sophisticated attacks. The vulnerability also highlights the importance of keeping security tools updated, as the issue was resolved in version 2.8, demonstrating the critical need for regular patch management and vulnerability assessment programs.
Mitigation strategies for CVE-2009-4404 primarily focus on immediate remediation through version upgrades to t-prot 2.8 or later, which contains the necessary patches to address the problematic handling of the "--maxlines" option. Organizations should also implement additional monitoring and logging to detect unusual patterns in email processing that might indicate exploitation attempts. Network segmentation and access controls can help limit the potential impact if the vulnerability is exploited, while regular security assessments should be conducted to identify similar weaknesses in other email protection systems. From a compliance standpoint, this vulnerability aligns with various security frameworks that emphasize the importance of timely patch management and proper input validation. The issue also relates to attack techniques documented in the MITRE ATT&CK framework under the denial of service category, specifically highlighting the importance of protecting against resource exhaustion attacks that can render systems unavailable to legitimate users. Organizations should also consider implementing email filtering rules and content inspection mechanisms that can detect and block malformed email messages before they reach the vulnerable t-prot system, providing an additional layer of defense against such attacks.