CVE-2010-3292 in Mailscanner
Summary
by MITRE
The update{_bad,}_phishing_sites scripts in mailscanner 4.79.11-2 downloads files and trusts them without using encryption (e.g., https) or digital signature checking which could allow an attacker to replace certain configuration files (e.g., phishing whitelist) via dns/packet spoofing.
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Analysis
by VulDB Data Team • 11/13/2019
The vulnerability identified as CVE-2010-3292 resides within the mailscanner 4.79.11-2 software suite, specifically affecting the update_bad_phishing_sites and update_phishing_sites scripts. These automated tools are designed to periodically download updated threat intelligence data to maintain an effective phishing protection system. The flaw manifests in the absence of cryptographic verification mechanisms during the file transfer process, creating a significant security gap that adversaries can exploit to compromise the integrity of the security configuration.
The technical implementation of this vulnerability stems from the scripts' reliance on unencrypted HTTP connections for downloading configuration files rather than employing secure HTTPS protocols or implementing digital signature verification. This design choice fundamentally undermines the trust model of the security system, as any attacker who can manipulate network traffic between the mailscanner system and the remote update servers can substitute legitimate configuration files with malicious ones. The vulnerability particularly affects phishing whitelist files that are critical for maintaining legitimate email traffic flow while blocking malicious content.
The operational impact of this vulnerability extends beyond simple data integrity concerns, as it provides attackers with a persistent vector for maintaining access to compromised systems. By replacing phishing whitelist files, adversaries can create a scenario where legitimate phishing emails are allowed through the security filters, effectively bypassing the protective measures that the mailscanner is designed to provide. This compromise can lead to successful phishing attacks, credential theft, and potential lateral movement within the compromised network environment. The vulnerability also affects the overall trustworthiness of the security monitoring system, as administrators may unknowingly rely on compromised configuration data.
From a cybersecurity framework perspective, this vulnerability aligns with CWE-310, which addresses cryptographic issues in software applications. The flaw represents a failure to implement proper cryptographic practices in the software's update mechanism, making it susceptible to man-in-the-middle attacks and traffic manipulation. The attack surface is further expanded when considering the MITRE ATT&CK framework's T1133, which covers external remote services, and T1566, which deals with credential harvesting through spearphishing. The vulnerability creates an ideal environment for attackers to execute more sophisticated attacks by first compromising the update mechanism and then leveraging the trust relationship established by the compromised configuration files.
The mitigation strategy for this vulnerability requires implementing secure communication protocols for all update mechanisms, specifically mandating HTTPS connections with proper certificate validation. Organizations should also implement digital signature verification for all downloaded configuration files to ensure their integrity and authenticity. Additionally, network segmentation and monitoring should be enhanced to detect unauthorized modifications to security configuration files. Regular security audits and penetration testing should be conducted to verify that update mechanisms are properly secured. The implementation of these controls addresses the core issue of trust verification and prevents attackers from exploiting the insecure download mechanisms that form the basis of this vulnerability.