CVE-2017-9518 in Atmail
Summary
by MITRE
atmail before 7.8.0.2 has CSRF, allowing an attacker to change the SMTP hostname and hijack all emails.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 10/14/2019
The vulnerability identified as CVE-2017-9518 affects atmail versions prior to 7.8.0.2 and represents a critical cross-site request forgery flaw that enables attackers to manipulate email system configurations. This vulnerability resides within the web-based administrative interface of the atmail email server software, which is widely used for enterprise email management and collaboration. The flaw specifically targets the configuration settings related to Simple Mail Transfer Protocol hostname parameters, creating a significant security risk for organizations relying on this email infrastructure. The vulnerability classification aligns with CWE-352, which defines cross-site request forgery as a weakness where the application fails to validate that requests originate from legitimate sources, allowing malicious actors to perform unauthorized actions on behalf of authenticated users.
The technical implementation of this CSRF vulnerability occurs when administrators access the atmail web interface to modify email server settings. Attackers can craft malicious web pages or exploit existing user sessions to submit forged requests that alter the SMTP hostname configuration without proper authentication or authorization checks. This particular flaw allows attackers to redirect all outgoing email traffic through a malicious mail server they control, effectively enabling email hijacking and potential data exfiltration. The vulnerability exploits the absence of proper anti-CSRF tokens in the administrative forms, making it particularly dangerous as it requires no specialized knowledge of the underlying system architecture to exploit successfully. The attack vector typically involves tricking an authenticated administrator into visiting a malicious website that automatically submits configuration changes to the atmail server, leveraging the administrator's existing session and privileges.
The operational impact of this vulnerability extends far beyond simple configuration changes, as it fundamentally compromises the integrity and confidentiality of email communications within affected organizations. When an attacker successfully hijacks the SMTP hostname, all outgoing emails from the compromised atmail system are redirected through their controlled mail server, potentially allowing for eavesdropping, message manipulation, or complete interception of sensitive communications. This vulnerability creates a persistent backdoor for attackers to monitor and control email traffic, making it particularly dangerous for organizations handling confidential data, financial transactions, or proprietary information. The attack can remain undetected for extended periods, as the compromised system continues to function normally while silently redirecting email traffic. Organizations may experience data loss, regulatory compliance violations, and reputational damage when email communications are compromised through this vulnerability, with potential impacts extending to business continuity and customer trust.
Organizations should immediately implement multiple layers of defense to mitigate this vulnerability, beginning with the immediate upgrade to atmail version 7.8.0.2 or later, which includes proper CSRF protection mechanisms. Network segmentation and access controls should be implemented to limit administrative access to the atmail web interface, reducing the attack surface and ensuring that only authorized personnel can access sensitive configuration settings. The implementation of web application firewalls and security monitoring systems can help detect and prevent unauthorized configuration changes by monitoring for suspicious patterns in administrative requests. Additionally, organizations should enforce strict session management policies, including regular session token rotation and timeout mechanisms, to minimize the window of opportunity for attackers to exploit this vulnerability. Security awareness training for administrators should emphasize the importance of verifying the legitimacy of web pages and avoiding suspicious links, as social engineering remains a common method for delivering CSRF attacks. The mitigation strategy should also include regular security audits and penetration testing to identify and remediate similar vulnerabilities in other components of the email infrastructure, ensuring comprehensive protection against evolving attack techniques.