CVE-2019-19129 in Webmail Pro
Summary
by MITRE
Afterlogic WebMail Pro 8.3.11, and WebMail in Afterlogic Aurora 8.3.11, allows Remote Stored XSS via an attachment name.
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Analysis
by VulDB Data Team • 11/27/2019
The vulnerability identified as CVE-2019-19129 represents a critical remote stored cross-site scripting flaw discovered in Afterlogic WebMail Pro 8.3.11 and WebMail in Afterlogic Aurora 8.3.11. This vulnerability arises from insufficient input validation and output sanitization mechanisms within the email attachment handling functionality. The flaw allows malicious actors to inject malicious scripts into attachment names that are then stored on the server and subsequently executed when other users view the email interface. The vulnerability specifically affects the way the application processes and displays attachment metadata, creating an attack surface where user-controllable input can be manipulated to deliver malicious payloads. This issue falls under the CWE-79 category of Cross-Site Scripting, which is a fundamental web application security weakness that enables attackers to execute scripts in the context of other users. The vulnerability demonstrates a classic stored XSS pattern where the malicious payload is permanently stored on the server and executed whenever the affected page is loaded, making it particularly dangerous as it can affect multiple users over time.
The technical exploitation of this vulnerability occurs when an attacker sends an email with a maliciously crafted attachment name containing XSS payloads. The attachment name is typically displayed in the email interface without proper sanitization, allowing the malicious script to execute in the victim's browser context. This type of attack leverages the trust relationship between the web application and its users, enabling the execution of arbitrary code that could steal session cookies, redirect users to malicious sites, or perform actions on behalf of the victim. The vulnerability is particularly concerning because it requires minimal user interaction beyond receiving the malicious email, and the payload executes automatically when the email interface is accessed. The attack vector operates through the standard email attachment handling mechanism, making it difficult to detect and prevent through traditional network monitoring approaches. The security implications extend beyond simple script execution as the vulnerability can be used to escalate privileges, access sensitive information, or establish persistent backdoors within the email system.
The operational impact of CVE-2019-19129 extends significantly beyond immediate script execution, as it compromises the integrity of the entire email communication system. Organizations using affected versions of Afterlogic WebMail Pro or Aurora face potential data breaches, unauthorized access to email accounts, and possible lateral movement within their network infrastructure. The vulnerability can be exploited to create persistent threats that remain active until the malicious attachment names are manually removed or the application is patched. Attackers can leverage this vulnerability to harvest user credentials, monitor email communications, or deploy additional malware through the compromised email system. The impact is particularly severe in enterprise environments where email systems serve as critical communication channels and contain sensitive business information. The vulnerability also affects the overall security posture by potentially enabling more sophisticated attacks such as credential theft, privilege escalation, or as a stepping stone for broader network infiltration. Organizations may experience service disruption, regulatory compliance violations, and reputational damage if this vulnerability is exploited successfully, as the attack can remain undetected for extended periods.
Mitigation strategies for CVE-2019-19129 should prioritize immediate patching of affected systems to address the root cause of the vulnerability. Organizations should implement robust input validation and output encoding mechanisms to prevent malicious content from being stored or executed within the application. The security controls should include proper sanitization of all user-controllable input, particularly attachment names, and the implementation of content security policies to restrict script execution. Network administrators should deploy intrusion detection systems to monitor for suspicious attachment name patterns and implement email filtering solutions that can detect and quarantine potentially malicious attachments. The application should be configured to sanitize and escape all attachment metadata before display, ensuring that any HTML or script content is rendered harmless. Organizations should also consider implementing web application firewalls to provide additional layers of protection against XSS attacks. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities within the email infrastructure and other web applications. The remediation process should include thorough testing of the patch to ensure that legitimate functionality remains intact while the vulnerability is eliminated. Security teams should also establish monitoring procedures to detect potential exploitation attempts and maintain detailed logs of email attachment handling activities for forensic analysis purposes. This vulnerability highlights the importance of maintaining up-to-date security patches and implementing comprehensive input validation across all web application components to prevent similar issues from occurring in the future.