CVE-2015-2230 in Zimbra Collaboration
Summary
by MITRE
Synacor Zimbra Collaboration Server 8.x before 8.7.0 has Reflected XSS in admin console.
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Analysis
by VulDB Data Team • 09/25/2023
The Synacor Zimbra Collaboration Server represents a widely deployed email and collaboration platform that serves as a critical component in enterprise communication infrastructure. This particular vulnerability affects versions 8.x prior to 8.7.0, specifically targeting the administrative console interface where privileged users manage system configuration and user accounts. The administrative console operates as a web-based interface that processes user input through HTTP parameters, making it susceptible to cross-site scripting attacks that can be exploited by malicious actors to compromise administrative sessions and gain unauthorized access to sensitive system controls.
The technical flaw manifests as a reflected cross-site scripting vulnerability that occurs when the administrative console fails to properly sanitize or encode user-supplied input before incorporating it into dynamic web responses. When an attacker crafts a malicious URL containing crafted script payloads and delivers it to an authenticated administrator, the server reflects this malicious content back to the victim's browser within the administrative interface. This vulnerability specifically impacts the server's handling of HTTP parameters in the admin console context, where user input is directly echoed without appropriate output encoding or validation mechanisms. The reflected nature of the vulnerability means that the malicious script code is executed in the victim's browser context without being stored on the server, making it particularly dangerous for targeted attacks against privileged users.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it provides attackers with the ability to perform administrative actions on behalf of legitimate users. An attacker who successfully exploits this vulnerability can manipulate email configurations, create or modify user accounts, access sensitive email content, and potentially escalate privileges within the system. The attack vector typically requires social engineering to convince an administrator to click on a malicious link, but once executed, the consequences can be severe as attackers gain access to the complete administrative interface. This vulnerability directly maps to CWE-79 which describes improper neutralization of input during web page generation, and aligns with ATT&CK technique T1059.007 for scripting and T1078.004 for valid accounts to maintain persistent access within compromised environments.
Mitigation strategies for this vulnerability require immediate patching to version 8.7.0 or later, which includes proper input validation and output encoding mechanisms for the administrative console. Organizations should implement additional security measures including restricting administrative access to trusted networks, implementing multi-factor authentication for administrative accounts, and conducting regular security awareness training for administrators to prevent social engineering attacks. Network segmentation and web application firewalls can provide additional layers of protection by monitoring and filtering malicious traffic patterns. Security monitoring should focus on detecting suspicious administrative activities and unusual access patterns that may indicate exploitation attempts. The vulnerability also highlights the importance of input validation in web applications and the necessity of following secure coding practices to prevent similar issues in other components of the system.