CVE-2010-5337 in Webclient
Summary
by MITRE
IceWarp Webclient before 10.2.1 has XSS via an HTTP POST request: webmail/basic/ with the parameter _dlg[captcha][controller] is non-persistent in 10.1.3 and 10.2.0.
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Analysis
by VulDB Data Team • 10/01/2020
The vulnerability identified as CVE-2010-5337 affects the IceWarp Webclient email application version 10.2.0 and earlier, specifically exposing a cross-site scripting weakness in the webmail/basic/ endpoint. This security flaw allows attackers to inject malicious scripts through the _dlg[captcha][controller] parameter within HTTP POST requests, creating a persistent threat vector that could compromise user sessions and data integrity. The vulnerability represents a significant risk to organizations relying on IceWarp for email services, particularly given the widespread use of web-based email clients in corporate environments.
The technical implementation of this vulnerability stems from insufficient input validation and output sanitization within the IceWarp Webclient application. When the application processes the _dlg[captcha][controller] parameter from POST requests, it fails to properly escape or filter user-supplied data before rendering it in the web interface. This oversight creates an environment where malicious actors can craft specially formatted payloads that execute within the context of authenticated user sessions, potentially leading to session hijacking, data exfiltration, or privilege escalation. The vulnerability is categorized under CWE-79 as a cross-site scripting flaw, specifically manifesting as a non-persistent XSS variant that requires user interaction to be exploited.
From an operational perspective, this vulnerability poses substantial risks to enterprise security infrastructure and user privacy. Attackers could leverage this flaw to steal session cookies, access sensitive email communications, or manipulate user accounts without detection. The non-persistent nature of the vulnerability in versions 10.1.3 and 10.2.0 suggests that the attack must be delivered directly to the target user, typically through phishing campaigns or compromised webmail links. This characteristic aligns with ATT&CK technique T1566, specifically the use of spearphishing attachments or links, as the vulnerability requires user engagement to execute successfully. Organizations with multiple users accessing the IceWarp Webclient become particularly vulnerable, as a single compromised account could provide attackers with access to an entire user base.
The recommended mitigation strategy involves immediate deployment of the vendor-provided patch for IceWarp Webclient version 10.2.1, which addresses the input validation issues in the affected parameter. Additionally, organizations should implement comprehensive web application firewall rules to monitor and filter suspicious POST requests containing potentially malicious payloads. Network administrators should also consider implementing content security policies and input sanitization measures at the application level to prevent similar vulnerabilities from occurring in other webmail systems. The vulnerability demonstrates the critical importance of regular security updates and proper input validation practices in web applications, particularly those handling sensitive user data and providing email services to enterprise clients.