CVE-2010-5339 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][uid] 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-2010-5339 affects the IceWarp Webclient email application version 10.2.0 and earlier, specifically targeting the webmail/basic/ endpoint where an HTTP POST request can be exploited to execute malicious scripts. This represents a classic cross-site scripting vulnerability that allows attackers to inject client-side scripts into web pages viewed by other users. The flaw manifests through the _dlg[captcha][uid] parameter which is processed without proper input validation or sanitization, creating an avenue for malicious actors to manipulate the application's behavior.
The technical implementation of this vulnerability stems from inadequate output encoding and input validation within the IceWarp Webclient's processing logic. When the application receives a POST request containing the _dlg[captcha][uid] parameter, it fails to properly sanitize or encode the input before incorporating it into the web page's HTML output. This oversight enables attackers to craft malicious payloads that execute within the context of other users' browsers, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability is classified as non-persistent in versions 10.1.3 and 10.2.0, suggesting that the developers identified and partially addressed the issue, though the original flaw remains present in earlier versions.
The operational impact of this vulnerability extends beyond simple script execution, as it can be leveraged to compromise user sessions and access sensitive email communications. An attacker could exploit this weakness by sending a specially crafted email with a malicious link or by directly injecting code through the vulnerable endpoint. The non-persistent nature of the vulnerability means that the malicious scripts would execute only once per user session, but the potential for widespread impact increases with the number of affected users. This vulnerability directly aligns with CWE-79 which describes Cross-Site Scripting flaws, and could be categorized under ATT&CK technique T1566 for initial access through spearphishing with a malicious attachment or link. The attack vector through webmail interfaces makes this particularly concerning for enterprise environments where email remains a primary communication channel.
Mitigation strategies for CVE-2010-5339 should focus on immediate patch deployment to version 10.2.1 or later where the vulnerability has been addressed. Organizations should implement comprehensive input validation and output encoding mechanisms throughout the application's codebase, particularly for parameters that are directly rendered in HTML output. Network administrators should consider implementing web application firewalls to detect and block suspicious POST requests containing known malicious patterns. Additionally, user education regarding suspicious email content and link verification remains crucial in preventing exploitation. The vulnerability demonstrates the importance of following secure coding practices such as those outlined in the OWASP Top Ten and ISO 27001 security standards, emphasizing that proper input sanitization and output encoding are fundamental requirements for preventing XSS attacks. Organizations should conduct regular security assessments to identify similar vulnerabilities in other web applications and ensure that all third-party software components are kept up to date with the latest security patches.