CVE-2007-1927 in CmailServer
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in signup.asp in CmailServer WebMail 5.3.4 and earlier allows remote attackers to inject arbitrary web script or HTML via the POP3Mail parameter.
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Analysis
by VulDB Data Team • 08/28/2018
The vulnerability identified as CVE-2007-1927 represents a critical cross-site scripting flaw within the CmailServer WebMail 5.3.4 and earlier versions. This security weakness resides in the signup.asp component of the webmail application, specifically in how it handles user input through the POP3Mail parameter. The flaw allows remote attackers to execute malicious web scripts or HTML code within the context of other users' browsers, potentially compromising the integrity of the webmail environment and the data of unsuspecting users. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is a fundamental web application security issue that has been consistently ranked among the top ten web application security risks by the OWASP project.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing script code and injects it through the POP3Mail parameter during the signup process. When the vulnerable web application processes this input without proper sanitization or output encoding, the malicious script gets executed within the browser of any user who views the affected page or interacts with the compromised data. The attack vector is particularly dangerous because it leverages the legitimate authentication mechanisms of the webmail system, allowing the malicious code to run with the privileges and permissions of the authenticated user. This vulnerability enables attackers to perform various malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious websites.
The operational impact of this vulnerability extends beyond simple script execution, as it can lead to complete compromise of user sessions and potential lateral movement within the network. Attackers can exploit this weakness to steal user credentials, access sensitive email communications, modify user accounts, or even gain access to backend systems through session manipulation. The vulnerability affects the confidentiality, integrity, and availability of the webmail service, potentially disrupting business operations and exposing organizations to significant data breach risks. According to ATT&CK framework, this vulnerability maps to T1566 (Phishing) and T1071.001 (Application Layer Protocol: Web Protocols) techniques, as it enables attackers to craft malicious web content that targets users through legitimate email services. Organizations using affected versions of CmailServer WebMail face potential exposure to sophisticated attack campaigns where attackers can leverage this vulnerability to establish persistent access to email accounts and corporate communication channels.
Mitigation strategies for CVE-2007-1927 require immediate action to address the root cause of the vulnerability. The primary solution involves upgrading to a patched version of CmailServer WebMail that properly sanitizes user input and implements proper output encoding for all parameters. Organizations should also implement input validation mechanisms that filter or escape special characters in user-supplied data before processing. Additionally, deploying web application firewalls and implementing Content Security Policies can provide additional layers of protection against XSS attacks. Regular security assessments and input validation testing should be conducted to ensure that similar vulnerabilities are not present in other components of the webmail system. Security teams should also monitor for exploitation attempts and maintain comprehensive logging of user activities to detect potential unauthorized access or data manipulation attempts. The vulnerability highlights the critical importance of input validation and output encoding practices in web application development, as recommended by both CWE guidelines and industry best practices for secure software development.