CVE-2018-7703 in SecurMail
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in SecurEnvoy SecurMail before 9.2.501 allows remote attackers to inject arbitrary web script or HTML via the mailboxid parameter to secmail/getmessage.exe.
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Analysis
by VulDB Data Team • 07/03/2024
The vulnerability identified as CVE-2018-7703 represents a critical cross-site scripting flaw within SecurEnvoy SecurMail version 9.2.400 and earlier, exposing organizations to potential remote code execution and data theft risks. This vulnerability specifically affects the web-based email client component that processes mailbox identifiers through the secmail/getmessage.exe endpoint, creating an attack surface where malicious actors can manipulate input parameters to inject malicious scripts. The flaw resides in the application's insufficient validation and sanitization of user-supplied data, particularly when processing the mailboxid parameter that flows directly into the web response without proper encoding or filtering mechanisms. Security researchers have classified this issue as a classic XSS vulnerability, which falls under CWE-79, representing one of the most prevalent and dangerous web application security flaws in the industry.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing script code within the mailboxid parameter and delivers it to unsuspecting users through phishing emails, social engineering campaigns, or compromised web pages. When a victim clicks the malicious link, the script executes within the victim's browser context, potentially stealing session cookies, redirecting users to malicious sites, or performing unauthorized actions on behalf of the authenticated user. The impact extends beyond simple script injection as attackers can leverage this vulnerability to establish persistent access to email accounts, exfiltrate sensitive information, or use the compromised session to perform administrative functions within the email system. This type of vulnerability directly aligns with ATT&CK technique T1566, which describes social engineering attacks that manipulate users into executing malicious code through deceptive means.
Organizations utilizing SecurEnvoy SecurMail versions prior to 9.2.501 face significant operational risks, as this vulnerability can be exploited without requiring authentication or specialized knowledge of the underlying system architecture. The attack vector is particularly dangerous because it can be delivered through simple email campaigns that require minimal technical expertise from threat actors. Security teams must recognize that this vulnerability represents a critical security gap that could allow attackers to compromise user sessions and access sensitive email communications, potentially leading to data breaches, credential theft, and further lateral movement within corporate networks. The vulnerability's persistence across multiple versions indicates a systemic issue in the application's input handling mechanisms, making it essential for organizations to implement immediate remediation measures while also conducting comprehensive security assessments of their email infrastructure.
The recommended mitigation strategy involves upgrading to SecurEnvoy SecurMail version 9.2.501 or later, which includes proper input validation and output encoding mechanisms that prevent malicious script injection. Organizations should also implement additional defensive measures including web application firewalls, content security policies, and regular security assessments of their email systems. Network segmentation and user education programs can provide additional layers of protection, though these measures are considered temporary until the core vulnerability is patched. Security teams should monitor for exploitation attempts through network traffic analysis and implement proper logging mechanisms to detect and respond to potential attacks. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and implementing robust input validation practices, as this flaw could have been prevented through proper security development lifecycle practices and adherence to secure coding standards. Organizations should also consider conducting penetration testing and vulnerability assessments to identify similar issues in other web applications within their infrastructure.