CVE-2012-10046 in E-Mail Security Virtual Appliance
Summary
by MITRE • 08/08/2025
The E-Mail Security Virtual Appliance (ESVA) (tested on version ESVA_2057) contains an unauthenticated command injection vulnerability in the learn-msg.cgi script. The CGI handler fails to sanitize user-supplied input passed via the id parameter, allowing attackers to inject arbitrary shell commands. Exploitation requires no authentication and results in full command execution on the underlying system.
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Analysis
by VulDB Data Team • 08/09/2025
The E-Mail Security Virtual Appliance ESVA represents a critical security gateway designed to protect email communications from various threats including spam, malware, and phishing attacks. This appliance operates as a centralized security solution that processes email traffic and applies security policies to ensure network email safety. The specific version ESVA_2057, which was tested and found vulnerable, serves as a representative example of how email security appliances can contain fundamental security flaws that compromise entire network infrastructures. These appliances typically function as intermediate nodes in email delivery chains, filtering messages before they reach end users and providing administrative interfaces for security policy configuration and monitoring.
The vulnerability identified in the learn-msg.cgi script demonstrates a classic command injection flaw that stems from inadequate input validation and sanitization practices within the web application code. The CGI handler processes user-supplied input through the id parameter without implementing proper sanitization mechanisms or input filtering, creating an environment where malicious actors can inject arbitrary shell commands directly into the system's command execution pipeline. This particular flaw aligns with CWE-77, which specifically addresses command injection vulnerabilities where untrusted data is incorporated into system commands without proper validation or escaping mechanisms. The absence of authentication requirements for exploitation makes this vulnerability particularly dangerous as it can be leveraged by any remote attacker without prior credentials or access privileges.
The operational impact of this unauthenticated command injection vulnerability extends far beyond simple data compromise, as successful exploitation grants attackers complete control over the underlying system executing the ESVA appliance. This full command execution capability enables adversaries to perform actions such as accessing sensitive configuration files, modifying security policies, installing backdoors, or even escalating privileges to gain root access to the system. The vulnerability essentially provides a backdoor into the email security infrastructure, potentially allowing attackers to bypass all security controls implemented by the appliance and gain access to the email traffic that the appliance is specifically designed to protect. From an attack perspective, this vulnerability maps directly to ATT&CK technique T1059.001 for command and scripting interpreter, where adversaries leverage legitimate system tools to execute malicious commands and establish persistent access.
The implications of this vulnerability extend to broader security implications within email infrastructure protection, as compromised email security appliances can serve as staging points for more sophisticated attacks against the network. Organizations relying on ESVA appliances for email security may experience complete compromise of their email monitoring capabilities, potentially allowing attackers to exfiltrate sensitive communications or deploy malware through email channels. The lack of authentication requirements means that this vulnerability can be exploited through automated scanning tools, making it particularly attractive to threat actors seeking widespread exploitation across multiple systems. Security professionals should recognize that this vulnerability represents a fundamental failure in input validation practices that violates security best practices established in various security frameworks and standards, including those outlined in the OWASP Top Ten and NIST cybersecurity guidelines for secure coding practices. Mitigation strategies should include immediate patching of the affected appliance, implementing network segmentation to limit access to the appliance, and monitoring for suspicious command execution patterns that might indicate exploitation attempts.