CVE-2007-3786 in InstaGate EX2 UTM
Summary
by MITRE
** DISPUTED ** Cross-site request forgery (CSRF) vulnerability on the eSoft InstaGate EX2 UTM device before firmware 3.1.20070615 allows remote attackers to perform privileged actions as administrators. NOTE: the vendor disputes the distribution of the vulnerable software, stating that it was a custom build for a former customer.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 08/08/2024
The CVE-2007-3786 vulnerability represents a cross-site request forgery flaw identified in the eSoft InstaGate EX2 Unified Threat Management device. This vulnerability specifically affects firmware versions prior to 3.1.20070615 and operates within the context of web-based administrative interfaces that lack proper CSRF protection mechanisms. The flaw enables remote attackers to execute privileged operations with administrative privileges by exploiting the absence of anti-CSRF tokens or validation checks in the device's web management interface. The vulnerability's classification under CWE-352 indicates a fundamental weakness in the application's security controls where it fails to validate the origin of requests submitted through web forms or API endpoints. This particular device operates as a network security appliance that provides unified threat management services including firewall, intrusion prevention, and content filtering capabilities, making it a critical component in enterprise network security infrastructure.
The technical exploitation of this CSRF vulnerability occurs when an attacker crafts a malicious web page or email attachment that, when visited or opened by an authenticated administrator, automatically submits requests to the vulnerable InstaGate EX2 device. The attack leverages the fact that web browsers automatically include authentication cookies with requests to the target domain, allowing the malicious request to appear as if it originated from a legitimate administrator session. Without proper CSRF token validation, the device processes these unauthorized requests as if they were legitimate administrative commands, potentially enabling attackers to modify firewall rules, change administrative passwords, or perform other privileged operations that could compromise the entire network security posture. The vulnerability's impact is amplified by the fact that the administrative interface typically requires no additional authentication factors beyond session cookies, making it particularly susceptible to this type of attack vector.
The operational impact of this vulnerability extends beyond simple privilege escalation as it represents a critical security weakness in network infrastructure devices that are often deployed in sensitive environments. Organizations relying on the InstaGate EX2 for their unified threat management would face significant risk exposure if this vulnerability were exploited, potentially allowing attackers to gain complete control over network security policies and configurations. The vendor's dispute regarding the distribution of vulnerable software suggests that this may have been limited to specific customer deployments or custom builds rather than widespread distribution, but the underlying security flaw remains valid and potentially exploitable in any environment where the vulnerable firmware is present. This vulnerability aligns with ATT&CK technique T1566.002 which focuses on credential access through social engineering and web-based attacks, specifically targeting administrative interfaces to gain elevated privileges.
Mitigation strategies for this vulnerability primarily involve updating the firmware to version 3.1.20070615 or later, which would include the necessary CSRF protection mechanisms. Network administrators should also implement additional security controls such as restricting administrative access to specific IP addresses, implementing multi-factor authentication for administrative interfaces, and monitoring for unusual administrative activities that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper input validation and anti-CSRF token implementation in web applications, particularly those managing critical infrastructure components. Security teams should also conduct comprehensive audits of all network security appliances to identify any other potential CSRF vulnerabilities and ensure that all devices are running supported firmware versions with appropriate security patches applied. The incident highlights the need for robust security testing and validation of custom builds before deployment in production environments, as the vendor's statement about this being a custom build for a former customer suggests that proper quality assurance processes may have been bypassed during the development phase.