CVE-2012-10041 in WAN Emulator
Summary
by MITRE • 08/08/2025
WAN Emulator v2.3 contains two unauthenticated command execution vulnerabilities. The result.php script calls shell_exec() with unsanitized input from the pc POST parameter, allowing remote attackers to execute arbitrary commands as the www-data user. The system also includes a SUID-root binary named dosu, which is vulnerable to command injection via its first argument. An attacker can exploit both flaws in sequence to achieve full remote code execution and escalate privileges to root.
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Analysis
by VulDB Data Team • 08/09/2025
The WAN Emulator v2.3 vulnerability represents a critical security flaw that demonstrates the dangerous consequences of improper input validation and privilege management in network infrastructure software. This vulnerability exists within a network emulation tool designed to simulate various network conditions, making it particularly concerning for enterprise environments where such tools are commonly deployed. The system's architecture creates multiple attack vectors that, when exploited in sequence, can lead to complete system compromise. The vulnerability affects version 2.3 specifically, indicating that this was likely a known issue that persisted through development cycles without proper remediation.
The technical exploitation of this vulnerability occurs through two distinct but complementary attack vectors that demonstrate poor security practices in software development. The primary vulnerability exists in the result.php script which directly invokes shell_exec() function with unsanitized input from the pc POST parameter, creating a classic command injection vulnerability that maps directly to CWE-77. This flaw allows remote attackers to execute arbitrary system commands with the privileges of the www-data user, which typically represents the web server user context. The second vulnerability involves a SUID-root binary named dosu that is susceptible to command injection through its first argument, creating a privilege escalation pathway that aligns with CWE-276. The combination of these two flaws creates a complete attack chain where an attacker can first execute commands as the web server user and then escalate privileges to root access.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass full system compromise and potential data breach scenarios. Attackers can leverage these vulnerabilities to gain persistent access to network infrastructure, potentially using the compromised system as a foothold for further lateral movement within the network. The fact that the system operates with elevated privileges through the SUID binary means that successful exploitation results in complete administrative control over the target system. This vulnerability affects network administrators who may unknowingly deploy vulnerable software, creating a risk that can be exploited by adversaries without requiring any specialized knowledge of the underlying network architecture. The attack vector is particularly dangerous because it requires no authentication, making it accessible to any remote attacker with network access to the system.
The exploitation of this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, specifically covering techniques related to command and scripting interpreter execution through web shell deployment and privilege escalation using SUID binaries. The vulnerability demonstrates the importance of the principle of least privilege and proper input validation in security architecture. Organizations should implement network segmentation to limit access to vulnerable systems and deploy intrusion detection systems that can identify command injection attempts. The use of web application firewalls and input sanitization mechanisms would have prevented the initial command injection attack, while proper privilege management and regular security auditing could have identified the SUID binary vulnerability. System administrators should conduct regular vulnerability assessments and ensure that all network infrastructure tools are running patched versions to prevent exploitation of known vulnerabilities.
Mitigation strategies for this vulnerability require both immediate remediation and long-term architectural improvements to prevent similar issues. The immediate solution involves patching the vulnerable WAN Emulator software to version 2.4 or later, which should include proper input sanitization and removal of unnecessary SUID permissions. Organizations should implement network monitoring to detect suspicious command execution patterns and establish automated patch management processes to ensure timely updates. The SUID binary dosu should be removed or reconfigured to eliminate privilege escalation opportunities, and the web application should be hardened to prevent direct shell command execution. Additionally, implementing proper access controls and privilege separation would reduce the impact of any remaining vulnerabilities. Security teams should also consider implementing application whitelisting and regular security assessments to identify potential command injection vulnerabilities in other network infrastructure tools. The vulnerability serves as a reminder that network infrastructure tools often receive less security scrutiny than core applications, making them attractive targets for attackers seeking to establish persistent access to enterprise networks.