CVE-2008-4049 in PPPoE Client
Summary
by MITRE
A certain ActiveX control in fwRemoteCfg.dll 3.3.3.1 in Friendly Technologies FriendlyPPPoE Client 3.0.0.57 allows remote attackers to execute arbitrary programs via arguments to the RunApp method.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2008-4049 represents a critical security flaw in the FriendlyPPPoE Client software suite developed by Friendly Technologies. This vulnerability specifically affects the fwRemoteCfg.dll component version 3.3.3.1 and manifests through an ActiveX control that exposes the RunApp method. The flaw allows remote attackers to execute arbitrary code on vulnerable systems by simply passing malicious arguments to this method, creating a significant attack surface that could be exploited from remote locations without requiring local system access or authentication.
The technical nature of this vulnerability stems from improper input validation within the ActiveX control's RunApp method implementation. When the method receives untrusted input parameters, it fails to properly sanitize or validate these inputs before executing them as system commands. This creates a classic command injection vulnerability where attacker-controlled data flows directly into system execution contexts. The vulnerability is particularly dangerous because it operates through the ActiveX control interface, which is commonly enabled in web browsers for enhanced functionality, making it accessible through web-based attack vectors. The flaw essentially allows attackers to bypass normal execution boundaries and run arbitrary programs with the privileges of the user running the vulnerable software.
The operational impact of CVE-2008-4049 extends beyond simple code execution, as it provides attackers with a persistent foothold within network environments. Once exploited, attackers can install backdoors, modify system configurations, escalate privileges, or establish persistent access to compromised systems. The vulnerability affects the broader PPPoE client ecosystem and could potentially be leveraged in conjunction with other attacks to compromise network infrastructure. The remote exploit capability means that attackers do not need physical access to target systems or knowledge of local network configurations, making this vulnerability particularly attractive for widespread exploitation campaigns. This type of vulnerability directly maps to attack patterns described in the MITRE ATT&CK framework under the execution and privilege escalation domains.
Security mitigations for this vulnerability should focus on immediate remediation through software updates provided by Friendly Technologies, as well as network-level protections. Organizations should implement strict ActiveX control restrictions in browser configurations, disable unnecessary ActiveX components, and apply network segmentation to limit potential attack propagation. The vulnerability demonstrates the importance of proper input validation and secure coding practices as outlined in CWE-77 and CWE-78 categories, which specifically address command injection and improper input sanitization flaws. Additionally, implementing application whitelisting policies and maintaining up-to-date security patches across all systems running vulnerable software will significantly reduce the risk of exploitation. The remediation approach should also include network monitoring for suspicious command execution patterns and regular security assessments to identify other potential ActiveX-based vulnerabilities in legacy systems.