CVE-2008-4048 in PPPoE Client
Summary
by MITRE
Heap-based buffer overflow in 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 code via a long third argument to the CreateURLShortcut method.
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Analysis
by VulDB Data Team • 11/03/2024
The vulnerability identified as CVE-2008-4048 represents a critical heap-based buffer overflow within the fwRemoteCfg.dll component of Friendly Technologies FriendlyPPPoE Client version 3.0.0.57. This flaw exists in an ActiveX control that is designed to facilitate remote configuration capabilities for PPPoE connections. The vulnerability specifically manifests when processing user-supplied input through the CreateURLShortcut method, where the third parameter is not properly validated or sanitized before being copied into a fixed-size heap buffer. This improper input handling creates an exploitable condition that can be leveraged by remote attackers to execute arbitrary code on vulnerable systems. The heap-based nature of this buffer overflow means that the vulnerability occurs in dynamically allocated memory regions, making exploitation more complex but potentially more reliable than stack-based counterparts.
The technical implementation of this vulnerability stems from inadequate bounds checking within the ActiveX control's method implementation. When the CreateURLShortcut method receives a third argument that exceeds the predetermined buffer size allocated for it, the excess data overflows into adjacent memory locations, potentially corrupting critical program state information. This overflow can overwrite return addresses, function pointers, or other control data structures, enabling attackers to redirect program execution flow to malicious code injected into the heap memory. The vulnerability's remote exploitability is facilitated by the ActiveX control's integration with web browsers, allowing attackers to deliver malicious payloads through web pages that invoke the vulnerable method. This attack vector aligns with common techniques described in the ATT&CK framework under the T1203 category for exploitation of remote services and T1059 for execution through scripting languages.
The operational impact of CVE-2008-4048 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and persistent access for attackers. The vulnerability affects systems running the specific version of FriendlyPPPoE Client software, making it particularly dangerous in environments where this particular client software is deployed. Organizations may experience unauthorized access to network resources, data exfiltration, or use of compromised systems for further attacks within their network infrastructure. The vulnerability's exploitation requires minimal user interaction, as the ActiveX control can be triggered through web browsing, making it particularly effective for drive-by download attacks. The presence of this vulnerability in a network infrastructure client software means that attackers can potentially gain access to network configuration information and establish persistent backdoors through the compromised client systems.
Mitigation strategies for CVE-2008-4048 should focus on immediate software updates and security hardening measures. The most effective solution involves upgrading to a patched version of FriendlyPPPoE Client software that addresses the buffer overflow condition through proper input validation and bounds checking. Organizations should implement browser security configurations that disable ActiveX controls or restrict their execution to trusted sites only, following security best practices outlined in industry standards such as those recommended by the National Institute of Standards and Technology. Network segmentation and monitoring should be implemented to detect potential exploitation attempts, as the vulnerability may leave detectable traces in network traffic or system logs. Additionally, security awareness training for administrators and users can help prevent accidental exploitation through malicious web content. The vulnerability demonstrates the importance of proper software security practices and input validation, aligning with CWE-121 which describes heap-based buffer overflow conditions and emphasizes the need for robust memory management in software development processes.