CVE-2006-5607 in Im-204 Adsl Router
Summary
by MITRE
Directory traversal vulnerability in /cgi-bin/webcm in INCA IM-204 allows remote attackers to read arbitrary files via a "/./." (modified dot dot) sequences in the getpage parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The vulnerability identified as CVE-2006-5607 represents a critical directory traversal flaw within the INCA IM-204 device's web management interface. This issue affects the /cgi-bin/webcm script where the getpage parameter fails to properly validate user input, creating an opportunity for remote attackers to access arbitrary files on the system. The exploitation technique involves crafting malicious requests using modified dot dot sequences such as "/./." which bypass conventional path validation mechanisms. This vulnerability falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as Path Traversal or Directory Traversal. The attack vector leverages the device's web interface to execute unauthorized file access operations, potentially exposing sensitive system information, configuration files, and critical data stored within the device's file system.
The technical implementation of this vulnerability stems from inadequate input sanitization within the web management interface of the INCA IM-204 router. When the getpage parameter receives input containing modified dot dot sequences, the application fails to properly normalize or validate the path specification before processing. This allows attackers to manipulate the file access routines to navigate beyond the intended directory boundaries and access files that should remain restricted. The specific use of "/./." sequences demonstrates a sophisticated approach to bypassing basic path validation checks that might only look for standard "../" patterns. This type of attack aligns with the ATT&CK technique T1566.001 which involves the exploitation of vulnerabilities in remote services to gain unauthorized access to systems and their resources.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the capability to access sensitive system files that may contain authentication credentials, configuration data, or system logs. Remote attackers can leverage this vulnerability to escalate privileges and potentially gain full control over the device, as the access to system files often includes the ability to modify critical configurations or extract information that could be used for further attacks. The vulnerability's remote nature means that attackers do not require physical access to the device, making it particularly dangerous in networked environments where such devices may be exposed to the internet. This type of vulnerability directly violates the principle of least privilege and can lead to complete system compromise, as demonstrated by the ATT&CK technique T1078 which covers valid accounts and legitimate credentials for unauthorized access.
Mitigation strategies for CVE-2006-5607 should focus on implementing proper input validation and sanitization within the affected web application. The most effective approach involves normalizing all user-supplied paths before processing, ensuring that sequences such as "/./." are properly handled and rejected. Network segmentation and access control measures should be implemented to limit exposure of such management interfaces to trusted networks only. Regular security updates and patches should be applied to address known vulnerabilities, while monitoring systems should be configured to detect and alert on suspicious access patterns. The implementation of web application firewalls and input validation rules can provide additional protection against similar attacks. Organizations should also consider conducting regular vulnerability assessments and penetration testing to identify and remediate similar weaknesses in their network infrastructure devices, as this vulnerability demonstrates the importance of proper input validation in web applications and network device management interfaces.