CVE-2017-11587 in DDR2200
Summary
by MITRE
On Cisco DDR2200 ADSL2+ Residential Gateway DDR2200B-NA-AnnexA-FCC-V00.00.03.45.4E and DDR2201v1 ADSL2+ Residential Gateway DDR2201v1-NA-AnnexA-FCC-V00.00.03.28.3 devices, there is directory traversal in the filename parameter to the /download.conf URI.
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Analysis
by VulDB Data Team • 01/06/2021
The vulnerability identified as CVE-2017-11587 affects Cisco DDR2200 ADSL2+ Residential Gateway devices, specifically the DDR2200B-NA-AnnexA-FCC-V00.00.03.45.4E and DDR2201v1-NA-AnnexA-FCC-V00.00.03.28.3 models. This directory traversal flaw exists within the web interface of these residential gateways, which are commonly deployed in home and small office environments to provide internet connectivity through ADSL2+ technology. The affected devices operate with web management interfaces that fail to properly validate input parameters, creating a security weakness that can be exploited by remote attackers to access unauthorized files on the device's file system.
The technical implementation of this vulnerability occurs through the /download.conf URI endpoint where the filename parameter is processed without adequate sanitization. When an attacker sends a malicious request containing directory traversal sequences such as ../ or ..\ in the filename parameter, the web server fails to validate the input properly and instead processes the request as if the user were attempting to access files in parent directories of the intended location. This flaw allows attackers to navigate beyond the intended file access boundaries and potentially read sensitive configuration files, system logs, or other confidential data stored on the device. The vulnerability is classified as a CWE-22 directory traversal issue, which represents a well-known weakness in input validation that enables attackers to access files outside of the intended directory structure.
The operational impact of this vulnerability is significant for users of these devices, as it provides unauthorized access to potentially sensitive information stored on the residential gateway. Attackers could potentially extract configuration files that might contain administrative credentials, network settings, or other sensitive data that could be used for further attacks against the local network. The vulnerability is particularly concerning because it affects residential gateways that are often deployed without proper network segmentation, making them potential entry points for attackers seeking to establish persistent access to home networks. This type of vulnerability aligns with ATT&CK technique T1213.002 for accessing data from network shares and T1083 for discovering files and directories, as it enables unauthorized file system enumeration and data extraction.
Mitigation strategies for this vulnerability should include immediate firmware updates from Cisco to address the directory traversal flaw, as well as network segmentation practices that isolate these devices from critical internal systems. Organizations should also implement network monitoring to detect suspicious requests to the affected URI and consider disabling unnecessary web management interfaces on these devices. The vulnerability demonstrates the importance of proper input validation in web applications and highlights the need for security testing of network device interfaces. Additionally, users should ensure that default credentials are changed and that only authorized personnel have access to the device management interfaces, as this vulnerability could potentially be combined with other weaknesses to achieve more comprehensive system compromise.