CVE-2001-0020 in Content Services Switch
Summary
by MITRE
Directory traversal vulnerability in Arrowpoint (aka Cisco Content Services, or CSS) allows local unprivileged users to read arbitrary files via a .. (dot dot) attack.
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Analysis
by VulDB Data Team • 05/24/2019
The vulnerability identified as CVE-2001-0020 represents a critical directory traversal flaw within Cisco Content Services (formerly known as Arrowpoint) appliances that operates at the core of web application security. This weakness specifically affects the file system access controls implemented within the content delivery and web application firewall components of Cisco's security infrastructure. The vulnerability stems from insufficient input validation mechanisms that fail to properly sanitize user-supplied data when processing file paths, creating an exploitable condition where malicious requests can navigate beyond intended directories.
The technical implementation of this vulnerability allows unprivileged local users to manipulate file path references through the use of directory traversal sequences, specifically employing the ".." (dot dot) notation to move up directory levels. When the system processes these malformed path references without adequate validation, it permits access to files outside the designated application directories, potentially exposing sensitive system information, configuration files, or even system binaries. This flaw operates at the application layer and can be exploited through various attack vectors including web interface interactions, API calls, or direct protocol manipulation. The vulnerability is classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", which represents one of the most fundamental and persistent security weaknesses in web applications.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to access critical system components and potentially escalate privileges within the affected environment. Local users who cannot directly access system resources can leverage this weakness to read sensitive files that may contain authentication credentials, system configurations, or other confidential data. The attack surface is particularly concerning given that these appliances typically serve as critical components in enterprise security infrastructures, making them attractive targets for adversaries seeking to gain deeper access to network environments. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and potentially T1566 (Phishing with Social Engineering) if used to gather intelligence for broader attacks.
Mitigation strategies for CVE-2001-0020 should focus on implementing proper input validation and sanitization mechanisms at all points where user-supplied data enters the system. Organizations must ensure that all file path processing includes comprehensive validation to prevent directory traversal sequences from being processed. This includes implementing strict path normalization, validating file access against whitelisted directories, and employing proper access controls that prevent unauthorized file system access. Cisco released security advisories recommending immediate firmware updates and configuration changes to address this vulnerability. Network administrators should also implement monitoring solutions to detect anomalous file access patterns and consider network segmentation to limit potential lateral movement. The vulnerability highlights the importance of defense-in-depth strategies and proper secure coding practices in security appliance development, emphasizing that even seemingly simple flaws can have significant operational consequences when present in critical infrastructure components.