CVE-2016-10561 in Bitty
Summary
by MITRE
Bitty is a development web server tool that functions similar to `python -m SimpleHTTPServer`. Version 0.2.10 has a directory traversal vulnerability that is exploitable via the URL path in GET requests.
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Analysis
by VulDB Data Team • 02/10/2020
The vulnerability identified as CVE-2016-10561 affects Bitty, a lightweight web server tool designed for development purposes that mimics the functionality of Python's SimpleHTTPServer module. This tool is commonly used by developers for quickly serving files from a local directory during application development and testing phases. The vulnerability exists in version 0.2.10 and represents a critical security flaw that can be exploited through manipulation of URL path parameters in HTTP GET requests. The tool's design philosophy of simplicity and ease of use unfortunately creates a security gap that can be readily exploited by malicious actors.
The technical flaw manifests as a directory traversal vulnerability that allows attackers to access files outside the intended document root directory. When processing GET requests, Bitty fails to properly sanitize or validate URL path parameters, enabling attackers to construct malicious paths using sequences such as ../ or ..\ that would normally be restricted by proper path validation mechanisms. This vulnerability directly maps to CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The vulnerability occurs because the application does not implement adequate input validation or canonicalization of file paths before serving content, allowing arbitrary file access to occur.
The operational impact of this vulnerability is significant for developers who use Bitty in environments where security is not properly considered. Attackers can leverage this weakness to access sensitive files such as configuration files, source code, database files, or other system resources that should remain protected. The vulnerability is particularly dangerous because it can be exploited remotely through web browser access, meaning that any user who can reach the Bitty server can potentially access unauthorized files. This creates a scenario where development environments become attack vectors that can expose confidential information, potentially leading to data breaches or further exploitation of the underlying system. The vulnerability is especially concerning in shared development environments or when Bitty is deployed on systems with access to sensitive data.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected version to the latest release where the directory traversal issue has been resolved. Organizations should also implement network segmentation to limit access to development servers, ensuring that only authorized personnel can reach the Bitty service. Additionally, administrators should consider deploying proper access controls and authentication mechanisms to prevent unauthorized access to the web server. The vulnerability demonstrates the importance of validating all user inputs, particularly in development tools that are often deployed without proper security hardening. Security practices should include regular vulnerability scanning of development environments and ensuring that all tools used in the development lifecycle are kept up to date with the latest security patches. From an ATT&CK perspective, this vulnerability aligns with techniques such as T1083 (File and Directory Discovery) and T1566 (Phishing), as attackers can use the vulnerability to discover and exfiltrate sensitive files from development systems.