CVE-2017-1000169 in QuickerBB
Summary
by MITRE
QuickerBB version <= 0.7.2 is vulnerable to arbitrary file writes which can lead to remote code execution. This can lead to the complete takeover of the server hosting QuickerBB.
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Analysis
by VulDB Data Team • 01/10/2023
QuickerBB version 0.7.2 and earlier contains a critical vulnerability that allows attackers to perform arbitrary file writes, creating a pathway for remote code execution and full server compromise. This vulnerability stems from insufficient input validation and inadequate file handling mechanisms within the application's core functionality. The flaw exists in the way the software processes user-supplied data when creating or modifying files, enabling malicious actors to manipulate the file system through crafted inputs that bypass normal security controls.
The technical implementation of this vulnerability involves a classic path traversal and file write primitive that allows attackers to specify arbitrary file paths and content during the application's file operations. When QuickerBB processes user input for file creation or modification, it fails to properly sanitize or validate the destination paths, enabling attackers to write files to locations outside of intended directories. This weakness falls under CWE-22 Path Traversal and CWE-73 Path Traversal, both of which are fundamental security flaws that have been consistently exploited across various web applications. The vulnerability can be leveraged through multiple attack vectors including file upload functionality, configuration file manipulation, or direct file write operations within the application's API endpoints.
From an operational perspective, this vulnerability represents a severe threat to system integrity and data security as it provides attackers with the capability to execute arbitrary code on the target server with the privileges of the web application process. Successful exploitation allows attackers to establish persistent access, install backdoors, exfiltrate sensitive data, or use the compromised server as a launch point for further attacks within the network. The impact extends beyond immediate code execution to include complete system compromise, as attackers can manipulate system files, install malicious software, or modify application behavior to maintain long-term access. This vulnerability directly maps to ATT&CK technique T1059 Command and Scripting Interpreter and T1078 Valid Accounts, as it enables attackers to execute commands and potentially escalate privileges.
The mitigation strategy for this vulnerability requires immediate patching of the QuickerBB application to version 0.7.3 or later, which contains the necessary input validation and file handling improvements. Organizations should also implement network-level restrictions such as firewall rules that limit access to the application's file manipulation endpoints and restrict write permissions for the web application user account. Additionally, deploying web application firewalls and implementing proper input sanitization measures can provide defense-in-depth protection against similar vulnerabilities. System administrators should conduct thorough security assessments to identify any potential compromise indicators and implement monitoring solutions that can detect unauthorized file modifications or suspicious file write activities. The vulnerability demonstrates the critical importance of proper input validation and the principle of least privilege in preventing arbitrary file write operations that can lead to complete system compromise.