1. Introduction
BNBT EasyTracker Malformed GET Request Remote DoS is a denial-of-service vulnerability affecting BNBT EasyTracker, a BitTorrent Tracker Installer for Windows. Attackers can crash the application by sending specially crafted HTTP requests. This could disrupt services relying on the tracker software and cause downtime. Systems running vulnerable versions of BNBT EasyTracker are at risk. Impact to confidentiality is low, integrity is low, and availability is high.
2. Technical Explanation
The vulnerability occurs because BNBT EasyTracker does not properly validate HTTP requests. A malformed request containing only a colon (‘:’) in the header line causes an application crash. This can be exploited remotely to cause a denial of service. The vulnerability is tracked as CVE-2005-2806.
- Root cause: Missing input validation on HTTP requests allows malformed headers.
- Exploit mechanism: An attacker sends an HTTP GET request with a header line consisting only of ‘:’. This causes the application to crash due to improper handling of the invalid input.
- Scope: BNBT EasyTracker running on Windows platforms is affected.
3. Detection and Assessment
You can confirm vulnerability by checking the version of BNBT EasyTracker installed, or by attempting a test request.
- Quick checks: Check the application’s ‘About’ box for the version number.
- Scanning: Nessus plugin ID 14700 may detect this vulnerability. This is an example only.
- Logs and evidence: Application crash events in the Windows Event Viewer may indicate exploitation.
4. Solution / Remediation Steps
Currently there is no known solution for this vulnerability.
4.1 Preparation
- There are currently no dependencies or pre-requisites to consider. A roll back plan is to restore from backup.
- Change windows may be required depending on your organisation’s policies. Approval from a system administrator may be needed.
4.2 Implementation
- Step 1: Monitor the application for crashes and investigate any unexpected behaviour.
4.3 Config or Code Example
Before
After
4.4 Security Practices Relevant to This Vulnerability
Input validation is a key practice in preventing this type of vulnerability.
- Practice 1: Input validation can block unsafe data, such as malformed HTTP requests.
4.5 Automation (Optional)
No automation steps are currently available due to the lack of a solution.
5. Verification / Validation
- Re-test: Attempt to trigger the crash again with the same malformed request. If it does not crash, the issue is likely mitigated.
- Smoke test: Verify that legitimate users can still connect to and use the tracker service.
- Monitoring: Monitor application logs for unexpected errors or crashes.
6. Preventive Measures and Monitoring
Regular security assessments and patch management are important preventive measures.
- Baselines: Update a security baseline to include checks for known vulnerabilities in BitTorrent Tracker software.
- Pipelines: Implement SAST or DAST tools in your CI/CD pipeline to identify potential input validation issues.
- Asset and patch process: Establish a regular patch review cycle for all installed software, including BNBT EasyTracker.
7. Risks, Side Effects, and Roll Back
There are no known risks or side effects associated with monitoring the application.
- Risk or side effect 1: No known risks at this time.
- Roll back: Restore from backup if unexpected issues occur.
8. References and Resources
Links to resources related to this vulnerability.
- Vendor advisory or bulletin: No vendor advisory available at this time.
- NVD or CVE entry: https://nvd.nist.gov/vuln/detail/CVE-2005-2806
- Product or platform documentation relevant to the fix: No specific documentation available at this time.