Overview
The recently discovered CVE-2023-41471 vulnerability exposes a critical weakness in copyparty v1.9.1. As a result of this vulnerability, an attacker within the local network can execute arbitrary code by delivering a specially crafted payload to the WEEKEND-PLANS function. Given the severity of potential system compromises or data leakage, this vulnerability warrants immediate attention and mitigation.
Vulnerability Summary
CVE ID: CVE-2023-41471
Severity: High (CVSS: 7.8)
Attack Vector: Local network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Copyparty | v1.9.1
How the Exploit Works
The vulnerability lies in the WEEKEND-PLANS function of copyparty v1.9.1. An attacker within the local network can exploit this vulnerability by sending a malicious payload. If successfully delivered, the payload triggers a Cross Site Scripting (XSS) event, allowing the attacker to execute arbitrary code on the server. This could lead to full system compromise or potential data leakage.
Conceptual Example Code
Here’s a simplified conceptual example of how the vulnerability might be exploited:
POST /WEEKEND-PLANS HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "<script>execute_arbitrary_code()</script>" }
In the example above, the “malicious_payload” could be a script that exploits the vulnerability, leading to arbitrary code execution.
Mitigation Guidance
Users are strongly advised to apply the vendor patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation, potentially detecting and blocking attempts to exploit this vulnerability.

