Overview
The cybersecurity community is currently facing a significant challenge with the discovery of a critical vulnerability, CVE-2024-55371, found in versions 2.38.2 and below of the Wallos software system. This vulnerability, which poses a severe threat to data integrity and system security, revolves around the software’s backup restore function. Authenticated users, even those without administrative privileges, can exploit this vulnerability by uploading a ZIP file containing malicious files, potentially leading to system compromise or data leakage.
The severity of this vulnerability is emphasized by its Common Vulnerability Scoring System (CVSS) severity score of 9.8, signifying an urgent need for mitigation. This post provides an in-depth technical summary of the vulnerability, its potential impact, and actionable mitigation strategies.
Vulnerability Summary
CVE ID: CVE-2024-55371
Severity: Critical (CVSS: 9.8)
Attack Vector: Network
Privileges Required: Low (Authenticated User)
User Interaction: Required
Impact: System Compromise, Data Leakage
Affected Products
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Product | Affected Versions
Wallos | <=2.38.2 How the Exploit Works
The exploit takes advantage of the “restore backup” function of Wallos. This function allows any authenticated user to upload and restore backups via a ZIP file. The contents of the ZIP file are then extracted directly on the server.
An attacker can manipulate this functionality by injecting malicious files into the ZIP file, such as a web shell. Once the web shell is uploaded and installed on the server, the attacker gains the ability to execute arbitrary commands, potentially leading to full system compromise or data leakage.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited:
POST /backup_restore HTTP/1.1
Host: vulnerable-wallos-server.com
Content-Type: application/zip
{ "backup_file": "<malicious_zip_file>" }In the above example, the malicious_zip_file is a ZIP file containing the web shell or other malicious payload. Once the file is uploaded and extracted on the server, the attacker can use the web shell to execute arbitrary commands.
Mitigation Guidance
The best course of action to mitigate the risk posed by this vulnerability is to apply the vendor-supplied patch. If a patch is not immediately available or applicable, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can help detect and prevent the uploading of malicious files, reducing the risk of exploitation.
Remember, early detection and prompt action are crucial to maintaining a secure infrastructure in the face of emerging vulnerabilities like CVE-2024-55371.