Overview
This report discusses the critical vulnerability (CVE-2023-43692) identified in Malwarebytes, which specifically affects versions before 4.6.14.326 and before 5.1.5.116, as well as Nebula 2020-10-21 and later versions. The vulnerability is significant because it enables out-of-bound reads in string detection utilities, leading to potential system crashes and potential system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2023-43692
Severity: High (7.5 CVSS Severity Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: System crashes, potential system compromise, and data leakage
Affected Products
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Product | Affected Versions
Malwarebytes | Before 4.6.14.326
Malwarebytes | Before 5.1.5.116
Nebula | 2020-10-21 and later
How the Exploit Works
The exploit manipulates the string detection utilities of the affected Malwarebytes versions by inducing an out-of-bounds read. This mismanagement of the memory buffer can cause the system to crash, providing an opportunity for malicious actors to compromise the system or leak sensitive information.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This is not an actual code but a hypothetical representation to understand the nature of the exploit.
POST /malwarebytes/string-detection/utilities HTTP/1.1
Host: target.example.com
Content-Type: application/octet-stream
{ "malicious_string": "«Invalid memory reference exceeding buffer limits»" }This malicious request targets the string detection utilities, causing an out-of-bounds read that could lead to system crashes.
Mitigation Guidance
Users of the affected versions of Malwarebytes and Nebula are strongly advised to apply the vendor patch. If that is not immediately possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. However, these are just temporary solutions and may not completely protect the system from the exploit. Upgrading to a version beyond 4.6.14.326 for Malwarebytes, beyond 5.1.5.116 for Malwarebytes, or beyond 2020-10-21 for Nebula is the most reliable solution.
