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CVE-2025-9817: Denial of Service Vulnerability in Wireshark SSH Dissector

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Overview

This report discusses a significant vulnerability, CVE-2025-9817, found in the SSH dissector of Wireshark versions 4.4.0 to 4.4.8. This vulnerability could potentially lead to system compromise or data leakage, posing severe risks to any organization utilizing the affected versions of Wireshark. With a CVSS Severity Score of 7.8, it is essential to take immediate action to mitigate these risks.

Vulnerability Summary

CVE ID: CVE-2025-9817
Severity: High (CVSS: 7.8)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Denial of service leading to potential system compromise or data leakage

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Product | Affected Versions

Wireshark | 4.4.0 to 4.4.8

How the Exploit Works

The vulnerability arises from a flaw in the SSH dissector of Wireshark. Specific types of network traffic can trigger this flaw, causing Wireshark to crash. This disruption in service could be leveraged by an attacker to compromise the system or gain unauthorized access to sensitive data.

Conceptual Example Code

Here is a conceptual example of how this vulnerability might be exploited. The attacker sends a malicious SSH packet that triggers the vulnerability and causes a crash. This example is not a working exploit, but a simplified representation of the attack.

ssh -p [target_port] -o ProxyCommand="echo [malicious_payload] | nc [target_ip] %p" [username]@[target_ip]

Mitigation Guidance

To mitigate the risks associated with this vulnerability, users should immediately apply the vendor patch. If the patch cannot be applied immediately, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. It is also advisable to monitor network traffic for any abnormal SSH packets, which could be an indication of an attempted exploit.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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