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CVE-2023-36673

7.3 · HIGH

An issue was discovered in Avira Phantom VPN through 2.23.1 for macOS.

Published Aug 9, 2023CWE-319EPSS 0.53%

Overview

CVE-2023-36673 is a high-severity vulnerability. It was published on August 9, 2023 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in Avira Phantom VPN through 2.23.1 for macOS. The VPN client insecurely configures the operating system such that all IP traffic to the VPN server's IP address is sent in plaintext outside the VPN tunnel, even if this traffic is not generated by the VPN client, while simultaneously using plaintext DNS to look up the VPN server's IP address. This allows an adversary to trick the victim into sending traffic to arbitrary IP addresses in plaintext outside the VPN tunnel. NOTE: the tunnelcrack.mathyvanhoef.com website uses this CVE ID to refer more generally to "ServerIP attack, combined with DNS spoofing, that can leak traffic to an arbitrary IP address" rather than to only Avira Phantom VPN.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpsirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015Reftunnelcrack.mathyvanhoef.com/details.htmlRefwww.avira.com/en/free-vpnRefpsirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015Reftunnelcrack.mathyvanhoef.com/details.htmlRefwww.avira.com/en/free-vpn

How CyberStrike helps

Frequently asked questions

What is CVE-2023-36673?

CVE-2023-36673 is a high-severity vulnerability. It was published on August 9, 2023 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2023-36673?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-36673?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-36673?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-36673 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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