Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Avira | Phantom Vpn | <= 2.23.1 |
Related Weaknesses (CWE)
References
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
- https://tunnelcrack.mathyvanhoef.com/details.htmlExploitThird Party Advisory
- https://www.avira.com/en/free-vpnProduct
- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2023-0015
- https://tunnelcrack.mathyvanhoef.com/details.htmlExploitThird Party Advisory
- https://www.avira.com/en/free-vpnProduct
FAQ
What is CVE-2023-36673?
CVE-2023-36673 is a vulnerability with a CVSS score of 7.3 (HIGH). 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 plai...
How severe is CVE-2023-36673?
CVE-2023-36673 has been rated HIGH with a CVSS base score of 7.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-36673?
Check the references section above for vendor advisories and patch information. Affected products include: Avira Phantom Vpn.