UBUNTU-CVE-2023-36673

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Source
https://ubuntu.com/security/CVE-2023-36673
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2023-36673
Upstream
  • CVE-2023-36673
Withdrawn
2025-07-29T05:10:18Z
Published
2023-08-09T23:15:00Z
Modified
2025-07-14T06:46:22.512307Z
Severity
  • 7.3 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:22.04:LTS
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@8.20-1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

8.*
8.10-2build1
8.10-3
8.10-4
8.10-5
8.10-7
8.10-8
8.20-1

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
softether-vpn

Package

Name
softether-vpn
Purl
pkg:deb/ubuntu/softether-vpn@5.01.9674+git20200806+8181039+dfsg2-2build1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.01.9674+git20200806+8181039+dfsg2-2
5.01.9674+git20200806+8181039+dfsg2-2build1

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
Ubuntu:24.04:LTS
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@9.12-1build5?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.12-1
9.12-1build1
9.12-1build3
9.12-1build4
9.12-1build5

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
softether-vpn

Package

Name
softether-vpn
Purl
pkg:deb/ubuntu/softether-vpn@5.01.9674+git20200806+8181039+dfsg2-2build3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.01.9674+git20200806+8181039+dfsg2-2build1
5.01.9674+git20200806+8181039+dfsg2-2build2
5.01.9674+git20200806+8181039+dfsg2-2build3

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
Ubuntu:25.04
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@9.12-3?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.12-3

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
softether-vpn

Package

Name
softether-vpn
Purl
pkg:deb/ubuntu/softether-vpn@5.01.9674+git20200806+8181039+dfsg3-1?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.01.9674+git20200806+8181039+dfsg3-1

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
Ubuntu:Pro:16.04:LTS
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@7.06-2build2?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*
7.06-2build1
7.06-2build2

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
Ubuntu:Pro:18.04:LTS
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@7.08-3ubuntu0.18.04.2?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

7.*
7.08-1
7.08-2
7.08-3
7.08-3ubuntu0.18.04.1
7.08-3ubuntu0.18.04.2

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"
Ubuntu:Pro:20.04:LTS
openconnect

Package

Name
openconnect
Purl
pkg:deb/ubuntu/openconnect@8.05-1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

8.*
8.02-1build1
8.05-1

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-36673.json"