CVE-2020-7043

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-02-27 · updated 2026-06-17
Weakness: CWE-295

Description

An issue was discovered in openfortivpn 1.11.0 when used with OpenSSL before 1.0.2. tunnel.c mishandles certificate validation because hostname comparisons do not consider '\0' characters, as demonstrated by a good.example.com\x00evil.example.com attack.

Affected products

Fedoraproject Fedora: 30, 31, 32
Openfortivpn Project Openfortivpn: before 1.12.0 — fixed in 1.12.0
openSUSE Backports Sle: 15.0-sp1
openSUSE Leap: 15.1

How to fix

Upgrade to a fixed version: Openfortivpn Project Openfortivpn 1.12.0. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00011.html
https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8
https://github.com/adrienverge/openfortivpn/commit/cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4
https://github.com/adrienverge/openfortivpn/issues/536
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CKNKSGBVYGRRVRLFEFBEKUEJYJR5LWOF/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FF6HYIBREQGATRM5COF57MRQWKOKCWZ3/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SRVVNXCNTNMPCIAZIVR4FAGYCSU53FNA/
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00011.html
https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8
https://github.com/adrienverge/openfortivpn/commit/cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4

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