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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | openfortivpn | 1.12.0-1 | — |
| Debian 13 | openfortivpn | 1.12.0-1 | — |
| Debian 12 | openfortivpn | 1.12.0-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | openfortivpn | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP1 | openfortivpn | 1.12.0-bp151.3.3.1 | openSUSE-SU-2020:0305-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | openfortivpn | 1.17.1-1.1 | openSUSE-SU-2024:11118-1 |
| openSUSE Leap 15.1 | openfortivpn | 1.12.0-lp151.2.5.1 | openSUSE-SU-2020:0301-1 |
Advisories 3
- openSUSE-SU-2020:0305-1 Security update for openfortivpn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0301-1 Security update for openfortivpn SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11118-1 openfortivpn-1.17.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- https://github.com/adrienverge/openfortivpn/issues/536
- https://github.com/adrienverge/openfortivpn/commit/cd9368c6a1b4ef91d77bb3fdbe2e5bc34aa6f4c4
- openSUSE-SU-2020:0301 vendor-advisory
- openSUSE-SU-2020:0305 vendor-advisory
- FEDORA-2020-42eb8821db vendor-advisory
- FEDORA-2020-c96ab3c813 vendor-advisory
- FEDORA-2020-dcdffcc368 vendor-advisory
- https://github.com/adrienverge/openfortivpn/commit/6328a070ddaab16faaf008cb9a8a62439c30f2a8