Description
x3270 before 3.3.12ga12 does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
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 | ibm-3270 | 3.3.14ga11-1 | — |
| Debian 13 | ibm-3270 | 3.3.14ga11-1 | — |
| Debian 12 | ibm-3270 | 3.3.14ga11-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ibm-3270 | No fix yet | — |
| Ubuntu 26.04 LTS | ibm-3270 | No fix yet | — |
| Ubuntu 25.10 | ibm-3270 | No fix yet | — |
| Ubuntu 24.04 LTS | ibm-3270 | No fix yet | — |
| Ubuntu 22.04 LTS | ibm-3270 | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | ibm-3270 | No fix yet | — |
| Ubuntu 18.04 LTS | ibm-3270 | No fix yet | — |
References
- 52650 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=889373
- 91572 vdb-entry
- http://sourceforge.net/projects/x3270/files/x3270/3.3.12ga12/
- x3270-cve20125662-spoofing(82984) vdb-entry