The ssl_do_connect function in common/server.c in HexChat before 2.10.2, XChat, and XChat-GNOME does not verify that the server hostname matches a domain name in the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ubuntu_linux | Canonical | 12.04 (including) | 12.04 (including) |
| Ubuntu_linux | Canonical | 14.04 (including) | 14.04 (including) |
| Ubuntu_linux | Canonical | 15.10 (including) | 15.10 (including) |
| Hexchat | Ubuntu | trusty | * |
| Hexchat | Ubuntu | upstream | * |
| Xchat | Ubuntu | precise | * |
| Xchat | Ubuntu | trusty | * |
| Xchat | Ubuntu | wily | * |
| Xchat-gnome | Ubuntu | precise | * |
| Xchat-gnome | Ubuntu | trusty | * |
| Xchat-gnome | Ubuntu | wily | * |
References
- http://hexchat.readthedocs.org/en/latest/changelog.html
- http://www.ubuntu.com/usn/USN-2945-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1081839
- https://github.com/hexchat/hexchat/commit/c9b63f7f9be01692b03fa15275135a4910a7e02d
- https://github.com/hexchat/hexchat/issues/524
- http://hexchat.readthedocs.org/en/latest/changelog.html
- http://www.ubuntu.com/usn/USN-2945-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1081839
- https://github.com/hexchat/hexchat/commit/c9b63f7f9be01692b03fa15275135a4910a7e02d
- https://github.com/hexchat/hexchat/issues/524