The HTTP Alternative Services feature in Mozilla Firefox before 37.0.1 allows man-in-the-middle attackers to bypass an intended X.509 certificate-verification step for an SSL server by specifying that server in the uri-host field of an Alt-Svc HTTP/2 response header.
| Software | From | Fixed in |
|---|---|---|
| canonical / ubuntu_linux | 12.04 | 12.04.x |
| canonical / ubuntu_linux | 14.10 | 14.10.x |
| canonical / ubuntu_linux | 14.04 | 14.04.x |
| opensuse / opensuse | 13.1 | 13.1.x |
| opensuse / opensuse | 13.2 | 13.2.x |
| mozilla / firefox | - | 37.0.x |