The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Openssh | Openbsd | 6.2 (including) | 6.2 (including) |
| Openssh | Openbsd | 6.3 (including) | 6.3 (including) |
| Openssh | Ubuntu | devel | * |
| Openssh | Ubuntu | saucy | * |