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.
Affected Software
| 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 | * |
References
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
- http://marc.info/?l=bugtraq\u0026m=141576985122836\u0026w=2
- http://openwall.com/lists/oss-security/2013/11/08/3
- http://www.openssh.com/txt/gcmrekey.adv
- http://www.ubuntu.com/usn/USN-2014-1
- http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
- http://marc.info/?l=bugtraq\u0026m=141576985122836\u0026w=2
- http://openwall.com/lists/oss-security/2013/11/08/3
- http://www.openssh.com/txt/gcmrekey.adv
- http://www.ubuntu.com/usn/USN-2014-1