The pkinit_server_return_padata function in plugins/preauth/pkinit/pkinit_srv.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 attempts to find an agility KDF identifier in inappropriate circumstances, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted Draft 9 request.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Kerberos_5 | Mit | * | 1.10.4 (excluding) |
| Red Hat Enterprise Linux 6 | RedHat | krb5-0:1.10.3-10.el6_4.1 | * |
| Krb5 | Ubuntu | hardy | * |
| Krb5 | Ubuntu | oneiric | * |
| Krb5 | Ubuntu | precise | * |
| Krb5 | Ubuntu | quantal | * |
| Krb5 | Ubuntu | upstream | * |
Potential Mitigations
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7527
- http://secunia.com/advisories/55040
- http://web.mit.edu/kerberos/www/krb5-1.10/
- https://github.com/krb5/krb5/commit/db64ca25d661a47b996b4e2645998b5d7f0eb52c
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7527
- http://secunia.com/advisories/55040
- http://web.mit.edu/kerberos/www/krb5-1.10/
- https://github.com/krb5/krb5/commit/db64ca25d661a47b996b4e2645998b5d7f0eb52c