The acc_ctx_cont function in the SPNEGO acceptor in lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5.x through 1.12.x before 1.12.2 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via an empty continuation token at a certain point during a SPNEGO negotiation.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Debian_linux | Debian | 7.0 (including) | 7.0 (including) |
| Red Hat Enterprise Linux 5 | RedHat | krb5-0:1.6.1-78.el5 | * |
| Red Hat Enterprise Linux 6 | RedHat | krb5-0:1.10.3-33.el6 | * |
| Red Hat Enterprise Linux 7 | RedHat | krb5-0:1.12.2-14.el7 | * |
| Krb5 | Ubuntu | lucid | * |
| Krb5 | Ubuntu | precise | * |
| Krb5 | Ubuntu | saucy | * |
| Krb5 | Ubuntu | trusty | * |
| Krb5 | Ubuntu | upstream | * |