The unparse implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.6.x through 1.9, when an LDAP backend is used, allows remote attackers to cause a denial of service (file descriptor exhaustion and daemon hang) via a principal name that triggers use of a backslash escape sequence, as demonstrated by a n sequence.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Kerberos | Mit | 5-1.6.3 | 5-1.6.3 |
| Kerberos_5 | Mit | 1.6 | 1.6 |
| Kerberos_5 | Mit | 1.6.1 | 1.6.1 |
| Kerberos_5 | Mit | 1.6.2 | 1.6.2 |
| Kerberos_5 | Mit | 1.7 | 1.7 |
| Kerberos_5 | Mit | 1.7.1 | 1.7.1 |
| Kerberos_5 | Mit | 1.8 | 1.8 |
| Kerberos_5 | Mit | 1.8.1 | 1.8.1 |
| Kerberos_5 | Mit | 1.8.2 | 1.8.2 |
| Kerberos_5 | Mit | 1.8.3 | 1.8.3 |
| Kerberos_5 | Mit | 1.9 | 1.9 |
| Red Hat Enterprise Linux 5 | RedHat | krb5-0:1.6.1-55.el5_6.1 | * |
| Red Hat Enterprise Linux 6 | RedHat | krb5-0:1.8.2-3.el6_0.4 | * |
| Krb5 | Ubuntu | hardy | * |
| Krb5 | Ubuntu | karmic | * |
| Krb5 | Ubuntu | lucid | * |
| Krb5 | Ubuntu | maverick | * |