The pkinit_check_kdc_pkid function in plugins/preauth/pkinit/pkinit_crypto_openssl.c in the PKINIT implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.4 and 1.11.x before 1.11.1 does not properly handle errors during extraction of fields from an X.509 certificate, which allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a malformed KRB5_PADATA_PK_AS_REQ AS-REQ 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) |
| Kerberos_5 | Mit | 1.11 (including) | 1.11 (including) |
| Red Hat Enterprise Linux 6 | RedHat | krb5-0:1.10.3-10.el6_4.1 | * |
| Krb5 | Ubuntu | hardy | * |
| Krb5 | Ubuntu | lucid | * |
| Krb5 | Ubuntu | oneiric | * |
| Krb5 | Ubuntu | precise | * |
| Krb5 | Ubuntu | quantal | * |
| Krb5 | Ubuntu | upstream | * |
Potential Mitigations
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7570
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7577
- http://lists.opensuse.org/opensuse-updates/2013-03/msg00090.html
- http://secunia.com/advisories/55040
- http://web.mit.edu/kerberos/www/krb5-1.10/
- http://web.mit.edu/kerberos/www/krb5-1.11/
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:157
- https://github.com/krb5/krb5/commit/f249555301940c6df3a2cdda13b56b5674eebc2e
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7570
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7577
- http://lists.opensuse.org/opensuse-updates/2013-03/msg00090.html
- http://secunia.com/advisories/55040
- http://web.mit.edu/kerberos/www/krb5-1.10/
- http://web.mit.edu/kerberos/www/krb5-1.11/
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:157
- https://github.com/krb5/krb5/commit/f249555301940c6df3a2cdda13b56b5674eebc2e