The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
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 | * | 1.18.5 (excluding) |
| Kerberos_5 | Mit | 1.19.0 (including) | 1.19.3 (excluding) |
| Red Hat Enterprise Linux 7 | RedHat | krb5-0:1.15.1-51.el7_9 | * |
| Red Hat Enterprise Linux 8 | RedHat | krb5-0:1.18.2-8.3.el8_4 | * |
| Krb5 | Ubuntu | bionic | * |
| Krb5 | Ubuntu | esm-infra/bionic | * |
| Krb5 | Ubuntu | esm-infra/focal | * |
| Krb5 | Ubuntu | focal | * |
| Krb5 | Ubuntu | hirsute | * |
| Krb5 | Ubuntu | impish | * |
| Krb5 | Ubuntu | trusty | * |
| Krb5 | Ubuntu | upstream | * |
| Krb5 | Ubuntu | xenial | * |
Potential Mitigations
References
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
- https://github.com/krb5/krb5/releases
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/
- https://security.netapp.com/advisory/ntap-20210923-0002/
- https://web.mit.edu/kerberos/advisories/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.starwindsoftware.com/security/sw-20220817-0004/
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
- https://github.com/krb5/krb5/releases
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/
- https://security.netapp.com/advisory/ntap-20210923-0002/
- https://web.mit.edu/kerberos/advisories/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://www.starwindsoftware.com/security/sw-20220817-0004/