Description
The check_1_6_dummy function in lib/kadm5/srv/svr_principal.c in kadmind in MIT Kerberos 5 (aka krb5) 1.8.x, 1.9.x, and 1.10.x before 1.10.2 allows remote authenticated administrators to cause a denial of service (NULL pointer dereference and daemon crash) via a KRB5_KDB_DISALLOW_ALL_TIX create request that lacks a password.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | krb5 | 1.10.1+dfsg-3 | — |
| Debian 13 | krb5 | 1.10.1+dfsg-3 | — |
| Debian 12 | krb5 | 1.10.1+dfsg-3 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.9-33.el6_3.2 | RHSA-2012:1131 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 2
- RHSA-2012:1131 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- http://krbdev.mit.edu/rt/Ticket/Display.html?user=guest&pass=guest&id=7152
- 53784 vdb-entry
- MDVSA-2012:102 vendor-advisory
- RHSA-2012:1131 vendor-advisory
- http://web.mit.edu/kerberos/krb5-1.10/
- https://bugzilla.redhat.com/show_bug.cgi?id=827517
- openSUSE-SU-2012:0834 vendor-advisory
- https://github.com/krb5/krb5/commit/c5be6209311d4a8f10fda37d0d3f876c1b33b77b
- [kerberos-announce] 20120531 krb5-1.10.2 is released mailing-list