Description
The setup_server_realm function in main.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.7, when multiple realms are configured, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a crafted request.
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 | 1.11.3+dfsg-3+nmu1 | — |
| Debian 13 | krb5 | 1.11.3+dfsg-3+nmu1 | — |
| Debian 12 | krb5 | 1.11.3+dfsg-3+nmu1 | — |
| Debian 7 | krb5 | 1.10.1+dfsg-5+deb7u9 | DLA-1265-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu4.2 | USN-2310-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.10.3-33.el6 | RHSA-2014:1389 |
| RHEL 5 | krb5 +5 | 1.6.1-78.el5 | RHSA-2014:1245 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 5
- RHSA-2014:1389 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2014:1245 Red Hat Security Advisory: krb5 security and bug fix update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-2310-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-1265-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1026942
- openSUSE-SU-2013:1738 vendor-advisory
- [debian-lts-announce] 20180131 [SECURITY] [DLA 1265-1] krb5 security update mailing-list
- http://advisories.mageia.org/MGASA-2013-0335.html
- https://github.com/krb5/krb5/commit/c2ccf4197f697c4ff143b8a786acdd875e70a89d
- openSUSE-SU-2013:1751 vendor-advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7757
- http://web.mit.edu/kerberos/krb5-1.10/README-1.10.7.txt
- 63555 vdb-entry
- openSUSE-SU-2013:1833 vendor-advisory
- http://web.mit.edu/kerberos/krb5-1.11/README-1.11.4.txt