Description
schpw.c in the kpasswd service in kadmind in MIT Kerberos 5 (aka krb5) before 1.11.3 does not properly validate UDP packets before sending responses, which allows remote attackers to cause a denial of service (CPU and bandwidth consumption) via a forged packet that triggers a communication loop, as demonstrated by krb_pingpong.nasl, a related issue to CVE-1999-0103.
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-6 | — |
| Debian 13 | krb5 | 1.10.1+dfsg-6 | — |
| Debian 12 | krb5 | 1.10.1+dfsg-6 | — |
| Debian 7 | krb5 | 1.10.1+dfsg-5+deb7u1 | DSA-2701-1 |
| Debian 6.0 | krb5 | 1.8.3+dfsg-4squeeze7 | DSA-2701-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu5.2 | USN-2810-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.10.3-10.el6_4.3 | RHSA-2013:0942 |
| RHEL 5 | krb5 +5 | 1.6.1-70.el5_9.2 | RHSA-2013:0942 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 4
- RHSA-2013:0942 Red Hat Security Advisory: krb5 security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-2810-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-2701-1 krb5 - denial of service 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
- FEDORA-2013-8113 vendor-advisory
- openSUSE-SU-2013:1119 vendor-advisory
- openSUSE-SU-2013:1122 vendor-advisory
- DSA-2701 vendor-advisory
- https://github.com/krb5/krb5/commit/cf1a0c411b2668c57c41e9c4efd15ba17b6b322c
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=7637
- FEDORA-2013-8219 vendor-advisory
- FEDORA-2013-8212 vendor-advisory
- RHSA-2013:0942 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=962531
- USN-2810-1 vendor-advisory
- MDVSA-2013:166 vendor-advisory