Description
The build_principal_va function in lib/krb5/krb/bld_princ.c in MIT Kerberos 5 (aka krb5) before 1.14 allows remote authenticated users to cause a denial of service (out-of-bounds read and KDC crash) via an initial '\0' character in a long realm field within a TGS 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 | 1.13.2+dfsg-3 | — |
| Debian 13 | krb5 | 1.13.2+dfsg-3 | — |
| Debian 12 | krb5 | 1.13.2+dfsg-3 | — |
| Debian 8 | krb5 | 1.12.1+dfsg-19+deb8u1 | DSA-3395-1 |
| Debian 7 | krb5 | 1.10.1+dfsg-5+deb7u4 | DSA-3395-2, DSA-3395-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | krb5 | 1.8.3+dfsg-4squeeze10 | DLA-340-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | krb5 | 1.12+dfsg-2ubuntu5.2 | USN-2810-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | krb5 | 1.12.1-19.1 | SUSE-SU-2015:1897-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | krb5 | 1.12.1-19.1 | SUSE-SU-2015:1897-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 6
- USN-2810-1 krb5 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3395-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-340-1 krb5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3395-2 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
- SUSE-SU-2015:1897-1 Security update for krb5 SUSE / openSUSE Security Updates · May 2, 2025
References
- https://github.com/krb5/krb5/commit/f0c094a1b745d91ef2f9a4eae2149aac026a5789
- 77581 vdb-entry
- SUSE-SU-2015:1897 vendor-advisory
- GLSA-201611-14 vendor-advisory
- 1034084 vdb-entry
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- openSUSE-SU-2015:1997 vendor-advisory
- openSUSE-SU-2015:1928 vendor-advisory
- http://krbdev.mit.edu/rt/Ticket/Display.html?id=8252
- DSA-3395 vendor-advisory
- USN-2810-1 vendor-advisory