Description
The prep_reprocess_req function in kdc/do_tgs_req.c in the cross-realm referral implementation in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 before 1.7.1 allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a ticket 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 | 1.7+dfsg-4 | — |
| Debian 13 | krb5 | 1.7+dfsg-4 | — |
| Debian 12 | krb5 | 1.7+dfsg-4 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 1
- openSUSE-SU-2024:10004-1 krb5-1.15-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- 37977 third-party-advisory
- ADV-2009-3652 vdb-entry
- 1023392 vdb-entry
- 37486 vdb-entry
- 20091228 MITKRB5-SA-2009-003 [CVE-2009-3295] KDC denial of service in cross-realm referral processing mailing-list
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2009-003.txt