Description
The merge_authdata function in kdc_authdata.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8.x before 1.8.4 does not properly manage an index into an authorization-data list, which allows remote attackers to cause a denial of service (daemon crash), or possibly obtain sensitive information, spoof authorization, or execute arbitrary code, via a TGS request that triggers an uninitialized pointer dereference, as demonstrated by a request from a Windows Active Directory client.
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 | 1.8.3+dfsg-2 | — |
| Debian 13 | krb5 | 1.8.3+dfsg-2 | — |
| Debian 12 | krb5 | 1.8.3+dfsg-2 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | krb5 +6 | 1.8.2-3.el6_0.1 | RHSA-2010:0863 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | krb5 | 1.15-1.1 | openSUSE-SU-2024:10004-1 |
Advisories 2
- RHSA-2010:0863 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
- MDVSA-2010:202 vendor-advisory
- 43756 vdb-entry
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-006.txt
- 20101005 MITKRB5-SA-2010-006 [CVE-2010-1322] KDC uninitialized pointer crash in authorization data handling mailing-list
- ADV-2010-2865 vdb-entry
- RHSA-2010:0863 vendor-advisory
- SUSE-SR:2010:019 vendor-advisory
- USN-999-1 vendor-advisory