Headline
CVE-2019-14844: reversed strlcpy() allows client to crash the KDC
A flaw was found in, Fedora versions of krb5 from 1.16.1 to, including 1.17.x, in the way a Kerberos client could crash the KDC by sending one of the RFC 4556 "enctypes". A remote unauthenticated user could use this flaw to crash the KDC.
Description msiddiqu 2019-09-19 11:19:57 UTC
A client can crash the KDC in enctype_name() by sendingone of the RFC 4556 enctypes, because of reversed strlcpy() arguments atthe end of enctype_name()
References:
https://bugzilla.redhat.com/show_bug.cgi?id=1664157
Comment 1 Huzaifa S. Sidhpurwala 2019-09-23 05:27:02 UTC
This issue is caused by backporting commits due to the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=1664157
Comment 5 Huzaifa S. Sidhpurwala 2019-09-26 03:55:09 UTC
External References:
https://github.com/krb5/krb5/pull/981
Comment 6 Huzaifa S. Sidhpurwala 2019-09-26 03:59:07 UTC
Note:
This flaw was introduced in upstream commit: https://github.com/krb5/krb5/commit/a649279727490687d54becad91fde8cf7429d951 and fixed via https://github.com/krb5/krb5/pull/981/commits/275c9a1aad36a1a7b56042f1a2c21c33e7d16eaf
This flaw does not affect any MIT krb5 upstream releases. Fedora versions of MIT krb5 are affected and fixed via the following updates:
https://bodhi.fedoraproject.org/updates/FEDORA-2019-f939e79e24 https://bodhi.fedoraproject.org/updates/FEDORA-2019-2323661e5f https://bodhi.fedoraproject.org/updates/FEDORA-2019-320a5a6a68 https://bodhi.fedoraproject.org/updates/FEDORA-2019-dc4e1d0fb6
Comment 7 Huzaifa S. Sidhpurwala 2019-09-26 03:59:13 UTC
Statement:
This flaw affects the krb5 server only; client-side packages are not affected. This flaw does not affect any krb5 packages shipped with Red Hat products.
Comment 8 Product Security DevOps Team 2019-11-20 06:51:12 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):
https://access.redhat.com/security/cve/cve-2019-14844