Bug 1753589 (CVE-2019-14844) - CVE-2019-14844 krb5: reversed strlcpy() allows client to crash the KDC
Summary: CVE-2019-14844 krb5: reversed strlcpy() allows client to crash the KDC
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-14844
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1754369
Blocks: 1753106
TreeView+ depends on / blocked
 
Reported: 2019-09-19 11:19 UTC by msiddiqu
Modified: 2021-02-16 21:21 UTC (History)
28 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found 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.
Clone Of:
Environment:
Last Closed: 2019-11-20 06:51:12 UTC
Embargoed:

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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
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