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import krb5-1.18.2-14.el8

This commit is contained in:
CentOS Sources 2021-08-26 04:20:22 +00:00 committed by Andrew Lukoshko
parent 64ad99e3d3
commit 79ef8ae9e1
2 changed files with 53 additions and 1 deletions
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47
SOURCES/Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch Normal file
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@ -0,0 +1,47 @@
From 0a8dfc380fe3b210662ba1b1d452fcec2f84841b Mon Sep 17 00:00:00 2001
From: Greg Hudson <ghudson@mit.edu>
Date: Tue, 3 Aug 2021 01:15:27 -0400
Subject: [PATCH] Fix KDC null deref on TGS inner body null server
After the KDC decodes a FAST inner body, it does not check for a null
server. Prior to commit 39548a5b17bbda9eeb63625a201cfd19b9de1c5b this
would typically result in an error from krb5_unparse_name(), but with
the addition of get_local_tgt() it results in a null dereference. Add
a null check.
Reported by Joseph Sutton of Catalyst.
CVE-2021-37750:
In MIT krb5 releases 1.14 and later, an authenticated attacker can
cause a null dereference in the KDC by sending a FAST TGS request with
no server field.
ticket: 9008 (new)
tags: pullup
target_version: 1.19-next
target_version: 1.18-next
(cherry picked from commit d775c95af7606a51bf79547a94fa52ddd1cb7f49)
(cherry picked from commit bb8fa495d00ccd931eec87a01b8920636cf7903e)
(cherry picked from commit dfe383f8251d0edc7e5e08ec5e4fdd9b7f902b2a)
---
src/kdc/do_tgs_req.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/kdc/do_tgs_req.c b/src/kdc/do_tgs_req.c
index 463a9c0dd..7c596a111 100644
--- a/src/kdc/do_tgs_req.c
+++ b/src/kdc/do_tgs_req.c
@@ -208,6 +208,11 @@ process_tgs_req(krb5_kdc_req *request, krb5_data *pkt,
status = "FIND_FAST";
goto cleanup;
}
+ if (sprinc == NULL) {
+ status = "NULL_SERVER";
+ errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
+ goto cleanup;
+ }
errcode = get_local_tgt(kdc_context, &sprinc->realm, header_server,
&local_tgt, &local_tgt_storage, &local_tgt_key);

7
SPECS/krb5.spec
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@ -18,7 +18,7 @@ Summary: The Kerberos network authentication system
Name: krb5
Version: 1.18.2
# for prerelease, should be e.g., 0.% {prerelease}.1% { ?dist } (without spaces)
Release: 13%{?dist}
Release: 14%{?dist}
# lookaside-cached sources; two downloads and a build artifact
Source0: https://web.mit.edu/kerberos/dist/krb5/1.18/krb5-%{version}%{prerelease}.tar.gz
@ -85,6 +85,7 @@ Patch139: Make-KCM-iteration-fallback-work-with-sssd-kcm.patch
Patch140: Use-KCM_OP_RETRIEVE-in-KCM-client.patch
Patch141: Fix-KCM-retrieval-support-for-sssd.patch
Patch142: Fix-KDC-null-deref-on-bad-encrypted-challenge.patch
Patch143: Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
License: MIT
URL: http://web.mit.edu/kerberos/www/
@ -695,6 +696,10 @@ exit 0
%{_libdir}/libkadm5srv_mit.so.*
%changelog
* Wed Aug 25 2021 Robbie Harwood <rharwood@redhat.com> - 1.18.2-14
- Fix KDC null deref on TGS inner body null server (CVE-2021-37750)
- Resolves: #1997601
* Tue Jul 20 2021 Robbie Harwood <rharwood@redhat.com> - 1.18.2-13
- Fix KDC null deref on bad encrypted challenge (CVE-2021-36222)
- Resolves: #1983729