import krb5-1.18.2-14.el8
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From 0a8dfc380fe3b210662ba1b1d452fcec2f84841b Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Tue, 3 Aug 2021 01:15:27 -0400
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Subject: [PATCH] Fix KDC null deref on TGS inner body null server
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After the KDC decodes a FAST inner body, it does not check for a null
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server. Prior to commit 39548a5b17bbda9eeb63625a201cfd19b9de1c5b this
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would typically result in an error from krb5_unparse_name(), but with
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the addition of get_local_tgt() it results in a null dereference. Add
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a null check.
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Reported by Joseph Sutton of Catalyst.
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CVE-2021-37750:
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In MIT krb5 releases 1.14 and later, an authenticated attacker can
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cause a null dereference in the KDC by sending a FAST TGS request with
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no server field.
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ticket: 9008 (new)
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tags: pullup
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target_version: 1.19-next
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target_version: 1.18-next
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(cherry picked from commit d775c95af7606a51bf79547a94fa52ddd1cb7f49)
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(cherry picked from commit bb8fa495d00ccd931eec87a01b8920636cf7903e)
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(cherry picked from commit dfe383f8251d0edc7e5e08ec5e4fdd9b7f902b2a)
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---
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src/kdc/do_tgs_req.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/src/kdc/do_tgs_req.c b/src/kdc/do_tgs_req.c
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index 463a9c0dd..7c596a111 100644
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--- a/src/kdc/do_tgs_req.c
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+++ b/src/kdc/do_tgs_req.c
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@@ -208,6 +208,11 @@ process_tgs_req(krb5_kdc_req *request, krb5_data *pkt,
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status = "FIND_FAST";
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goto cleanup;
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}
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+ if (sprinc == NULL) {
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+ status = "NULL_SERVER";
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+ errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
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+ goto cleanup;
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+ }
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errcode = get_local_tgt(kdc_context, &sprinc->realm, header_server,
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&local_tgt, &local_tgt_storage, &local_tgt_key);
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@ -18,7 +18,7 @@ Summary: The Kerberos network authentication system
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Name: krb5
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Name: krb5
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Version: 1.18.2
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Version: 1.18.2
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# for prerelease, should be e.g., 0.% {prerelease}.1% { ?dist } (without spaces)
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# for prerelease, should be e.g., 0.% {prerelease}.1% { ?dist } (without spaces)
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Release: 13%{?dist}
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Release: 14%{?dist}
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# lookaside-cached sources; two downloads and a build artifact
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# lookaside-cached sources; two downloads and a build artifact
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Source0: https://web.mit.edu/kerberos/dist/krb5/1.18/krb5-%{version}%{prerelease}.tar.gz
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Source0: https://web.mit.edu/kerberos/dist/krb5/1.18/krb5-%{version}%{prerelease}.tar.gz
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@ -85,6 +85,7 @@ Patch139: Make-KCM-iteration-fallback-work-with-sssd-kcm.patch
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Patch140: Use-KCM_OP_RETRIEVE-in-KCM-client.patch
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Patch140: Use-KCM_OP_RETRIEVE-in-KCM-client.patch
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Patch141: Fix-KCM-retrieval-support-for-sssd.patch
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Patch141: Fix-KCM-retrieval-support-for-sssd.patch
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Patch142: Fix-KDC-null-deref-on-bad-encrypted-challenge.patch
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Patch142: Fix-KDC-null-deref-on-bad-encrypted-challenge.patch
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Patch143: Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
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License: MIT
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License: MIT
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URL: http://web.mit.edu/kerberos/www/
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URL: http://web.mit.edu/kerberos/www/
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@ -695,6 +696,10 @@ exit 0
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%{_libdir}/libkadm5srv_mit.so.*
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%{_libdir}/libkadm5srv_mit.so.*
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%changelog
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%changelog
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* Wed Aug 25 2021 Robbie Harwood <rharwood@redhat.com> - 1.18.2-14
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- Fix KDC null deref on TGS inner body null server (CVE-2021-37750)
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- Resolves: #1997601
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* Tue Jul 20 2021 Robbie Harwood <rharwood@redhat.com> - 1.18.2-13
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* Tue Jul 20 2021 Robbie Harwood <rharwood@redhat.com> - 1.18.2-13
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- Fix KDC null deref on bad encrypted challenge (CVE-2021-36222)
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- Fix KDC null deref on bad encrypted challenge (CVE-2021-36222)
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- Resolves: #1983729
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- Resolves: #1983729
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