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Accepting request 915042 from home:scabrero:branches:network

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- Fix KDC null pointer dereference via a FAST inner body that
  lacks a server field; (CVE-2021-37750); (bsc#1189929);
- Added patches:
  * 0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch

OBS-URL: https://build.opensuse.org/request/show/915042
OBS-URL: https://build.opensuse.org/package/show/network/krb5?expand=0&rev=253
This commit is contained in:
Samuel Cabrero 2021-09-09 09:25:27 +00:00 committed by Git OBS Bridge
parent d342aedfcc
commit cba0a3d8f7
5 changed files with 66 additions and 0 deletions
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48
0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch Normal file
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@ -0,0 +1,48 @@
From 74444508aa249bf8d34865e25413c6432e7583b4 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)
---
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 6d244ffd4..39a504ca1 100644
--- a/src/kdc/do_tgs_req.c
+++ b/src/kdc/do_tgs_req.c
@@ -207,6 +207,11 @@ 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);
--
2.33.0

8
krb5-mini.changes
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@ -1,3 +1,11 @@
-------------------------------------------------------------------
Mon Aug 30 12:45:25 UTC 2021 - Samuel Cabrero <scabrero@suse.de>
- Fix KDC null pointer dereference via a FAST inner body that
lacks a server field; (CVE-2021-37750); (bsc#1189929);
- Added patches:
* 0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
-------------------------------------------------------------------
Mon Aug 2 08:39:31 UTC 2021 - Samuel Cabrero <scabrero@suse.de>

1
krb5-mini.spec
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@ -44,6 +44,7 @@ Patch5: 0005-krb5-1.6.3-ktutil-manpage.patch
Patch6: 0006-krb5-1.12-api.patch
Patch7: 0007-SELinux-integration.patch
Patch8: 0008-krb5-1.9-debuginfo.patch
Patch9: 0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
BuildRequires: autoconf
BuildRequires: bison
BuildRequires: keyutils

8
krb5.changes
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@ -1,3 +1,11 @@
-------------------------------------------------------------------
Mon Aug 30 12:45:25 UTC 2021 - Samuel Cabrero <scabrero@suse.de>
- Fix KDC null pointer dereference via a FAST inner body that
lacks a server field; (CVE-2021-37750); (bsc#1189929);
- Added patches:
* 0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
-------------------------------------------------------------------
Mon Aug 2 08:39:31 UTC 2021 - Samuel Cabrero <scabrero@suse.de>

1
krb5.spec
View File

@ -42,6 +42,7 @@ Patch5: 0005-krb5-1.6.3-ktutil-manpage.patch
Patch6: 0006-krb5-1.12-api.patch
Patch7: 0007-SELinux-integration.patch
Patch8: 0008-krb5-1.9-debuginfo.patch
Patch9: 0009-Fix-KDC-null-deref-on-TGS-inner-body-null-server.patch
BuildRequires: autoconf
BuildRequires: bison
BuildRequires: cyrus-sasl-devel