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fix CVE-2022-44792 CVE-2022-44793

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This commit is contained in:
eaglegai 2022-12-30 02:27:34 +00:00
parent 12b166e40f
commit eba1635f57
2 changed files with 136 additions and 1 deletions
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128
backport-CVE-2022-44792_CVE-2022-44793.patch Normal file
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@ -0,0 +1,128 @@
From 4589352dac3ae111c7621298cf231742209efd9b Mon Sep 17 00:00:00 2001
From: Bill Fenner <fenner@gmail.com>
Date: Fri, 25 Nov 2022 08:41:24 -0800
Subject: [PATCH 1/3] snmp_agent: disallow SET with NULL varbind
---
agent/snmp_agent.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/agent/snmp_agent.c b/agent/snmp_agent.c
index 867d0c166f..3f678fe2df 100644
--- a/agent/snmp_agent.c
+++ b/agent/snmp_agent.c
@@ -3719,12 +3719,44 @@ netsnmp_handle_request(netsnmp_agent_session *asp, int status)
return 1;
}
+static int
+check_set_pdu_for_null_varbind(netsnmp_agent_session *asp)
+{
+ int i;
+ netsnmp_variable_list *v = NULL;
+
+ for (i = 1, v = asp->pdu->variables; v != NULL; i++, v = v->next_variable) {
+ if (v->type == ASN_NULL) {
+ /*
+ * Protect SET implementations that do not protect themselves
+ * against wrong type.
+ */
+ DEBUGMSGTL(("snmp_agent", "disallowing SET with NULL var for varbind %d\n", i));
+ asp->index = i;
+ return SNMP_ERR_WRONGTYPE;
+ }
+ }
+ return SNMP_ERR_NOERROR;
+}
+
int
handle_pdu(netsnmp_agent_session *asp)
{
int status, inclusives = 0;
netsnmp_variable_list *v = NULL;
+#ifndef NETSNMP_NO_WRITE_SUPPORT
+ /*
+ * Check for ASN_NULL in SET request
+ */
+ if (asp->pdu->command == SNMP_MSG_SET) {
+ status = check_set_pdu_for_null_varbind(asp);
+ if (status != SNMP_ERR_NOERROR) {
+ return status;
+ }
+ }
+#endif /* NETSNMP_NO_WRITE_SUPPORT */
+
/*
* for illegal requests, mark all nodes as ASN_NULL
*/
From 7f4ac4051cc7fec6a5944661923acb95cec359c7 Mon Sep 17 00:00:00 2001
From: Bill Fenner <fenner@gmail.com>
Date: Fri, 25 Nov 2022 08:41:46 -0800
Subject: [PATCH 2/3] apps: snmpset: allow SET with NULL varbind for testing
---
apps/snmpset.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/apps/snmpset.c b/apps/snmpset.c
index 48e14bd513..d542713e1b 100644
--- a/apps/snmpset.c
+++ b/apps/snmpset.c
@@ -182,6 +182,7 @@ main(int argc, char *argv[])
case 'x':
case 'd':
case 'b':
+ case 'n': /* undocumented */
#ifdef NETSNMP_WITH_OPAQUE_SPECIAL_TYPES
case 'I':
case 'U':
From 15f9d7f7e5b90c9b419832ed8e6413feb6570d83 Mon Sep 17 00:00:00 2001
From: Bill Fenner <fenner@gmail.com>
Date: Fri, 25 Nov 2022 10:23:32 -0800
Subject: [PATCH 3/3] Add test for NULL varbind set
---
.../default/T0142snmpv2csetnull_simple | 31 +++++++++++++++++++
1 file changed, 31 insertions(+)
create mode 100644 testing/fulltests/default/T0142snmpv2csetnull_simple
diff --git a/testing/fulltests/default/T0142snmpv2csetnull_simple b/testing/fulltests/default/T0142snmpv2csetnull_simple
new file mode 100644
index 0000000000..0f1b8f386b
--- /dev/null
+++ b/testing/fulltests/default/T0142snmpv2csetnull_simple
@@ -0,0 +1,31 @@
+#!/bin/sh
+
+. ../support/simple_eval_tools.sh
+
+HEADER SNMPv2c set of system.sysContact.0 with NULL varbind
+
+SKIPIF NETSNMP_DISABLE_SET_SUPPORT
+SKIPIF NETSNMP_NO_WRITE_SUPPORT
+SKIPIF NETSNMP_DISABLE_SNMPV2C
+SKIPIFNOT USING_MIBII_SYSTEM_MIB_MODULE
+
+#
+# Begin test
+#
+
+# standard V2C configuration: testcomunnity
+snmp_write_access='all'
+. ./Sv2cconfig
+STARTAGENT
+
+CAPTURE "snmpget -On $SNMP_FLAGS -c testcommunity -v 2c $SNMP_TRANSPORT_SPEC:$SNMP_TEST_DEST$SNMP_SNMPD_PORT .1.3.6.1.2.1.1.4.0"
+
+CHECK ".1.3.6.1.2.1.1.4.0 = STRING:"
+
+CAPTURE "snmpset -On $SNMP_FLAGS -c testcommunity -v 2c $SNMP_TRANSPORT_SPEC:$SNMP_TEST_DEST$SNMP_SNMPD_PORT .1.3.6.1.2.1.1.4.0 n x"
+
+CHECK "Reason: wrongType"
+
+STOPAGENT
+
+FINISHED

9
net-snmp.spec
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@ -3,7 +3,7 @@
Name: net-snmp
Version: 5.9.1
Release: 5
Release: 6
Epoch: 1
Summary: SNMP Daemon
License: BSD
@ -54,6 +54,7 @@ Patch37: backport-Linux-IF-MIB-Fix-a-memory-leak.patch
Patch38: backport-IF-MIB-IP-FORWARD-MIB-Improve-robustness.patch
Patch39: backport-IF-MIB-Fix-a-recently-introduced-use-after-free.patch
Patch40: backport-IF-MIB-Add-a-trailing-newline-to-an-error-message.patch
Patch41: backport-CVE-2022-44792_CVE-2022-44793.patch
%{?systemd_requires}
BuildRequires: systemd gcc openssl-devel bzip2-devel elfutils-devel libselinux-devel
@ -333,6 +334,12 @@ LD_LIBRARY_PATH=%{buildroot}/%{_libdir} make test
%{_mandir}/man1/fixproc*
%changelog
* Fri Dec 30 2022 gaihuiying <eaglegai@163.com> - 1:5.9.1-6
- Type:CVE
- CVE:CVE-2022-44792 CVE-2022-44793
- SUG:NA
- DESC:fix CVE-2022-44792 CVE-2022-44793
* Fri Sep 30 2022 xingwei <xingwei14@h-partners.com> - 1:5.9.1-5
- Type:bugfix
- CVE:NA