net-snmp/SOURCES/net-snmp-5.7.2-CVE-2020-15862.patch
2021-09-09 22:45:16 +00:00

71 lines
2.5 KiB
Diff

diff -urNp old/agent/mibgroup/agent/extend.c new/agent/mibgroup/agent/extend.c
--- old/agent/mibgroup/agent/extend.c 2020-11-11 12:41:46.377115142 +0100
+++ new/agent/mibgroup/agent/extend.c 2020-11-11 12:50:28.047142105 +0100
@@ -16,6 +16,12 @@
#define SHELLCOMMAND 3
#endif
+/* This mib is potentially dangerous to turn on by default, since it
+ * allows arbitrary commands to be set by anyone with SNMP WRITE
+ * access to the MIB table. If all of your users are "root" level
+ * users, then it may be safe to turn on. */
+#define ENABLE_EXTEND_WRITE_ACCESS 0
+
netsnmp_feature_require(extract_table_row_data)
netsnmp_feature_require(table_data_delete_table)
#ifndef NETSNMP_NO_WRITE_SUPPORT
@@ -723,7 +729,7 @@ handle_nsExtendConfigTable(netsnmp_mib_h
*
**********/
-#ifndef NETSNMP_NO_WRITE_SUPPORT
+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
case MODE_SET_RESERVE1:
/*
* Validate the new assignments
@@ -1049,7 +1055,7 @@ handle_nsExtendConfigTable(netsnmp_mib_h
}
}
break;
-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
+#endif /* !NETSNMP_NO_WRITE_SUPPORT and ENABLE_EXTEND_WRITE_ACCESS */
default:
netsnmp_set_request_error(reqinfo, request, SNMP_ERR_GENERR);
@@ -1057,7 +1063,7 @@ handle_nsExtendConfigTable(netsnmp_mib_h
}
}
-#ifndef NETSNMP_NO_WRITE_SUPPORT
+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
/*
* If we're marking a given row as active,
* then we need to check that it's ready.
@@ -1082,7 +1088,7 @@ handle_nsExtendConfigTable(netsnmp_mib_h
}
}
}
-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
+#endif /* !NETSNMP_NO_WRITE_SUPPORT && ENABLE_EXTEND_WRITE_ACCESS */
return SNMP_ERR_NOERROR;
}
@@ -1571,7 +1577,7 @@ fixExec2Error(int action,
idx = name[name_len-1] -1;
exten = &compatability_entries[ idx ];
-#ifndef NETSNMP_NO_WRITE_SUPPORT
+#if !defined(NETSNMP_NO_WRITE_SUPPORT) && ENABLE_EXTEND_WRITE_ACCESS
switch (action) {
case MODE_SET_RESERVE1:
if (var_val_type != ASN_INTEGER) {
@@ -1592,7 +1598,7 @@ fixExec2Error(int action,
case MODE_SET_COMMIT:
netsnmp_cache_check_and_reload( exten->efix_entry->cache );
}
-#endif /* !NETSNMP_NO_WRITE_SUPPORT */
+#endif /* !NETSNMP_NO_WRITE_SUPPORT && ENABLE_EXTEND_WRITE_ACCESS */
return SNMP_ERR_NOERROR;
}
#endif /* USING_UCD_SNMP_EXTENSIBLE_MODULE */