Oracle 11.2.0.4 TNS 监听器远程中毒漏洞(CVE-2012-1675)修复方案

2021-11-07 00:13:31

Oracle 11.2.0.4 单实例和RAC修复方案

随着对网络安全的进一步重视，Oracle TNS 监听器远程中毒漏洞(CVE-2012-1675)被列为了高危漏洞，需要进行漏洞修复。

从Oracle 11.2.0.4开始，Oracle 引入了Valid Node Checking For Registration(VNCR)新特性,可以通过配置参数VALID_NODE_CHECKING_REGISTRATION_LISTENER来修复该漏洞。

1. 修复Oracle TNS 监听器远程中毒漏洞

1.1 修改监听文件

    vi $ORACLE_HOME/network/admin/listener.ora
    # listener.ora Network Configuration File: /u01/app/oracle/product/11.2.0/db_1/network/admin/listener.ora
    # Generated by Oracle configuration tools.
    
    SID_LIST_LISTENER =
      (SID_LIST =
        (SID_DESC =
          (GLOBAL_DBNAME = ods)
          (ORACLE_HOME = /u01/app/oracle/product/11.2.0/db_1)
          (SID_NAME = ods)
        )
      )
    
    LISTENER =
      (DESCRIPTION_LIST =
        (DESCRIPTION =
          (ADDRESS = (PROTOCOL = TCP)(HOST = IP或主机名)(PORT = 1521))
         # (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))  --注释掉，一般不会使用ipc，绝大部分应用使用tcp连接数据库
        )
      )
    
    ADR_BASE_LISTENER = /u01/app/oracle
    # 单实例只需要新增下面这一行就OK
    VALID_NODE_CHECKING_REGISTRATION_LISTENER=1 
    
    # RAC需要新增下面三行，有多少个LISTENER_SCAN监听就添加几个
    VALID_NODE_CHECKING_REGISTRATION_LISTENER=ON
    VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=ON
    REGISTRATION_INVITED_NODES_LISTENER_SCAN1=(添加rac节点的所有public IP，包括主机IP，VIP，SCANIP)

1.2 重新加载监听

lsnrctl reload
lsnrctl reload listener_scan1     # RAC实例还需要执行该命令

2. 验证漏洞修复情况

2.1. 注释VNCR规则验证监听情况

2.1.1. 注释掉listener.ora文件中的VNCR规则

    # 单实例
    # VALID_NODE_CHECKING_REGISTRATION_LISTENER=1 
    
    # RAC
   # VALID_NODE_CHECKING_REGISTRATION_LISTENER=ON
   # VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=ON
   # REGISTRATION_INVITED_NODES_LISTENER_SCAN1=(所有的节点的所有public IP)

2.1.2. 并重新reload监听

lsnrctl reload
lsnrctl reload listener_scan1     # RAC实例还需要执行该命令

2.1.3. 在其他数据库上设置remote_listener

SQL> show parameter remote_listener
SQL> alter system set remote_listener=‘(ADDRESS = (PROTOCOL = TCP)(HOST =ip)(PORT = 1521))‘ scope=memory;
SQL> show parameter remote_listener
SQL> alter system register;

2.1.4. 查看监听服务信息

查看监听服务信息中是否有“REMOTE SERVER”字样，该字样就是有该漏洞信息的标志:

$ lsnrctl services listener
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 04-SEP-2019 17:16:55
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521)))
Services Summary...
Service "TESTDB" has 1 instance(s).
  Instance "TESTDB", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0 state:blocked
         REMOTE SERVER
         (ADDRESS=(PROTOCOL=TCP)(HOST=localhost.localdomain)(PORT=1521))
Service "ods" has 2 instance(s).
  Instance "ods", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
  Instance "ods", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:2 refused:0 state:ready
         LOCAL SERVER
Service "odsXDB" has 1 instance(s).
  Instance "ods", status READY, has 1 handler(s) for this service...
    Handler(s):
      "D000" established:0 refused:0 current:0 max:1022 state:ready
         DISPATCHER <machine: localhost, pid: 18481>
         (ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=29037))
The command completed successfully

2.1.5. 查看监听日志

04-SEP-2019 17:16:55 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=ip)(USER=oracle))(COMMAND=services)(ARGUMENTS=64)(SERVICE=listener)(VERSION=186647552)) * services * 0
Wed Sep 04 17:17:21 2019
04-SEP-2019 17:17:21 * service_update * testdb * 0
Wed Sep 04 17:17:51 2019
04-SEP-2019 17:17:51 * service_update * testdb * 0
04-SEP-2019 17:17:54 * service_update * testdb * 0
04-SEP-2019 17:17:57 * service_update * testdb * 0
Wed Sep 04 17:18:21 2019
04-SEP-2019 17:18:21 * service_update * testdb * 0

以上信息说明有远程注册的的testdb。

2.2. 生效VNCR规则验证监听情况

2.2.1. 生效VNCR规则

# 单实例
  VALID_NODE_CHECKING_REGISTRATION_LISTENER=1 

# RAC
  VALID_NODE_CHECKING_REGISTRATION_LISTENER=ON
  VALID_NODE_CHECKING_REGISTRATION_LISTENER_SCAN1=ON
  REGISTRATION_INVITED_NODES_LISTENER_SCAN1=(所有的节点的所有public IP)

2.2.2. 重新加载监听

  lsnrctl reload
  lsnrctl reload listener_scan1     # RAC实例还需要执行该命令

2.2.3. 在另一台数据库操作

执行快速动态监听注册命令，因之前已经设置了remote server这里不需要在重新设置了，只需要执行alter system register命令即可。

SQL> alter system register;

2.2.4. 查看监听服务信息

通过查看下面的监听服务信息,已经没有“REMOTE SERVER”字样，说明此时漏洞已修复:

$ lsnrctl services listener
LSNRCTL for Linux: Version 11.2.0.4.0 - Production on 04-SEP-2019 17:26:12
Copyright (c) 1991, 2013, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost(PORT=1521)))
Services Summary...
Service "ods" has 2 instance(s).
  Instance "ods", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
  Instance "ods", status READY, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:3 refused:0 state:ready
         LOCAL SERVER
Service "odsXDB" has 1 instance(s).
  Instance "ods", status READY, has 1 handler(s) for this service...
    Handler(s):
      "D000" established:0 refused:0 current:0 max:1022 state:ready
         DISPATCHER <machine: xxptods, pid: 18481>
         (ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=29037))
The command completed successfully

2.2.5. 查看监听日志

在下面的监听日志中可以看到拒绝了远程监听注册服务

Wed Sep 04 17:25:15 2019
Listener(VNCR option 1) rejected Registration request from destination 10.0.100.7
04-SEP-2019 17:25:15 * service_register_NSGR * 1182
TNS-01182: Listener rejected registration of service ""

3. 补充说明

3.1. VALID_NODE_CHECKING_REGISTRATION_listener_name

listener_name：为监听的名字

参数取值：

OFF/0 表示禁用VNCR，此功能不会对注册过来的service进行check
ON/1/LOCAL 表示启用VNCR,默认只允许本机的所有IP的服务注册到本监听,可通过REGISTRATION_INVITED_NODES参数添加其他有必要的服务器
SUBNET/2 表示指定子网内的服务器可以注册过来

3.2. REGISTRATION_INVITED_NODES_listener-name

该参数控制允许链接过来的节点，可以通过IP地址/主机名/网段来指定

For example:REGISTRATION_INVITED_NODES_Listener=(net-vm1, 127.98.45.209, 127.42.5.*)

Note: that when an INVITED list is set, it will automatically include the machine’s local IP in the list. There is no need to include it.

3.3. 11.2.0.4和12c区别之处

在12.1 RAC数据库上，listener的参数VALID_NODE_CHECKING_REGISTRATION_listener_name 默认设置为 SUBNET / 2，即子网中的所有计算机都允许注册.所以12c默认不能解决CVE-2012-1675漏洞

4. 参考文档

Valid Node Checking For Registration (VNCR) (Doc ID 1600630.1)
How to Enable VNCR on RAC Database to Register only Local Instances (Doc ID 1914282.1)