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SQL病毒CISCO完全解决方案

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访问列表防御 1.创建访问列表 access-list 101 deny udp any any eq 1434 access-list 101 permit ip any any 2.匹配访问列表和数据包长度 class-map match-all slammer_worm match access-group 101 match packet length min 404 max 404 3.丢弃所匹配的数据

访问列表防御

1.创建访问列表

access-list 101 deny udp any any eq 1434

access-list 101 permit ip any any

2.匹配访问列表和数据包长度

class-map match-all slammer_worm

match access-group 101

match packet length min 404 max 404

3.丢弃所匹配的数据包

policy-map drop-slammer-worm

class slammer_worm

police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop

NBAR

1. Create custom protocol

ip nbar port-map custom-01 udp 1434

2. Create class-map

class-map match-all slammer_worm

match protocol custom-01

match packet length min 404 max 404

3. Use class-based policing to drop the matching packets at the ingress interface

policy-map drop-slammer-worm

class slammer_worm

police 1000000 31250 31250 conform-action drop exceed-action drop violate-action drop

NetFlow

Router# config t

Router# (config) interface serial 0/1

Router#(config-if) ip route-cache flow

Router#(config-if) exit

Router#(config) exit

Router#

输出统计表

Router# (config) ip flow-export 192.168.155.1 700

To view NetFlow statistics for port 1434:

Router# show ip cache flow | include 059A

CAR

Router# (config) access-list 150 deny udp any any eq 1434

Router# (config) access-list 150 permit ip any any

Router# (config) interface fastEthernet 0/0

Router# (config-if) rate-limit input access-group rate-limit 150 8000 1500 20000 conform-action drop exceed-action drop

Router# (config-if) exit

Router# (config) exit

Router#

ACL补充

access-list 115 deny udp any any eq 1434

access-list 115 permit ip any any

int

ip access-group 115 in

ip access-group 115 out

注意,如果你想追踪来源,最好使用netflow,而不要使用log。

病毒发送大量随机地址,如果路由器接口使用了“ICMP unreachable”命令的话,对这些大量的无效地址响应将导致路由器性能下降。因此,推荐使用以下命令:

Router(config)# interface

Router(if-config)# no ip unreachables

ICMP unreachable 的补充

如果某些情况,如IP 隧道(tunnel)必须使用ICMP unreachable 命令,则推荐使用

Router(config)# ip icmp rate-limit unreachable

6500 上防御

set security acl ip WORM deny udp any eq 1434 any

set security acl ip WORM deny udp any any eq 1434

set security acl ip WORM permit any

commit security acl WORM

set security acl map WORM

查看

show security acl info all

CatOS SUPII 和 MLS

CatOS SUPII 和 MLS

源码:

switch> (enable) sh mls statistics entry ip

Last Used

Destination IP Source IP Prot DstPrt SrcPrt Stat-Pkts Stat-Bytes

10.81.176.91 172.16.34.35 UDP 1434 2776 0 0 172.31.171.82 172.16.34.35 UDP 1434 2776 0 0 168.192.57.204 172.16.188.61 UDP 1434 3460 1 404

172.17.136.55 172.16.34.135 UDP 1434 2917 0 0

从上面的显示我们可以发现,MLS可以帮助我们找到内部受感染主机

PIX

access-list acl_out permit udp any host eq 1434

或者

conduit permit udp any any eq 1434
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