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Multiple Flaws in Huawei D100
From: filip.palian () pjwstk edu pl
Date: Tue, 30 Jun 2009 05:16:38 -0600

Multiple Flaws in Huawei D100

by Filip Palian <filip (dot) palian (at) pjwstk (dot) edu (dot) pl

Huawei D100 is a device offered by the polish telecom operator - Play, to provide broadband Internet in CDMA technology 
and it's already widely in use.

Huawei D100 firmware and its default configuration has flaws, which allows LAN users to gain unauthorized full access 
to device.

#1 No HTTPS support for the web interface
Communication to the web interface can be sniffed by the attacker.

#2 System doesn't force administrator to change default password upon first login
Many administrators leave it unchanged.

#3 Brute-force attack on admin account
Login attempts are not limited at all.

#4 Login and password stored in cookie
Admisnitrator's login and password are stored in a cookie in plain text.

#5 Wi-Fi enabled by default
Anyone can connect to the LAN without any problems.

#6 Wi-Fi encryption is disabled by default
Communication in the LAN can be sniffed by the attacker.

#7 SSID broadcast is enabled by default
Anyone can connect to the LAN without any problems.

#8 Partial information leakage
Unauthorized users have access to information stored on router when JavaScript is disabled in the browser. Examples:

#9 Telnet service enabled by default
Anyone in LAN is able to log in using default admin:admin account with root privileges. There is no possibility to 
change this password (sic!). This account has nothing in common with the administrator account in web based managment 

At the moment no fixes were provided by the vendor. As a workaround administrator should:
#1 change the default administrator password (still can be sniffed in LAN)
#2 enable Wi-Fi encryption
#3 turn on clients MAC addresses filtering
#4 turn off SSID broadcasting
#5 restrict access to telnet service using build-in firewall

Disclousure timeline:
23 VI 2009: Detailed information with examples, PoCs, terms of cooperation and the planned disclosure date sent to the 
vendor (ok () pomocplay pl).
        : No response from the vendor.
29 VI 2009: Resend notification with an indication this will be the last attempt to responsibly disclose.
        : No response from the vendor.
30 VI 2009: Security bulletin released.
        Response: ?

The vendor hasn't responded at all. The bulletin was released in hope that users will be able to protect themselves 
against threats described above before vendor will realese fixes and before the bad guys will reach them first.

* http://playmobile.pl/
* http://www.huawei.com/

Best regards,
Filip Palian

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