CSRF vulnerabilities in ADSL modem Callisto 821+

Hello 3APA3A!

I want to warn you about security vulnerabilities in ADSL modem
Callisto 821+ (SI2000 Callisto821+ Router).

These are Cross-Site Request Forgery vulnerabilities. In April I've
already drew attention of Ukrtelecom's representative (and this modem
was bough at Ukrtelecom) about multiple vulnerabilities in this model
of Callisto modems (and other models also could be affected).

These attacks should be conducted on modem owner, which is logged
into control panel. Taking into account that it's unlikely to catch
him in this state, then it's possible to use before-mentioned
vulnerabilities (http://websecurity.com.ua/5161/) for conducting of
remote login (for logining him into control panel). After that it's
possible to conduct CSRF attack.

CSRF (WASC-09):

This vulnerability allows to open remote (external) access to admin
panel. By default access is possible only from local computer (and
LAN), but at turning this option on it's possible to enter into admin
panel from Internet. At that the time is set on which remote access
is opened.

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20CSRF3.html

This vulnerability allows to conduct modem restart and reset to
factory default settings.

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20CSRF4.html

Vulnerable is the next model: SI2000 Callisto821+ Router: X7821
Annex A v1.0.0.0 / Argon 4x1 CSP v1.0 (ISOS 9.0) [4.3.4-5.1]. This
model with other firmware and also other models of Callisto also must
be vulnerable.

I mentioned about these vulnerabilities at my site
(http://websecurity.com.ua/5172/).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua