New vulnerabilities in ADSL modem Callisto 821+

Hello 3APA3A!

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

These are Cross-Site Request Forgery and Cross-Site Scripting
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 or XSS attack.

CSRF (WASC-09):

This vulnerability allows to set name for DNS relay local LAN
database. This DB will be working only if its name is set (i.e. it's
possible to deactivate it if to set empty value).

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20CSRF12.html

In section Create new DNS relay local LAN database entry
(http://192.168.1.1/configuration/create_landb_host.html) via CSRF
it's possible to add, edit and delete hosts in this DB.

XSS (WASC-08):

In above-mentioned form there are 3 persistent XSS vulnerabilities.

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20XSS17.html

In this case the code will be executed immediately, and also at
visiting of page
http://192.168.1.1/configuration/dns_relay_landb.html.

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20XSS18.html

In this case the code will be executed immediately, and also at
visiting of pages http://192.168.1.1/system/events.html and
http://192.168.1.1/shared/event_log_selection.html.

http://websecurity.com.ua/uploads/2011/Callisto%20821+%20XSS19.html

In this case the code will be executed immediately, and also at
visiting of pages http://192.168.1.1/system/events.html and
http://192.168.1.1/shared/event_log_selection.html.

In section Create new DNS relay local LAN database entry
(http://192.168.1.1/configuration/create_landb_host.html) there are
persistent XSS vulnerabilities in all text fields and some hidden
fields.

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/5193/).

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