DoS, CSRF and XSS vulnerabilities in ADSL modem Callisto 821+

Type securityvulns
Reporter Securityvulns
Modified 2011-06-17T00:00:00


Hello 3APA3A!

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

These are Denial of Service, 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 ( for conducting of remote login (for logining him into control panel). After that it's possible to conduct DoS, CSRF or XSS attack.

DoS (WASC-10):

At these requests the restart of modem occurs, at which both admin panel and modem itself aren't accessible (so connection to Internet is absent).


This vulnerability allows to conduct clearing of statistics of selected VLAN port.

XSS (WASC-08):

On above-mentioned page there is a persistent XSS vulnerability.

In this case the code will be executed immediately, and also at visiting of pages and

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 (

Best wishes & regards, MustLive Administrator of Websecurity web site