Title: Surf-Net ASP Forum Predictable Cookie ID Vulnerability
Severity: MODERATE
Description:
Surf-Net ASP Forum is a free, open-source web-based message board.
Surf-Net ASP Forum allows users to rely upon cookie-based authentication. However, ASP Forum assigns a predictable sequence number when it saves a cookie on the machine of a user. Instead of attempting to randomize the ID number assigned to cookies, ASP Forums use a sequence number directly derived from the UserID of the forum user.
The code used to determine the cookie sequence number is as follows:
lngLoggedInUserID = CLng(Request.Cookies("Forum")("UserID") / 888888)
The administrative account has a UserID of 1, so it follows that the ID number in the cookie will be "0888888". A malicious user can exploit this issue by editing the cookie locally, substituting the admin cookie ID in the place of the one they were initially assigned.
Affected Products:
- Surf-Net ASP Forum 2.20.0
References:
- Surf-Net: ASP Forum Product Page
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