Title: 123 Flash Chat Server Arbitrary Remote File Creation Vulnerability
Severity: MODERATE
Description:
123 Flash Chat server is a commercial real-time chat product implemented in Java.
123 Flash Chat server is susceptible to an arbitrary remote file creation vulnerability. This issue is due to a lack of proper input sanitization of user-supplied data.
Specifically, the username and password input fields used when creating new users are not properly sanitized.
The server creates a file, or overwrites existing files for each new user with a filename that is directly derived from the user-supplied username. Attackers specifying '../' directory traversal sequences can specify arbitrary filenames to overwrite.
The password field is completely unsanitized, allowing newline characters. As the password is contained in the newly created file. Attackers can therefore partially control the contents of these files, potentially aiding them in further attacks.
This issue allows remote attackers to create or overwrite arbitrary files on the server computer. This occurs with the privileges of the server process.
This issue affects versions 5.0, and 5.1 of 123 Flash Chat server; previous versions may also be affected.
Affected Products:
- TopCMM Computing 123 Flash Chat Server 5.0.0
- TopCMM Computing 123 Flash Chat Server 5.1.0
References:
- TopCMM Computing: 123 Flash Chat Homepage
- TopCMM Computing: 123 flash chat server software 5.1_2 released!
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