Jon Oberheide has reported two vulnerabilities in CoSign, which can be exploited by malicious users to hijack other user sessions and by malicious people to bypass certain security restrictions.
Certain input passed via POST requests are not properly sanitised before being used by the daemon. These can be exploited to insert certain commands via carriage return sequences in the cookie or data of a POST request.
Successful exploitation e.g. allows a non-authenticated user to bypass the authentication mechanism and an authenticated user to assume the identity of other users.
The vulnerabilities are reported in versions 2.0.1 and 2.0.2. Other versions may also be affected.
Solution: Apply patch or update to version 2.0.2a or 1.9.4b.
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Subject: CoSign POST Request Carriage Return Insertion Vulnerabilities
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