Nathan Dors of the Pubcookie Project reports:
Multiple non-persistent XSS vulnerabilities were found in the Pubcookie login server's compiled binary "index.cgi" CGI program. The CGI program mishandles untrusted data when printing responses to the browser. This makes the program vulnerable to carefully crafted requests containing script or HTML. If an attacker can lure an unsuspecting user to visit carefully staged content, the attacker can use it to redirect the user to his or her local Pubcookie login page and attempt to exploit the XSS vulnerabilities.
These vulnerabilities are classified as *critical* due to the nature and purpose of the Pubcookie login server for user authentication and Web Single Sign-on (SSO). Specific threats include:
- An attacker who injects malicious script through the vulnerabilities might steal senstive user data including a user's authentication credentials (usernames and passwords);
- An attacker who injects malicious script through the vulnerabilities might steal private Pubcookie data including a user's authentication assertion ("granting") cookies and SSO ("login") session cookies;
- An attacker who injects HTML tags through the vulnerabilities might deface a site's Pubcookie login page for a single visit by a single user (i.e. a non-persistent defacement).
At the heart of these threats lies a violation of the user's trust in the Pubcookie login server.
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