CyberRota Analysis
AI-GeneratedPunk::OAuth2 versions prior to 0.03 for Perl are vulnerable to an open redirect flaw that allows attackers to craft a malicious link, leading users to an off-site destination after successful login. This vulnerability occurs due to improper validation of the return parameter, which accepts backslashes and tabs, enabling attackers to manipulate the redirect URL. Organizations using affected versions of Punk::OAuth2 should prioritize patching this vulnerability to prevent potential phishing attacks and unauthorized access.
Original NVD Description
Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter. oauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`. A crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.