Description

LimeSurvey constructs account password-reset links from the client-supplied HTTP Host header without validating it. The optional allowedHosts allowlist that would constrain this is undefined in the default (and documented) configuration, so LSHttpRequest::checkIsAllowedHost() results in no operation. A remote, unauthenticated attacker who submits a forgotten-password request for a known account (requiring only the target's username and email) with a spoofed Host header causes LimeSurvey to email that account a reset link whose hostname is attacker-controlled while embedding the genuine validation_key. When the recipient or an automated inbound mail-security link scanner dereferences the link, the valid reset token is disclosed to the attacker, who replays it against the legitimate host's newPassword endpoint to set a new password and take over the account.

Weaknesses 1

References 3

• github.com https://github.com/LimeSurvey/LimeSurvey/pull/5032
• limesurvey.org https://www.limesurvey.org/
• vulncheck.com https://www.vulncheck.com/advisories/limesurvey-password-reset-host-header-injection-discloses-reset-token

Remediation