Insecure Direct Object Reference in OpenSignLabs OpenSign

Executive Summary

This vulnerability is an insecure direct object reference in OpenSignLabs OpenSign through version 2.37.0. It allows unauthenticated remote attackers to write to any contact record using the updatecontacttour Parse cloud function. The function lacks authentication or authorization checks, enabling attackers to corrupt or overwrite contact data for any user without credentials.

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Detection Guidance

To detect this vulnerability, monitor network traffic for unauthorized POST requests to the Parse cloud function 'updatecontacttour' in OpenSign. Check logs for unauthenticated contact record modifications. Use tools like Wireshark or tcpdump to inspect traffic to the OpenSign API endpoints.

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Impact Analysis

An attacker could exploit this to modify or delete contact information for any user in the system. This could lead to data loss, incorrect records, or disruption of services relying on accurate contact data. If used maliciously, it may also enable phishing or social engineering attacks by altering trusted contact details.

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Compliance Impact

This vulnerability could violate GDPR by enabling unauthorized modification of personal data, undermining integrity and accountability requirements. For HIPAA, it risks exposing or altering protected health information, potentially breaching confidentiality and integrity rules. Compliance may be compromised due to unauthorized data changes and lack of access controls.

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Mitigation Strategies

Immediately update OpenSign to the latest version beyond 2.37.0 to patch the insecure direct object reference in the updatecontacttour Parse cloud function. Disable or restrict access to the vulnerable cloud function if an update is not immediately available. Monitor network traffic for unauthorized write operations to contact records.

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