Executive Summary

This vulnerability exists in the NousResearch hermes-agent software, specifically in the function resolve_session_by_title within the hermes_state.py file of the resume Endpoint component. The issue arises when the argument Title is manipulated, which leads to an authorization bypass. This means an attacker can potentially gain unauthorized access by exploiting this flaw.

The attack can be launched remotely, and the exploit has already been publicly disclosed. The vendor was informed early but did not respond.

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Impact Analysis

This vulnerability can allow an attacker to bypass authorization controls remotely, potentially gaining access to restricted sessions or data that should be protected. This unauthorized access could lead to exposure of sensitive information or unauthorized actions within the affected system.

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Compliance Impact

This vulnerability allows unauthorized access to user sessions, exposing sensitive data such as API keys, personally identifiable information (PII), and system information. Such unauthorized data exposure and access can lead to violations of data protection regulations like GDPR and HIPAA, which mandate strict controls over access to personal and sensitive information.

Because the vulnerability enables session hijacking without authentication, it undermines confidentiality and integrity requirements critical to compliance with these standards. Organizations using affected versions of Hermes Agent may face increased risk of non-compliance due to potential data breaches resulting from this flaw.

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Detection Guidance

This vulnerability can be detected by checking for unauthorized access or session hijacking attempts involving the Hermes Agent's /resume command or the resolve_session_by_title function. Since the exploit involves guessing or enumerating session titles to gain unauthorized access, monitoring logs for unusual or repeated access attempts to session titles can help detect exploitation.

Specifically, you can look for calls to the resolve_session_by_title function or database queries that retrieve session data without user identity filtering.

While no exact commands are provided in the resources, a general approach would be to audit database queries related to session titles and monitor network traffic for suspicious requests targeting the /resume endpoint or similar API calls.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the Hermes Agent instance to trusted users only, as the vulnerability requires only the ability to guess or enumerate session titles.

Since no patched versions are currently available, consider implementing network-level controls such as firewall rules or VPNs to limit exposure.

Additionally, monitor and audit session creation and access logs to detect suspicious activity and consider rotating any sensitive data (e.g., API keys) that may have been exposed.

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