ChatGPT Guardrail Bypass Exploited via Local File Inclusion Vulnerability
A now-patched vulnerability in ChatGPT allowed attackers to bypass security guardrails through a Local File Inclusion (LFI) exploit via its file download mechanism. The flaw, discovered by security researcher zer0dac, stemmed from a logic error in how the system handled temporary file access and download requests.
Under normal operation, ChatGPT enforces strict controls on uploaded files, treating them as temporary artifacts and blocking direct download attempts. However, zer0dac found that by first prompting the model to "edit" an uploaded file and then requesting a recovery download link posing as an accidental deletion the system generated a valid URL, circumventing intended restrictions.
The exposed endpoint revealed internal file storage paths (e.g., /mnt/data/test.html) and included parameters like conversation and message IDs. By appending path traversal sequences (e.g., /mnt/data/test.html/../../../../etc/passwd), the researcher successfully retrieved the system’s /etc/passwd file, confirming the LFI exploit.
While the environment was sandboxed, limiting direct access to sensitive host resources, the vulnerability highlighted risks in multi-stage attacks, such as data exfiltration or privilege escalation. OpenAI addressed the issue by redesigning the download URL flow and strengthening file path validation, reinforcing the need for robust state management in LLM-integrated systems.
The incident underscores a broader trend in AI security: logic flaws in workflows and guardrails, rather than traditional memory corruption bugs, are increasingly becoming primary attack vectors. As LLM applications expand, rigorous validation across conversational states and backend integrations remains critical to preventing exploitation.
Source: https://gbhackers.com/chatgpt-guardrail-bypass-vulnerability/
OpenAI cybersecurity rating report: https://www.rankiteo.com/company/openai
"id": "OPE1783067213",
"linkid": "openai",
"type": "Vulnerability",
"date": "1/2025",
"severity": "60",
"impact": "3",
"explanation": "Attack with significant impact with internal employee data leaks"{'affected_entities': [{'industry': 'Artificial Intelligence',
'name': 'OpenAI',
'type': 'Technology / AI'}],
'attack_vector': 'Local File Inclusion (LFI) via file download mechanism',
'data_breach': {'file_types_exposed': ['Text files (e.g., `/etc/passwd`)'],
'sensitivity_of_data': 'Low (sandboxed environment)',
'type_of_data_compromised': 'System files'},
'description': 'A now-patched vulnerability in ChatGPT allowed attackers to '
'bypass security guardrails through a Local File Inclusion '
'(LFI) exploit via its file download mechanism. The flaw, '
'discovered by security researcher zer0dac, stemmed from a '
'logic error in how the system handled temporary file access '
'and download requests. The exposed endpoint revealed internal '
'file storage paths and allowed path traversal sequences to '
'retrieve system files like `/etc/passwd`. OpenAI addressed '
'the issue by redesigning the download URL flow and '
'strengthening file path validation.',
'impact': {'brand_reputation_impact': 'Highlighted risks in AI security '
'guardrails',
'data_compromised': 'System files (e.g., `/etc/passwd`)',
'operational_impact': 'Potential for data exfiltration or '
'privilege escalation in multi-stage attacks',
'systems_affected': 'ChatGPT file handling system'},
'investigation_status': 'Resolved',
'lessons_learned': 'Logic flaws in workflows and guardrails, rather than '
'traditional memory corruption bugs, are increasingly '
'becoming primary attack vectors in AI security. Rigorous '
'validation across conversational states and backend '
'integrations is critical to preventing exploitation.',
'motivation': 'Security research / vulnerability disclosure',
'post_incident_analysis': {'corrective_actions': 'Redesigned download URL '
'flow and strengthened file '
'path validation',
'root_causes': 'Logic error in temporary file '
'access and download request '
'handling'},
'recommendations': 'Implement robust state management in LLM-integrated '
'systems, enforce strict file path validation, and conduct '
'thorough security testing of multi-stage workflows.',
'references': [{'source': 'Security researcher zer0dac'}],
'response': {'containment_measures': 'Redesigned download URL flow',
'remediation_measures': 'Strengthened file path validation'},
'threat_actor': 'zer0dac (security researcher)',
'title': 'ChatGPT Guardrail Bypass Exploited via Local File Inclusion '
'Vulnerability',
'type': 'Logic Flaw / Guardrail Bypass',
'vulnerability_exploited': 'Logic error in temporary file access and download '
'request handling'}