Executive Summary

This vulnerability in Open WebUI involves the cleartext transmission of credentials to an endpoint, allowing network-adjacent attackers to intercept and disclose sensitive credential information without needing authentication. The flaw arises because sensitive information is sent in plaintext, making it accessible to attackers on the same network. [1]

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Impact Analysis

An attacker on the same network can exploit this vulnerability to obtain sensitive credentials transmitted in plaintext. This disclosure can lead to further compromise of the affected system or network, as the attacker may use the stolen credentials to gain unauthorized access. [1]

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Detection Guidance

This vulnerability can be detected by monitoring network traffic for cleartext transmission of credentials to the Open WebUI endpoint. Network-adjacent attackers can intercept these transmissions. Using packet capture tools like tcpdump or Wireshark, you can filter for traffic to the Open WebUI service and inspect for plaintext credentials. For example, a command like 'tcpdump -i <interface> -A port <open_webui_port>' can be used to capture and display ASCII data on the relevant port to identify cleartext credentials. [1]

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Mitigation Strategies

Immediate mitigation steps include restricting network access to the Open WebUI service to trusted hosts only, using network segmentation to limit exposure, and monitoring network traffic for suspicious activity. Since the vulnerability involves cleartext transmission of credentials, avoid using the affected Open WebUI version until a patch or update is available. Employing encrypted tunnels (e.g., VPN or SSH) to protect credentials in transit can also help reduce risk. [1]

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