CVE-2023-49785: nextchat XSS — Exploit & Fix

Description

NextChat, also known as ChatGPT-Next-Web, is a cross-platform chat user interface for use with ChatGPT. Versions 2.11.2 and prior are vulnerable to server-side request forgery and cross-site scripting. This vulnerability enables read access to internal HTTP endpoints but also write access using HTTP POST, PUT, and other methods. Attackers can also use this vulnerability to mask their source IP by forwarding malicious traffic intended for other Internet targets through these open proxies. As of time of publication, no patch is available, but other mitigation strategies are available. Users may avoid exposing the application to the public internet or, if exposing the application to the internet, ensure it is an isolated network with no access to any other internal resources.

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CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
nextchat	nextchat	< 2.11.2

References

Advisories & Patches

https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web/pull/4285

Exploits

https://www.horizon3.ai/attack-research/attack-blogs/nextchat-an-ai-chatbot-that-lets-you-talk-to-anyone-you-want-to/ https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web/issues/4283 https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web/pull/4285 https://www.horizon3.ai/attack-research/attack-blogs/nextchat-an-ai-chatbot-that-lets-you-talk-to-anyone-you-want-to/ https://www.vicarius.io/vsociety/posts/hacking-ai-chatbots-for-fun-and-learning-analyzing-an-unauthenticated-ssrf-and-reflected-xss-in-chatgpt-next-web-cve-2023-49785 https://www.vicarius.io/vsociety/posts/hacking-ai-chatbots-for-fun-and-learning-analyzing-an-unauthenticated-ssrf-and-reflected-xss-in-chatgpt-next-web-cve-2023-49785

Other References

https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web https://github.com/ChatGPTNextWeb/ChatGPT-Next-Web

Frequently Asked Questions

What is CVE-2023-49785? +

NextChat, also known as ChatGPT-Next-Web, is a cross-platform chat user interface for use with ChatGPT. Versions 2.11.2 and prior are vulnerable to server-side request forgery and cross-site scripting. This vulnerability enables read access to internal HTTP endpoints but also write access using HTTP POST, PUT, and other methods. Attackers can also use this vulnerability to mask their source IP by forwarding malicious traffic intended for other Internet targets through these open proxies. As of time of publication, no patch is available, but other mitigation strategies are available. Users may avoid exposing the application to the public internet or, if exposing the application to the internet, ensure it is an isolated network with no access to any other internal resources. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2023-49785? +

CVE-2023-49785 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2023-49785? +

CVE-2023-49785 affects products from nextchat, specifically: nextchat. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-49785? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2023-49785