CVE-2023-46729 : Exploit Details and Defense Strategies

This article discusses a critical vulnerability in Sentry Next.js that allows Server-Side Request Forgery (SSRF) attacks via the Next.js SDK tunnel endpoint. Learn about the impact, technical details, and mitigation steps for CVE-2023-46729.

Understanding CVE-2023-46729

Sentry Next.js vulnerable to SSRF via Next.js SDK tunnel endpoint.

What is CVE-2023-46729?

sentry-javascript provides Sentry SDKs for JavaScript. An unsanitized input of Next.js SDK tunnel endpoint allows sending HTTP requests to arbitrary URLs and reflecting the response back to the user. This issue only affects users who have Next.js SDK tunneling feature enabled. The problem has been fixed in version 7.77.0.

The Impact of CVE-2023-46729

The vulnerability allows attackers to exploit the SSRF flaw, leading to high confidentiality and integrity impacts, with no privileges required. The base severity score is 9.3 (Critical).

Technical Details of CVE-2023-46729

Vulnerability Description

The vulnerability arises due to unsanitized input in Next.js SDK tunnel endpoint allowing HTTP requests to arbitrary URLs, making it susceptible to SSRF attacks.

Affected Systems and Versions

Vendor: getsentry
Product: sentry-javascript
Affected Versions: >= 7.26.0, < 7.77.0

Exploitation Mechanism

Attackers exploit the unsanitized input of the Next.js SDK tunnel endpoint to send malicious HTTP requests to external URLs, potentially leading to SSRF attacks.

Mitigation and Prevention

Immediate Steps to Take

Users are advised to upgrade to version 7.77.0 or above to mitigate the vulnerability. Disable the Next.js SDK tunneling feature if not required to prevent SSRF attacks.

Long-Term Security Practices

Implement input validation mechanisms, sanitize user inputs, and regularly update Sentry SDKs to avoid similar vulnerabilities in the future.

Patching and Updates

Refer to the provided GitHub links for the patch and updates for sentry-javascript to address the CVE-2023-46729 vulnerability.