S3 Signature Image Retrieval Authorization Bypass in Snipe-IT

Detection Guidance

This vulnerability involves unauthorized generation of temporary signed S3 URLs for signature images in Snipe-IT versions 8.5.0 and earlier. Detection involves verifying if unauthorized users can obtain such URLs without proper authorization.

To detect this on your system, you can attempt to access signature image URLs by an authenticated user who should not have permission, and observe if a temporary signed S3 URL is generated without proper authorization.

Since the vulnerability is related to the Snipe-IT application behavior rather than network traffic patterns, direct network commands may not be sufficient. Instead, you can test the application endpoints manually or via scripts.

• Log in as an authenticated user with limited permissions.
• Attempt to access a known signature image URL or guess a signature filename.
• Check if the response contains a temporary signed S3 URL valid for 5 minutes.

For automated testing, you could use curl or similar tools to request signature image URLs and analyze the responses for temporary S3 URLs.

• curl -i -H "Authorization: Bearer <token>" https://<snipe-it-domain>/path/to/signature/image
• Inspect the response headers or body for a temporary S3 signed URL.

If such URLs are returned without proper authorization checks, the system is vulnerable.

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Executive Summary

This vulnerability affects Snipe-IT, an IT asset/license management system, in versions prior to 8.6.1. Specifically, the issue lies in the S3 signature image retrieval process where authorization is not properly enforced before generating a temporary URL. In S3-backed deployments, authenticated users who know the filename of a signature image can obtain a 5-minute signed S3 URL without proper authorization because the S3 branch returns the URL before the authorization check is performed, which is only done in the local-file branch.

This means that users with limited privileges might access signature images they should not be authorized to view.

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Impact Analysis

The vulnerability allows authenticated users to access temporary signed URLs for signature images without proper authorization. This could lead to unauthorized access to sensitive signature images stored in S3 for a short period (5 minutes).

While the CVSS score is low (1.3), indicating limited impact, unauthorized access to signature images could potentially expose sensitive information or be used in social engineering or identity spoofing attacks.

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Mitigation Strategies

To mitigate this vulnerability, upgrade Snipe-IT to version 8.6.1 or later, which contains a patch addressing the authorization bypass in S3 signature image retrieval.

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Compliance Impact

The vulnerability allows authenticated users to obtain a temporary signed S3 URL for signature images without proper authorization, potentially exposing sensitive asset/license management data.

This unauthorized access could lead to non-compliance with data protection regulations such as GDPR and HIPAA, which require strict access controls and protection of sensitive information.

However, the CVE description and available information do not explicitly mention the impact on compliance with these standards.

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