2.7

CVSS Score

4.0

-

CVSS Score

Basic Information

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CVE-2025-61594

CVE-2025-61594: URI Credential Leakage Bypass over CVE-2025-27221

URI is a module providing classes to handle Uniform Resource Identifiers. In versions prior to 0.12.5, 0.13.3, and 1.0.4, a bypass exists for the fix to CVE-2025-27221 that can expose user credentials. When using the + operator to combine URIs, sensitive information like passwords from the original URI can be leaked, violating RFC3986 and making applications vulnerable to credential exposure. Versions 0.12.5, 0.13.3, and 1.0.4 fix the issue.

(GitHub Advisory)

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CVE-2025-61594

CVE-2025-61594:

2.7

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
uri	rubygems	< 0.12.5	0.12.5
uri	rubygems	>= 0.13.0, < 0.13.3	0.13.3
uri	rubygems	>= 1.0.0, < 1.0.4	1.0.4

Technical Details

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Root Cause Analysis

The vulnerability is a credential leakage issue in the uri gem, stemming from the improper handling of the URI authority component (userinfo, host, port). The primary exploit vector is the + operator, which is an alias for the merge method in the URI::Generic class.

The analysis of the patches reveals that the merge method's logic was flawed. It did not treat the authority component as an atomic unit, allowing userinfo from one URI to be combined with the host of another, leading to credential leakage. The fix introduces a new authority method to handle this component correctly.

Furthermore, several setter methods (set_userinfo, set_user, host=, port=) had insecure default behaviors. They would fail to clear stale credentials when parts of the URI were updated. For instance, changing the host did not clear the userinfo, causing the old credentials to be associated with a new host. The patches rectify this by explicitly clearing userinfo in these setters.

Therefore, the vulnerable functions are URI::Generic#merge as the main entry point for the described attack, and the setters URI::Generic#set_userinfo, URI::Generic#set_user, URI::Generic#host=, and URI::Generic#port= for their role in the insecure state management of URI objects.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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