9.8

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2016-7954

CVE-2016-7954: Bundler allows attacker to inject arbitrary code via secondary Gem source

Bundler 1.x might allow remote attackers to inject arbitrary Ruby code into an application by leveraging a gem name collision on a secondary source. NOTE: this might overlap CVE-2013-0334.

(GitHub Advisory)

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CVE-2016-7954

CVE-2016-7954:

9.8

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
bundler	rubygems	>= 1.0.0, < 2.0.0	2.0.0

Technical Details

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Root Cause Analysis

The vulnerability arises from Bundler 1.x's handling of multiple gem sources. When a secondary source is specified (even with scoping), the resolver prioritizes it globally due to flawed source aggregation logic. The SourceList#aggregate_global_source method merges all sources into a global list, bypassing scoping constraints. The Resolver#resolve method then selects gems from this aggregated list, allowing malicious gems from secondary sources to override legitimate ones. These functions are central to the vulnerability, as confirmed by the documented behavior where scoped sources unexpectedly affect all gems. The Bundler team addressed this in 2.0 by redesigning source handling, further implicating these components.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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