3.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2021-3644

CVE-2021-3644: wildfly-core allows user with access to management interface to access vault expression, retrieve item from vault

A flaw was found in wildfly-core in all versions. If a vault expression is in the form of a single attribute that contains multiple expressions, a user who was granted access to the management interface can potentially access a vault expression they should not be able to access and possibly retrieve the item which was stored in the vault. The highest threat from this vulnerability is data confidentiality and integrity.

(GitHub Advisory)

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CVE-2021-3644

CVE-2021-3644:

3.3

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
org.wildfly.core:wildfly-server	maven	< 16.0.1.Final	16.0.1.Final
org.wildfly.core:wildfly-server	maven	>= 17.0.0.Beta2, < 17.0.0.Beta3	17.0.0.Beta3

Technical Details

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Root Cause Analysis

The vulnerability stems from improper sensitivity classification of vault expressions in multi-expression attributes. The commit diff shows the patched version replaced the original two-step check (ExpressionResolver.EXPRESSION_PATTERN followed by VaultReader.STANDARD_VAULT_PATTERN) with a single comprehensive regex (VAULT_EXPRESSION_PATTERN) that scans the entire attribute value. The test case added in VaultExpressionSensitivityTestCase.java demonstrates how an attacker could previously inject a vault expression alongside other content. The isSensitiveValue function's pre-patch logic failed to detect vault expressions when they weren't the sole expression in the attribute, making it the clear vulnerable function.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

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WAF Rule

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Reasoning

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