7.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-13357

CVE-2025-13357: Vault’s Terraform Provider incorrectly set default deny_null_bind parameter for LDAP auth method to false by default

Vault’s Terraform Provider incorrectly set the default deny_null_bind parameter for the LDAP auth method to false by default, potentially resulting in an insecure configuration. If the underlying LDAP server allowed anonymous or unauthenticated binds, this could result in authentication bypass. This vulnerability, CVE-2025-13357, is fixed in Vault Terraform Provider v5.5.0.

(GitHub Advisory)

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CVE-2025-13357

CVE-2025-13357:

7.4

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/hashicorp/terraform-provider-vault	go	< 5.5.0	5.5.0

Technical Details

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Root Cause Analysis

The vulnerability lies in the default configuration of the vault_ldap_auth_backend resource within the Vault Terraform Provider. The analysis of the provided patch 882bc7f409acc99c872c345edd65159d9568589a pinpoints the exact location of the fix. The file vault/resource_ldap_auth_backend.go was modified to change how the resource is defined. Specifically, the function ldapAuthBackendResource was updated. This function is responsible for creating the schema and behavior of the vault_ldap_auth_backend resource. The patch introduces a CustomizeDiff block. This block checks if the deny_null_bind parameter has been set by the user. If it hasn't, it programmatically sets the value to true before the configuration is applied. This directly addresses the vulnerability, which was that the parameter would previously default to false (an insecure setting that allows anonymous LDAP binds). Therefore, vault.ldapAuthBackendResource is the key function, as its incorrect definition of the resource's default behavior is the root cause of the vulnerability. Any Terraform operation (plan, apply) involving this resource would execute the logic within this function.

Vulnerable functions

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WAF Rule

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Reasoning

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