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CVE-2025-62705

CVE-2025-62705: OpenBao and Vault Leak []byte Fields in Audit Logs

Impact

OpenBao's audit log did not appropriately redact fields when relevant subsystems sent []byte response parameters rather than strings. This includes, but is not limited to:

sys/raw with use of encoding=base64, all data would be emitted unredacted to the audit log.
Transit, when performing a signing operation with a derived Ed25519 key, would emit public keys to the audit log.

Third-party plugins may be affected.

This issue has been present since HashiCorp Vault and continues to impact Vault as of v1.20.4.

Patches

OpenBao v2.4.2 will patch this issue.

Workarounds

If users do not use the above functionality, they are not impacted. To prohibit the use of sys/raw globally, ensure raw_storage_endpoint=false is set or missing from the server configuration.

(GitHub Advisory)

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CVE-2025-62705

CVE-2025-62705:

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/openbao/openbao	go	< 0.0.0-20251022165510-cc2c476bac66	0.0.0-20251022165510-cc2c476bac66

Technical Details

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Root Cause Analysis

The vulnerability lies in the improper handling of []byte data types within the audit logging subsystem of OpenBao. When a response from a subsystem like sys/raw contained sensitive data in a []byte field, the audit logging mechanism failed to redact or HMAC this data before writing it to the audit log.

The root cause was in the audit.HashResponse and audit.HashStructure functions. The process involved creating a JSON-marshalled copy of the response data. This conversion turned []byte slices into base64-encoded strings. However, the core hashing logic, implemented in audit.HashStructure and its internal hashWalker, was designed to walk the original data structure and only acted upon fields that were of type string. It did not have a mechanism to handle []byte fields, so they were never passed to the hashing callback. Consequently, the base64-encoded (and thus easily decodable) sensitive data was persisted in the audit logs.

The patch addresses this by refactoring the entire data walking and hashing mechanism. It now operates on a single data structure that has been processed by json.Marshal and json.Unmarshal, ensuring type consistency. The new logic correctly identifies and hashes all string values that are not explicitly ignored, which now includes the base64-encoded representations of the original []byte fields, effectively redacting the sensitive information.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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CVE-2025-62705: OpenBao and Vault Leak []byte Fields in Audit Logs

Impact

Patches

Workarounds

CVE-2025-62705:

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Technical Details

Technical Details

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Root Cause Analysis

Vulnerable functions

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Reasoning

Basic Information

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Root Cause Analysis

Vulnerable functions

Technical Details

CVE-2025-62705: OpenBao and Vault Leak []byte Fields in Audit Logs

Impact

Patches

Workarounds

N/A

N/A

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
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