Privileged OpenBao Operator May Execute Code on the Underlying Host

Description

Impact

Under certain threat models, OpenBao operators with privileged API access may not be system administrators and thus normally lack the ability to update binaries or execute code on the system. Additionally, privileged API operators should be unable to perform TCP connections to arbitrary hosts in the environment OpenBao is executing within. The API-driven audit subsystem granted privileged API operators the ability to do both with an attacker-controlled log prefix. Access to these endpoints should be restricted.

Patches

OpenBao v2.3.2 will patch this issue.

Workarounds

Users may deny all access to the sys/audit/* interface (with create and update) permission via policies with explicit deny grants. This would not restrict root level operators, however, for whom there are no workarounds.

This interface allowed arbitrary filesystem and network (write) access as the user the OpenBao server was running as; in conjunction with allowing custom plugins or other system processes this may enable code execution.

References

This issue was disclosed to HashiCorp and is the OpenBao equivalent of the following tickets:

  • https://discuss.hashicorp.com/t/hcsec-2025-14-privileged-vault-operator-may-execute-code-on-the-underlying-host/76033
  • https://nvd.nist.gov/vuln/detail/CVE-2025-6000

Basic information

Type
reviewed
Severity
critical
Advisory on GitHub
Open advisory ↗
Repository advisory
Open repository advisory ↗
Source code
Browse source ↗
Published (advisory)
2025-08-08 14:37:22 UTC
Updated
2025-08-11 13:56:31 UTC
GitHub reviewed
2025-08-08 14:37:22 UTC
NVD published
2025-08-09 03:15:46 UTC

EPSS Score

Score Percentile
0.17% 37.77%

CVSS Scores

Base score Version Severity Vector
9.1 3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

CWEs

CWE id Name
CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected packages (2)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
go github.com/openbao/openbao >= 0.1.0, < 2.3.2 2.3.2
go github.com/openbao/openbao < 0.0.0-20250806194004-a14053c9679d 0.0.0-20250806194004-a14053c9679d

References

cvelogic Threat Intelligence