Overview

The Vault 1.15.x upgrade guide contains information on deprecations, important or breaking changes, and remediation recommendations for anyone upgrading from Vault 1.14. Please read carefully.

Consul service registration

As of version 1.15, service_tags supplied to Vault for the purpose of Consul service registration will be case-sensitive.

In previous versions of Vault tags were converted to lowercase which led to issues, for example when tags contained Traefik rules which use case-sensitive method names such as Host().

If you previously used Consul service registration tags ignoring case, or relied on the lowercase tags created by Vault, then this change may cause unexpected behavior.

Please audit your Consul storage stanza to ensure that you either:

• Manually convert your service_tags to lowercase if required
• Ensure that any system that relies on the tags is aware of the new case-preserving behavior

Rollback metrics

Vault no longer measures and reports the metrics vault.rollback.attempts.{MOUNTPOINT} and vault.route.rollback.{MOUNTPOINT} by default. The new default metrics are vault.rollback.attempts and vault.route.rollback, which do not contain the mount point in the metric name.

To continue measuring vault.rollback.attempts.{MOUNTPOINT} and vault.route.rollback.{MOUNTPOINT}, you must explicitly enable mount-specific metrics in the telemetry stanza of your Vault configuration with the add_mount_point_rollback_metrics option.

Application of Sentinel Role Governing Policies (RGPs) via identity groups

As of versions 1.15.0, 1.14.4, and 1.13.8, the Sentinel RGPSs derived from membership in identity groups apply only to entities in the same and child namespaces, relative to the identity group.

Also, the group_policy_application_mode only applies to to ACL policies. Vault Sentinel Role Governing Policies (RGPs) are not affected by group policy application mode.

Known issues and workarounds

Transit Encryption with Cloud KMS managed keys causes a panic

Affected versions

• 1.13.1+ up to 1.13.8 inclusively
• 1.14.0+ up to 1.14.4 inclusively
• 1.15.0

Issue

Vault panics when it receives a Transit encryption API call that is backed by a Cloud KMS managed key (Azure, GCP, AWS).

Workaround

None at this time

Transit Sign API calls with managed keys fail

Affected versions

• 1.14.0+ up to 1.14.4 inclusively
• 1.15.0

Issue

Vault responds to Transit sign API calls with the following error when the request uses a managed key:

requested version for signing does not contain a private part

Workaround

None at this time

Panic in AWS auth method during IAM-based login

Affected versions

• 1.15.0

Issue

A panic can occur in the AWS auth method during IAM-based login when a client config does not exist.

Workaround

The panic can be avoided by writing an empty client config:

vault write -f auth/aws/config/client

Collapsed navbar does not allow you to click inside the console or namespace picker

Affected versions

The UI issue affects Vault versions 1.14.0+ and 1.15.0+. A fix is expected for Vault 1.16.0.

Issue

The Vauil UI currently uses a version of HDS that does not allow users to click within collapsed elements. In particular, the dev console or namespace picker become inaccessible when viewing the components in smaller viewports.

Workaround

Expand the width of the screen until you deactivate the collapsed view. Once the full navbar is displayed, click the desired components.

File audit devices do not honor SIGHUP signal to reload

Affected versions

• 1.15.0

Issue

The new underlying event framework for auditing causes Vault to continue using audit log files instead of reopening the file paths even when you send SIGHUP after log rotation. The issue impacts any Vault cluster with file audit devices enabled.

Not honoring the SIGHUP signal has two key consequences when moving or deleting audit files.

If you move or rename your audit log file locally, Vault continues to log data to the original file. For example, if you archive a file locally:

$ mv /var/log/vault/audit.log /var/log/vault/archive/audit.log.bak

Vault continues to write data to /var/log/vault/archive/audit.log.bak instead of logging audit entries to a newly created file at /var/log/vault/audit.log.

If you delete your audit log file, the OS unlinks the file from the directory structure, but Vault still has the file open. Vault continues to write data to the deleted file, which continues to consume disk space as it grows. When Vault is sealed or restarted, the OS deletes the previously unlinked file, and you will lose all data logged to the audit file after it was tagged for deletion.

The issue with file audit devices not honoring SIGHUP signals is fixed as a patch release in Vault 1.15.1.

Workaround

Set the VAULT_AUDIT_DISABLE_EVENTLOGGER environment variable to true to disable the new underlying event framework and restart Vault:

$ export VAULT_AUDIT_DISABLE_EVENTLOGGER=true

On startup, Vault reverts to the audit behavior used in 1.14.x.

Internal error when vault policy in namespace does not exist

If a user is a member of a group that gets a policy from a namespace other than the one they’re trying to log into, and that policy doesn’t exist, Vault returns an internal error. This impacts all auth methods.

Affected versions

• 1.13.8 and 1.13.9
• 1.14.4 and 1.14.5
• 1.15.0 and 1.15.1

A fix will be released in Vault 1.15.2, 1.14.6, and 1.13.10.

Workaround

During authentication, Vault derives inherited policies based on the groups an entity belongs to. Vault returns an internal error when attaching the derived policy to a token when:

1. the token belongs to a different namespace than the one handling authentication, and
2. the derived policy does not exist under the namespace.

You can resolve the error by adding the policy to the relevant namespace or deleting the group policy mapping that uses the derived policy.

As an example, consider the following userpass auth method failure. The error is due to the fact that Vault expects a group policy under the namespace that does not exist.

# Failed login
$ vault login -method=userpass username=user1 password=123
Error authenticating: Error making API request.

URL: PUT http://127.0.0.1:8200/v1/auth/userpass/login/user1
Code: 500. Errors:

* internal error

To confirm the problem is a missing policy, start by identifying the relevant entity and group IDs:

$ vault read -format=json identity/entity/name/user1 | \
  jq '{"entity_id": .data.id, "group_ids": .data.group_ids} '
{
  "entity_id": "420c82de-57c3-df2e-2ef6-0690073b1636",
  "group_ids": [
    "6cb152b7-955d-272b-4dcf-a2ed668ca1ea"
  ]
}

Use the group ID to fetch the relevant policies for the group under the ns1 namespace:

$ vault read -format=json -namespace=ns1 \
  identity/group/id/6cb152b7-955d-272b-4dcf-a2ed668ca1ea | \
  jq '.data.policies'
[
  "group_policy"
]

Now that we know Vault is looking for a policy called group_policy, we can check whether that policy exists under the ns1 namespace:

$ vault policy list -namespace=ns1
default

The only policy in the ns1 namespace is default, which confirms that the missing policy (group_policy) is causing the error.

To fix the problem, we can either remove the missing policy from the 6cb152b7-955d-272b-4dcf-a2ed668ca1ea group or create the missing policy under the ns1 namespace.

$ vault write                                             \
  -namespace=ns1                                          \
  identity/group/id/6cb152b7-955d-272b-4dcf-a2ed668ca1ea  \
  name="test"                                             \
  policies="default"

$ vault policy write -namespace=ns1 group_policy - << EOF
    path "secret/data/*" {
        capabilities = ["create", "update"]
    }
EOF

Verify the fix by re-running the login command:

$ vault login -method=userpass username=user1 password=123

Vault is storing references to ephemeral sub-loggers leading to unbounded memory consumption

Affected versions

This memory consumption bug affects Vault Community and Enterprise versions:

• 1.13.7 - 1.13.9
• 1.14.3 - 1.14.5
• 1.15.0 - 1.15.1

This change that introduced this bug has been reverted as of 1.13.10, 1.14.6, and 1.15.2

Issue

Vault is unexpectedly storing references to ephemeral sub-loggers which prevents them from being cleaned up, leading to unbound memory consumption for loggers. This came about from a change to address a previously known issue around sub-logger levels not being adjusted on reload. This impacts many areas of Vault, but primarily logins in Enterprise.

Workaround

There is no workaround.

Sublogger levels not adjusted on reload

Affected versions

This issue affects all Vault Community and Vault Enterprise versions.

Issue

Vault does not honor a modified log_level configuration for certain subsystem loggers on SIGHUP.

The issue is known to specifically affect resolver.watcher and replication.index.* subloggers.

After modifying the log_level and issuing a reload (SIGHUP), some loggers are updated to reflect the new configuration, while some subsystem logger levels remain unchanged.

For example, after starting a server with log_level: "trace" and modifying it to log_level: "info" the following lines appear after reload:

[TRACE] resolver.watcher: dr mode doesn't have failover support, returning
...
[DEBUG] replication.index.perf: saved checkpoint: num_dirty=5
[DEBUG] replication.index.local: saved checkpoint: num_dirty=0
[DEBUG] replication.index.periodic: starting WAL GC: from=2531280 to=2531280 last=2531536

Workaround

The workaround is to restart the Vault server.

URL change for KV v2 secrets engine

Affected versions

1.15.0+

Issue

Recent improvements to the Vault UI updated the URL structure of the KV v2 secrets engine that affect existing URLs.

Previously, URLs for KV v2 used the pattern: ui/vault/secrets/hma/show/${secretPath}. With the recent refactor, KV v2 URLs now use the following pattern: ui/vault/secrets/hma/kv/${encodedUriComponent(secretPath)}/details.

Opening older URLs now result in 404 errors.

Workaround

Currently, no workaround exists.

Improvements that include automatic redirects for older URLs are planned for 1.15.4.

Fatal error during expiration metrics gathering causing Vault crash

Affected versions

This issue affects Vault Community and Enterprise versions:

• 1.13.9
• 1.14.5
• 1.15.1

A fix has been issued in Vault 1.13.10, 1.14.6, and 1.15.2.

Issue

A recent change to Vault to improve state change speed (e.g. becoming active or standby) introduced a concurrency issue which can lead to a concurrent iteration and write on a map, causing a fatal error and crashing Vault. This error occurs when gathering lease and token metrics from the expiration manager. These metrics originate from the active node in a HA cluster, as such a standby node will take over active duties and the cluster will remain functional should the original active node encounter this bug. The new active node will be vulnerable to the same bug, but may not encounter it immediately.

There is no workaround.

Audit devices could log raw data despite configuration

Affected versions

• 1.15.0 - 1.15.4

Issue

Enabling an audit device which specifies the log_raw option could lead to raw data being logged to other audit devices, regardless of whether they are configured to use log_raw.

The issue with raw data potentially appearing in logs where HMAC data as expected, is fixed as a patch release in Vault 1.15.5.

Workaround

Do not enable any audit devices in Vault that use log_raw. If any audit devices are currently enabled with log_raw set to true they should be disabled.

To view the options for audit devices via the CLI, use the --detailed flag for the vault audit list command:

$ vault audit list --detailed

The output will resemble the following, with log_raw shown under Options on any device which has it enabled:

Example output:

Path      Type    Description    Replication    Options
----      ----    -----------    -----------    -------
file1/    file    n/a            replicated     file_path=/var/log/vault/log1.json
file2/    file    n/a            replicated     file_path=/var/log/vault/log2.json log_raw=true

Disable any device with the log_raw option set to true using the command vault audit disable {path} (file2 in the above output):

$ vault audit disable file2

See also: Disable audit via API.

Deadlock can occur on performance secondary clusters with many mounts

Affected versions

• 1.15.0 - 1.15.5
• 1.14.5 - 1.14.9
• 1.13.9 - 1.13.13

Issue

Vault 1.15.0, 1.14.5, and 1.13.9 introduced a worker pool to schedule periodic rollback operations on all mounts. This worker pool defaulted to using 256 workers. The worker pool introduced a risk of deadlocking on the active node of performance secondary clusters, leaving that cluster unable to service any requests.

The conditions required to cause the deadlock on the performance secondary:

• Performance replication is enabled
• The performance primary cluster has more than 256 non-local mounts. The more mounts the cluster has, the more likely the deadlock becomes
• One of the following occurs:
  • A replicated mount is unmounted or remounted OR
  • A replicated namespace is deleted OR
  • Replication paths filters are used to filter at least one mount or namespace

Workaround

Set the VAULT_ROLLBACK_WORKERS environment variable to a number larger than the number of mounts in your Vault cluster and restart Vault:

$ export VAULT_ROLLBACK_WORKERS=1000

Audit fails to recover from panics when formatting audit entries

Affected versions

• 1.15.0 - 1.15.5

Issue

Due to an issue in the new event framework, Vault tries to resolve panics that occur when formatting audit entries. Vault cannot resolve the panic correctly, which results in the server terminating unexpectedly.

The panic issue was resolved in 1.15.6.

Workaround

Set the VAULT_AUDIT_DISABLE_EVENTLOGGER environment variable to true to disable the new underlying event framework and restart Vault:

$ export VAULT_AUDIT_DISABLE_EVENTLOGGER=true

On startup, Vault reverts to the audit behavior used in 1.14.x.

PKI OCSP GET requests can return HTTP redirect responses

If a base64 encoded OCSP request contains consecutive '/' characters, the GET request will return a 301 permanent redirect response. If the redirection is followed, the request will not decode as it will not be a properly base64 encoded request.

As a workaround, OCSP POST requests can be used which are unaffected.

Impacted versions

Affects all current versions of 1.12.x, 1.13.x, 1.14.x, 1.15.x, 1.16.x

Vault Enterprise Performance Standby nodes audit all request headers

Affected versions

• 1.15.0 - 1.15.7

Issue

Due to an issue in the new event framework, Performance Standby nodes in a Vault Enterprise cluster do not correctly receive configuration regarding which request headers should be written to the audit log.

Rather than no headers appearing in the audit logs by default, Vault Enterprise logs all headers on Performance Standby nodes.

The header issue was resolved in 1.15.8.

Workaround

Set the VAULT_AUDIT_DISABLE_EVENTLOGGER environment variable to true to disable the new underlying event framework and restart Vault:

$ export VAULT_AUDIT_DISABLE_EVENTLOGGER=true

On startup, Vault reverts to the audit behavior used in 1.14.x.