84 lines
4.1 KiB
Plaintext
84 lines
4.1 KiB
Plaintext
---
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layout: docs
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page_title: Upgrading to Vault 0.6.4 - Guides
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description: |-
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This page contains the list of deprecations and important or breaking changes
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for Vault 0.6.4. Please read it carefully.
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---
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# Overview
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This page contains the list of deprecations and important or breaking changes
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for Vault 0.6.4. Please read it carefully.
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Note: both of these are security sensitive changes.
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## Changes to `default` Policy Addition Rules for `auth/token/create`
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An issue was reported indicating that in some cases, the stated behavior of the
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`default` policy being added to tokens unless specifically requested could lead
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to a privilege escalation scenario if the parent token did not itself have the
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`default` policy. In most cases (e.g. using the default `default` policy) the
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escalated privileges are unlikely to be dangerous, but this behavior is
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undesired.
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As such, we have modified the rules around `default` in a few ways when
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creating tokens using this endpoint:
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1. If a token creation request does not specify desired policies, the parent's
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policies will be used (as normal) but `default` will not be automatically
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added, so the child token will only have `default` if the parent does
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2. If a token creation request specifies desired policies, `default` will be
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added automatically if and only if the parent token has `default`
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3. If the parent token has `sudo` capability on the token creation endpoint,
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`default` is always added; since `sudo` capability on this endpoint allows
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adding any policy, this is not privilege escalation with respect to the
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parent token-holder
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4. When using token store roles, `default` is always added to the list of child
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token policies unless `default` is contained in `disallowed_policies`
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**Regardless of provenance**, if a token being created has the `default` policy
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and `no_default_policy` has been set `true` for the request, the `default`
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policy will be stripped from the final set of policies.
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## Many Users Should Run `auth/token/tidy`
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While investigating a report of accessor entries not being removed correctly
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from Vault's data store, a security issue was discovered: if limited use-count
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tokens are being used and expire due to the use-count dropping to zero (rather
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than due to the token's TTL expiring or the token being explicitly revoked),
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several pieces of Vault's token revocation logic would not be properly run.
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This included cleaning up the associated accessor entry from the data store,
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but more importantly, included the logic used to immediately expire leases
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associated with the token.
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These leases would not live forever; they would still be expired when their TTL
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ran out. This limits the severity of this issue, but it is still a potentially
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serious bug depending on each particular operational scenario.
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To mitigate this issue we have taken the following steps:
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1. Updated the token revocation logic to be more resilient to failures that can
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happen as it performs its various steps; the revocation will now properly
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only be considered successful if no error has occurred. In addition, the
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token entry will remain in the data store (but _not_ be usable for
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performing Vault functions) until all aspects of revocation report success,
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allowing future revocation requests to succeed if the underlying cause of the
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failure has been addressed.
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2. Added a function `auth/token/tidy` that can both clean up the leaked
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accessor entries and expire the leases associated with those accessors'
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tokens.
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In most cases, running `auth/token/tidy` should expire all outstanding
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leases that were generated by these revoked limited-use-count tokens.
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If you are both using limited-use-count tokens _and_ you are using them to
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issue leased secrets, you should consider upgrading to 0.6.4 and running the
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`auth/token/tidy` endpoint immediately. Please note that running this function
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involves a lot of requests to the data store, so plan load accordingly.
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Note: response wrapping tokens do not allow generating leases but have still
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been subject to leaking the accessor entries, so if you have been a heavy user
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of response wrapping you should still consider running the tidy function.
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