[enhancement] Add check for reflect.Value in ComposeDecodeHookFunc
#52
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Signed-off-by: Mahad Zaryab <mahadzaryab1@gmail.com>
Signed-off-by: Mahad Zaryab <mahadzaryab1@gmail.com>
Signed-off-by: Mahad Zaryab <mahadzaryab1@gmail.com>
yurishkuro
approved these changes
Nov 17, 2024
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+1, this should address my original use case without introducing a new hook API (which I still thing is a worthy thing to do, e.g. there is a similar issue #21)
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@sagikazarmark Are you able to take a look at this? |
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Thanks @mahadzaryab1! Can you verify that the latest main works for your use cases in OTEL? Also, I wouldn't mind fixing #49 before cutting a new release, I'm just not sure yet what the right fix is, but I suspect simply reverting the error message should work. |
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…RITY] (#622) This PR contains the following updates: | Package | Change | Age | Confidence | |---|---|---|---| | [github.com/go-viper/mapstructure/v2](https://github.com/go-viper/mapstructure) | `v2.2.1` -> `v2.3.0` | [](https://docs.renovatebot.com/merge-confidence/) | [](https://docs.renovatebot.com/merge-confidence/) | --- ### mapstructure May Leak Sensitive Information in Logs When Processing Malformed Data [GHSA-fv92-fjc5-jj9h](GHSA-fv92-fjc5-jj9h) <details> <summary>More information</summary> #### Details ##### Summary Use of this library in a security-critical context may result in leaking sensitive information, if used to process sensitive fields. ##### Details OpenBao (and presumably HashiCorp Vault) have surfaced error messages from `mapstructure` as follows: https://github.com/openbao/openbao/blob/98c3a59c040efca724353ca46ca79bd5cdbab920/sdk/framework/field_data.go#L43-L50 ```go _, _, err := d.getPrimitive(field, schema) if err != nil { return fmt.Errorf("error converting input for field %q: %w", field, err) } ``` where this calls `mapstructure.WeakDecode(...)`: https://github.com/openbao/openbao/blob/98c3a59c040efca724353ca46ca79bd5cdbab920/sdk/framework/field_data.go#L181-L193 ```go func (d *FieldData) getPrimitive(k string, schema *FieldSchema) (interface{}, bool, error) { raw, ok := d.Raw[k] if !ok { return nil, false, nil } switch t := schema.Type; t { case TypeBool: var result bool if err := mapstructure.WeakDecode(raw, &result); err != nil { return nil, false, err } return result, true, nil ``` Notably, `WeakDecode(...)` eventually calls one of the decode helpers, which surfaces the original value: https://github.com/go-viper/mapstructure/blob/1a66224d5e54d8757f63bd66339cf764c3292c21/mapstructure.go#L679-L686 https://github.com/go-viper/mapstructure/blob/1a66224d5e54d8757f63bd66339cf764c3292c21/mapstructure.go#L726-L730 https://github.com/go-viper/mapstructure/blob/1a66224d5e54d8757f63bd66339cf764c3292c21/mapstructure.go#L783-L787 & more. ##### PoC To reproduce with OpenBao: ``` $ podman run -p 8300:8300 openbao/openbao:latest server -dev -dev-root-token-id=root -dev-listen-address=0.0.0.0:8300 ``` and in a new tab: ``` $ BAO_TOKEN=root BAO_ADDR=http://localhost:8300 bao auth enable userpass Success! Enabled userpass auth method at: userpass/ $ curl -X PUT -H "X-Vault-Request: true" -H "X-Vault-Token: root" -d '{"password":{"asdf":"my-sensitive-value"}}' "http://localhost:8300/v1/auth/userpass/users/adsf" {"errors":["error converting input for field \"password\": '' expected type 'string', got unconvertible type 'map[string]interface {}', value: 'map[asdf:my-sensitive-value]'"]} ``` ##### Impact This is an information disclosure bug with little mitigation. See https://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin/74717 for a previous version. That version was fixed, but this is in the second part of that error message (starting at `'' expected a map, got 'string'` -- when the field type is `string` and a `map` is provided, we see the above information leak -- the previous example had a `map` type field with a `string` value provided). This was rated 4.5 Medium by HashiCorp in the past iteration. #### Severity - CVSS Score: 5.3 / 10 (Medium) - Vector String: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N` #### References - [https://github.com/go-viper/mapstructure/security/advisories/GHSA-fv92-fjc5-jj9h](https://github.com/go-viper/mapstructure/security/advisories/GHSA-fv92-fjc5-jj9h) - [https://github.com/go-viper/mapstructure](https://github.com/go-viper/mapstructure) This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-fv92-fjc5-jj9h) and the [GitHub Advisory Database](https://github.com/github/advisory-database) ([CC-BY 4.0](https://github.com/github/advisory-database/blob/main/LICENSE.md)). </details> --- ### Release Notes <details> <summary>go-viper/mapstructure (github.com/go-viper/mapstructure/v2)</summary> ### [`v2.3.0`](https://github.com/go-viper/mapstructure/releases/tag/v2.3.0) [Compare Source](go-viper/mapstructure@v2.2.1...v2.3.0) #### What's Changed - build(deps): bump actions/checkout from 4.1.7 to 4.2.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#46 - build(deps): bump golangci/golangci-lint-action from 6.1.0 to 6.1.1 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#47 - \[enhancement] Add check for `reflect.Value` in `ComposeDecodeHookFunc` by [@​mahadzaryab1](https://github.com/mahadzaryab1) in go-viper/mapstructure#52 - build(deps): bump actions/setup-go from 5.0.2 to 5.1.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#51 - build(deps): bump actions/checkout from 4.2.0 to 4.2.2 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#50 - build(deps): bump actions/setup-go from 5.1.0 to 5.2.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#55 - build(deps): bump actions/setup-go from 5.2.0 to 5.3.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#58 - ci: add Go 1.24 to the test matrix by [@​sagikazarmark](https://github.com/sagikazarmark) in go-viper/mapstructure#74 - build(deps): bump golangci/golangci-lint-action from 6.1.1 to 6.5.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#72 - build(deps): bump golangci/golangci-lint-action from 6.5.0 to 6.5.1 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#76 - build(deps): bump actions/setup-go from 5.3.0 to 5.4.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#78 - feat: add decode hook for netip.Prefix by [@​tklauser](https://github.com/tklauser) in go-viper/mapstructure#85 - Updates by [@​sagikazarmark](https://github.com/sagikazarmark) in go-viper/mapstructure#86 - build(deps): bump github/codeql-action from 2.13.4 to 3.28.15 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#87 - build(deps): bump actions/setup-go from 5.4.0 to 5.5.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#93 - build(deps): bump github/codeql-action from 3.28.15 to 3.28.17 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#92 - build(deps): bump github/codeql-action from 3.28.17 to 3.28.19 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#97 - build(deps): bump ossf/scorecard-action from 2.4.1 to 2.4.2 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#96 - Update README.md by [@​peczenyj](https://github.com/peczenyj) in go-viper/mapstructure#90 - Add omitzero tag. by [@​Crystalix007](https://github.com/Crystalix007) in go-viper/mapstructure#98 - Use error structs instead of duplicated strings by [@​m1k1o](https://github.com/m1k1o) in go-viper/mapstructure#102 - build(deps): bump github/codeql-action from 3.28.19 to 3.29.0 by [@​dependabot](https://github.com/dependabot) in go-viper/mapstructure#101 - feat: add common error interface by [@​sagikazarmark](https://github.com/sagikazarmark) in go-viper/mapstructure#105 - update linter by [@​sagikazarmark](https://github.com/sagikazarmark) in go-viper/mapstructure#106 - Feature allow unset pointer by [@​rostislaved](https://github.com/rostislaved) in go-viper/mapstructure#80 #### New Contributors - [@​tklauser](https://github.com/tklauser) made their first contribution in go-viper/mapstructure#85 - [@​peczenyj](https://github.com/peczenyj) made their first contribution in go-viper/mapstructure#90 - [@​Crystalix007](https://github.com/Crystalix007) made their first contribution in go-viper/mapstructure#98 - [@​rostislaved](https://github.com/rostislaved) made their first contribution in go-viper/mapstructure#80 **Full Changelog**: go-viper/mapstructure@v2.2.1...v2.3.0 </details> --- ### Configuration 📅 **Schedule**: Branch creation - "" (UTC), Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) (UTC). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xLjQiLCJ1cGRhdGVkSW5WZXIiOiI0MS4xLjQiLCJ0YXJnZXRCcmFuY2giOiJtYWluIiwibGFiZWxzIjpbXX0=--> Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/622 Reviewed-by: earl-warren <earl-warren@noreply.code.forgejo.org> Co-authored-by: Renovate Bot <bot@kriese.eu> Co-committed-by: Renovate Bot <bot@kriese.eu>
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This is a follow-up PR to #37. In this PR, we add a check to
ComposeDecodeHookFuncto see if the data obtained from the hook is of typereflect.Value. If it is, then we don't make an additionalreflect.ValueOfcall. This allows us to not drop into the "value" space which is helpful when decoding nil values as they panic when going from reflect.Value to a value via.Interface().