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security: add CT executeTemplate to default function_denylist (#24541)

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This PR adds Consul Template's executeTemplate function to the denylist by
default, in order to prevent accidental or malicious infinitely recursive
execution.

---------

Co-authored-by: Tim Gross <tgross@hashicorp.com>
This commit is contained in:
Piotr Kazmierczak
2024-11-22 19:33:56 +01:00
committed by GitHub
parent 368241dbf2
commit f7a4ded2c0
5 changed files with 20 additions and 9 deletions
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3
.changelog/24541.txt Normal file
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@@ -0,0 +1,3 @@
```release-note:security
security: add executeTemplate to default template function_denylist
```

2
client/config/config.go
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@@ -73,7 +73,7 @@ var (
DefaultTemplateMaxStale = 87600 * time.Hour
DefaultTemplateFunctionDenylist = []string{"plugin", "writeToFile"}
DefaultTemplateFunctionDenylist = []string{"executeTemplate", "plugin", "writeToFile"}
)
// RPCHandler can be provided to the Client if there is a local server

2
command/agent/config_test.go
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@@ -1535,7 +1535,7 @@ func TestConfig_LoadConsulTemplateConfig(t *testing.T) {
agentConfig = defaultConfig.Merge(agentConfig)
templateConfig := agentConfig.Client.TemplateConfig
must.Len(t, 2, templateConfig.FunctionDenylist)
must.Len(t, 3, templateConfig.FunctionDenylist)
})
t.Run("client config with basic template", func(t *testing.T) {

6
website/content/docs/job-specification/template.mdx
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@@ -791,8 +791,10 @@ options](/nomad/docs/configuration/client#options):
- `function_denylist` `([]string: ["plugin"])` - Specifies a list of template
rendering functions that should be disallowed in job specs. By default, the
`plugin` function is disallowed as it allows running arbitrary commands on
the host as root (unless Nomad is configured to run as a non-root user).
`plugin` function is disallowed as it allows running arbitrary commands on the
host as root (unless Nomad is configured to run as a non-root user),
`executeTemplate` is disallowed to prevent accidental or malicious infinitely
recursive execution, and `writeToFile` is disallowed.
- `disable_file_sandbox` `(bool: false)` - Allows templates access to arbitrary
files on the client host via the `file` function. By default, templates can

16
website/content/docs/upgrade/upgrade-specific.mdx
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@@ -15,11 +15,17 @@ used to document those details separately from the standard upgrade flow.
## Nomad 1.9.4
In Nomad 1.9.4, the [default client env deny
list](/nomad/docs/configuration/client#env-denylist) includes additional
environment variables to improve security. Users who need some of these secure
environment variables passed to their tasks should consult the list and
overwrite it in the configuration.
#### Security updates to default deny lists
In Nomad 1.9.4, the default `function_denylist` includes `executeTemplate`, as
a measure to prevent accidental or malicious infinitely recursive execution.
Users that require `executeTemplate` should update their
[configuration](/nomad/docs/job-specification/template#function_denylist).
Additionally, the [default client env deny
list](/nomad/docs/configuration/client#env-denylist) includes more environment
variables. Users who need some of these secure environment variables passed to
their tasks should consult the list and overwrite it in the configuration.
## Nomad 1.9.3