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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pymdown-extensions	==9.10 -> ==10.0

GitHub Vulnerability Alerts

CVE-2023-32309

Summary

Arbitrary file read when using include file syntax.

Details

By using the syntax --8<--"/etc/passwd" or --8<--"/proc/self/environ" the content of these files will be rendered in the generated documentation. Additionally, a path relative to a specified, allowed base path can also be used to render the content of a file outside the specified base paths: --8<-- "../../../../etc/passwd".

Within the Snippets extension, there exists a base_path option but the implementation is vulnerable to Directory Traversal. The vulnerable section exists in get_snippet_path(self, path) lines 155 to 174 in snippets.py.

base = "docs"
path = "/etc/passwd"
filename = os.path.join(base,path) # Filename is now /etc/passwd

PoC

import markdown

payload = "--8<-- \"/etc/passwd\""
html = markdown.markdown(payload, extensions=['pymdownx.snippets'])

print(html)

Impact

Any readable file on the host where the plugin is executing may have its content exposed. This can impact any use of Snippets that exposes the use of Snippets to external users.

It is never recommended to use Snippets to process user-facing, dynamic content. It is designed to process known content on the backend under the control of the host, but if someone were to accidentally enable it for user-facing content, undesired information could be exposed.

Suggestion

Specified snippets should be restricted to the configured, specified base paths as a safe default. Allowing relative or absolute paths that escape the specified base paths would need to be behind a feature switch that must be opt-in and would be at the developer's own risk.

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Release Notes

facelessuser/pymdown-extensions (pymdown-extensions)

v10.0

Compare Source

10.0

• Break: Snippets: snippets will restrict snippets to ensure they are under the base_path preventing snippets relative to the base_path but not explicitly under it. restrict_base_path can be set to False for legacy behavior.

v9.11

Compare Source

9.11

• NEW: Emoji: Update to new CDN and use Twemoji 14.1.2.
• NEW: Snippets: Ignore nested snippet section syntax when including a section.

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