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mofh Vulnerable to Improper Restriction of XML External Entity ReferenceGHSA-7r9x-qrpr-3cxw

Fix: Wallvon/mofh@da0d33c

GHSA-7r9x-qrpr-3cxw is a security vulnerability in mofh. A fix is available for mofh — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Dec 3, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🐍mofh

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

The xml.etree.ElementTree module that mofh used up until version 1.0.1 implements a simple and efficient API for parsing and creating XML data. But it makes the application vulnerable to:

  • Billion Laughs attack: It is a type of denial-of-service attack aimed at XML parsers. It uses multiple levels of nested entities. If one large entity is repeated with a couple of thousand chars repeatedly, the parser gets overwhelmed.
  • Quadratic blowup attack: It is similar to a Billion Laughs attack. It abuses entity expansion, too. Instead of nested entities, it repeats one large entity with a couple of thousand chars repeatedly.

The Problem has been patched starting from version 1.0.1 by utilising the defusedxml package instead of xml.etree.ElementTree.

Workarounds

For this vulnerability to be exploited the user must be using a custom API URL, which has to be manually given using the api_url argument, or MyOwnFreeHost's API must be hacked. So, if the user did not use a custom API URL they should be fine, however, upgrading is still advised.

Another workaround could be to call defusedxml.defuse_stdlib() before making any requests using the client.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPImofhall versions1.0.1pip install --upgrade 'mofh==1.0.1'

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mofh, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update mofh to 1.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7r9x-qrpr-3cxw is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

The `xml.etree.ElementTree` module that mofh used up until version `1.0.1` implements a simple and efficient API for parsing and creating XML data. But it makes the application vulnerable to: - [Billion Laughs attack](https://en.wikipedia.org/wiki/Billion_laughs_attack): It is a type of denial-of-service attack aimed at XML parsers. It uses multiple levels of nested entities. If one large entity is repeated with a couple of thousand chars repeatedly, the parser gets overwhelmed. - [Quadratic blowup attack](https://www.acunetix.com/vulnerabilities/web/xml-quadratic-blowup-denial-of-service-a
O3 Security · Impact-Aware SCA

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