Vulnerability Description
Composer is a dependency manager for PHP. URLs for Mercurial repositories in the root composer.json and package source download URLs are not sanitized correctly. Specifically crafted URL values allow code to be executed in the HgDriver if hg/Mercurial is installed on the system. The impact to Composer users directly is limited as the composer.json file is typically under their own control and source download URLs can only be supplied by third party Composer repositories they explicitly trust to download and execute source code from, e.g. Composer plugins. The main impact is to services passing user input to Composer, including Packagist.org and Private Packagist. This allowed users to trigger remote code execution. The vulnerability has been patched on Packagist.org and Private Packagist within 12h of receiving the initial vulnerability report and based on a review of logs, to the best of our knowledge, was not abused by anyone. Other services/tools using VcsRepository/VcsDriver or derivatives may also be vulnerable and should upgrade their composer/composer dependency immediately. Versions 1.10.22 and 2.0.13 include patches for this issue.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Getcomposer | Composer | < 1.10.22 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- https://blog.sonarsource.com/php-supply-chain-attack-on-composer/ExploitThird Party Advisory
- https://getcomposer.org/Vendor Advisory
- https://github.com/composer/composer/security/advisories/GHSA-h5h8-pc6h-jvvxThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2021/dsa-4907Third Party Advisory
- https://blog.sonarsource.com/php-supply-chain-attack-on-composer/ExploitThird Party Advisory
- https://getcomposer.org/Vendor Advisory
- https://github.com/composer/composer/security/advisories/GHSA-h5h8-pc6h-jvvxThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2021/dsa-4907Third Party Advisory
FAQ
What is CVE-2021-29472?
CVE-2021-29472 is a vulnerability with a CVSS score of 8.8 (HIGH). Composer is a dependency manager for PHP. URLs for Mercurial repositories in the root composer.json and package source download URLs are not sanitized correctly. Specifically crafted URL values allow ...
How severe is CVE-2021-29472?
CVE-2021-29472 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-29472?
Check the references section above for vendor advisories and patch information. Affected products include: Getcomposer Composer, Debian Debian Linux, Fedoraproject Fedora.