Remote code execution in Composer

1) Code Injection

EUVDB-ID: #VU52777

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29472

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to improper input validation of URLs for Mercurial repositories in the root composer.json and package source download URLs. A remote attacker can inject a specially crafted URL that will allow command execution in the HgDriver if hg/Mercurial is installed on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

composer: 1.0.0 - 2.0.12

External links

http://github.com/composer/composer/security/advisories/GHSA-h5h8-pc6h-jvvx

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.