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Vulnerability · Published May 26, 2023 · Assigned by GitHub_M

CVE-2023-31128NextCloud Cookbook's pull-checks.yml workflow is vulnerable to OS Command Injection

High 8.1

In plain English

A high-severity OS command injection in cookbook from nextcloud. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 3.3% (higher than 89% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)3.3%top 11.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

NextCloud Cookbook is a recipe library app. Prior to commit a46d9855 on the `master` branch and commit 489bb744 on the `main-0.9.x` branch, the `pull-checks.yml` workflow is vulnerable to command injection attacks because of using an untrusted `github.head_ref` field. The `github.head_ref` value is an attacker-controlled value. Assigning the value to `zzz";echo${IFS}"hello";#` can lead to command injection. Since the permission is not restricted, the attacker has a write-access to the repository. This issue is fixed in commit a46d9855 on the `master` branch and commit 489bb744 on the `main-0.9.x` branch. There is no risk for the user of the app within the NextCloud server. This only affects the main repository and possible forks of it. Those who have forked the NextCloud Cookbook repository should make sure their forks are on the latest version to prevent code injection attacks and similar.

Affected products (as reported)

VendorProductVersions
nextcloud cookbook master < a46d9855main-0.9.x < 489bb744

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

References