CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
80.5%
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.
github.com/nextcloud/cookbook/blob/a14d6ffc4d45e1447556f68606129dfd6c1505cf/.github/workflows/pull-checks.yml#L67
github.com/nextcloud/cookbook/commit/489bb744
github.com/nextcloud/cookbook/commit/a46d98559e2c64292da9ffb06138cccc2e50ae1b
github.com/nextcloud/cookbook/security/advisories/GHSA-c5pc-mf2f-xq8h
securitylab.github.com/research/github-actions-untrusted-input/
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
80.5%