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cvelistGitHub_MCVELIST:CVE-2021-21423
HistoryApr 06, 2021 - 6:35 p.m.

CVE-2021-21423 Exposure of Version-Control Repository to an Unauthorized Control Sphere in projen

2021-04-0618:35:14
CWE-527
GitHub_M
www.cve.org
8
cve-2021-21423
projen
unauthorized control
main repository
github workflows
rebuild-bot.yml
pull-request
issue_comment event
github_token
branch protection

CVSS3

6.8

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS

0.002

Percentile

64.9%

projen is a project generation tool that synthesizes project configuration files such as package.json, tsconfig.json, .gitignore, GitHub Workflows, eslint, jest, and more, from a well-typed definition written in JavaScript. Users of projen’s NodeProject project type (including any project type derived from it) include a .github/workflows/rebuild-bot.yml workflow that may allow any GitHub user to trigger execution of un-trusted code in the context of the “main” repository (as opposed to that of a fork). In some situations, such untrusted code may potentially be able to commit to the “main” repository. The rebuild-bot workflow is triggered by comments including @projen rebuild on pull-request to trigger a re-build of the projen project, and updating the pull request with the updated files. This workflow is triggered by an issue_comment event, and thus always executes with a GITHUB_TOKEN belonging to the repository into which the pull-request is made (this is in contrast with workflows triggered by pull_request events, which always execute with a GITHUB_TOKEN belonging to the repository from which the pull-request is made). Repositories that do not have branch protection configured on their default branch (typically main or master) could possibly allow an untrusted user to gain access to secrets configured on the repository (such as NPM tokens, etc). Branch protection prohibits this escalation, as the managed GITHUB_TOKEN would not be able to modify the contents of a protected branch and affected workflows must be defined on the default branch.

CNA Affected

[
  {
    "product": "projen",
    "vendor": "projen",
    "versions": [
      {
        "status": "affected",
        "version": ">= 0.6.0, < 0.16.41"
      }
    ]
  }
]

CVSS3

6.8

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS

0.002

Percentile

64.9%

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