CVE-2023-33960: OpenProject is web-based project management software. For any OpenProject installation, a `robots.txt` file is generated through the server to denote which…

PriorityP354high7.5CVSS 3.1

AVNACLPRNUINSUCHINAN

EXPLOIT

EPSS

1.27%

66.1th percentile

OpenProject is web-based project management software. For any OpenProject installation, a `robots.txt` file is generated through the server to denote which routes shall or shall not be accessed by crawlers. These routes contain project identifiers of all public projects in the instance. Prior to version 12.5.6, even if the entire instance is marked as `Login required` and prevents all truly anonymous access, the `/robots.txt` route remains publicly available. Version 12.5.6 has a fix for this issue. Alternatively, users can download a patchfile to apply the patch to any OpenProject version greater than 10.0 As a workaround, one may mark any public project as non-public and give anyone in need of access to the project a membership.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
openproject	openproject	< 12.5.6	12.5.6
opf	openproject	< 12.5.6	12.5.6

Detection & IOCsextracted from sources · hover to see the quote

path/robots.txt↗

path/projects/

path/work_packages

path/repository

path/activity

→Send an unauthenticated HTTP GET request to /robots.txt; a vulnerable OpenProject instance will return HTTP 200 with a body containing 'Disallow: /projects/' along with paths such as /work_packages, /repository, or /activity, exposing public project identifiers.
→Shodan fingerprinting query for exposed OpenProject instances: http.html:"OpenProject"

·The vulnerability is present in OpenProject versions prior to 12.5.6. The /robots.txt exposure occurs even when the instance is configured with 'Login required', meaning the fix requires upgrading to 12.5.6+ or applying the patch (valid for versions > 10.0). ↗
·As a workaround (without patching), marking all public projects as non-public removes their identifiers from robots.txt, eliminating the exposure without upgrading. ↗

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