CVE-2023-42819: Path traversal in Jumpserver

Vulnerability summary

CVE-2023-42819 is a high (CVSS 8.9) vulnerability in fit2cloud jumpserver. EPSS estimates a 2.21% chance of exploitation in the next 30 days, higher than 82.6% of scored vulnerabilities.

Timeline

1. 26-09-2023
   PublishedVulnerability first disclosed.
2. 23-09-2024
   Last modifiedVulnerability information updated.

Description

JumpServer is an open source bastion host. Logged-in users can access and modify the contents of any file on the system. A user can use the 'Job-Template' menu and create a playbook named 'test'. Get the playbook id from the detail page, like 'e0adabef-c38f-492d-bd92-832bacc3df5f'. An attacker can exploit the directory traversal flaw using the provided URL to access and retrieve the contents of the file. `https://jumpserver-ip/api/v1/ops/playbook/e0adabef-c38f-492d-bd92-832bacc3df5f/file/?key=../../../../../../../etc/passwd` a similar method to modify the file content is also present. This issue has been addressed in version 3.6.5. Users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-22Improper Limitation of a Pathname to a Restricted DirectoryThe product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.