CVE-2020-24356 – github.com/cloudflare/cloudflared

Package

Manager: go
Name: github.com/cloudflare/cloudflared
Vulnerable Version: >=0 <0.0.0-20200820025921-9323844ea773

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00033 pctl0.0793

Details

Local Privilege Escalation in cloudflared In `cloudflared` versions < 2020.8.1 (corresponding to 0.0.0-20200820025921-9323844ea773 on pkg.go.dev) on Windows, if an administrator has started `cloudflared` and set it to read configuration files from a certain directory, an unprivileged user can exploit a misconfiguration in order to escalate privileges and execute system-level commands. The misconfiguration was due to the way that `cloudflared` reads its configuration file. One of the locations that `cloudflared` reads from (C:\etc\) is not a secure by default directory due to the fact that Windows does not enforce access controls on this directory without further controls applied. A malformed config.yaml file can be written by any user. Upon reading this config, `cloudflared` would output an error message to a log file defined in the malformed config. The user-controlled log file location could be set to a specific location that Windows will execute when any user logs in.

Metadata

Created: 2021-05-24T16:56:35Z
Modified: 2023-03-02T21:10:45Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/05/GHSA-hgwp-4vp4-qmm2/GHSA-hgwp-4vp4-qmm2.json
CWE IDs: ["CWE-427"]
Alternative ID: GHSA-hgwp-4vp4-qmm2
Finding: F098
Auto approve: 1