CVE-2023-34096

published 2023-06-08

CVE-2023-34096: Thruk is a multibackend monitoring webinterface which currently supports Naemon, Icinga, Shinken and Nagios as backends. In versions 3.06 and prior, the file…

Priority P1 80 high 8.8 CVSS 3.1

AV N AC L PR L UI N S U C H I H A H

EXPLOIT

Thruk is a multibackend monitoring webinterface which currently supports Naemon, Icinga, Shinken and Nagios as backends. In versions 3.06 and prior, the file `panorama.pm` is vulnerable to a Path Traversal vulnerability which allows an attacker to upload a file to any folder which has write permissions on the affected system. The parameter location is not filtered, validated or sanitized and it accepts any kind of characters. For a path traversal attack, the only characters required were the dot (`.`) and the slash (`/`). A fix is available in version 3.06.2.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
sni	thruk	< 3.06.2	3.06.2
thruk	thruk	< 3.06.2	3.06.2

Detection & IOCs extracted from sources · hover to see the quote

url cgi-bin/panorama.cgi↗

url cgi-bin/login.cgi↗

path backgrounds/../../../..{target_folder}↗

cookie thruk_auth↗

• → Alert on the `location` parameter in panorama.cgi requests containing dot-dot-slash sequences (`../`) traversing outside the expected `backgrounds/` directory. ↗
• → Detect login attempts to `cgi-bin/login.cgi` using default credentials (thrukadmin/thrukadmin) followed immediately by a POST to `cgi-bin/panorama.cgi` with a traversal payload. ↗
• → Look for the cookie `thruk_message` set to `fail_message~~login%20failed` as an indicator of brute-force or credential-stuffing attempts against the Thruk login endpoint. ↗
• → Flag multipart POST uploads to panorama.cgi where the uploaded filename is `exploit.jpg` and the file content does not match a valid JPEG magic byte signature. ↗

• · Exploitation requires a valid authenticated session (thruk_auth cookie); the exploit attempts authentication with default credentials first, so disabling or changing default credentials reduces but does not eliminate risk if other valid credentials exist. ↗

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