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Aerohive HiveManager Classic Privilege Escalation Vulnerability

September 4, 2017 at 5:12 pm - Filed under Hacks - 706 words, reading time ~2 minutes - Permalink - Comments

Sandro "guly" Zaccarini found a critical vulnerability in Aerohive HiveManager Classic 8.1r1. The vulnerability allows a local unprivileged user, normally restricted in a Tenant-environment, to execute code on underlying system.

Aerohive HiveManager Classic Privilege Escalation Vulnerability

 Name              Aerohive HiveManager Classic Privilege Escalation Vulnerability
 Systems Affected  HiveManager Classic 8.0r1 8.1r1
 Severity          Medium 6.6/10
 Impact            CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L/E:H/RC:C
 Vendor            http://www.aerohive.com/
 Advisory          http://www.ush.it/team/ush/hack-aerohive/aerohive-priv-exec.txt
 Authors           Sandro "guly" Zaccarini (guly AT guly DOT org)
 Date              20170901

I. BACKGROUND

Aerohive Networks HiveManager Classic Online NMS is a cloud-enabled
enterprise-class management system for Aerohive networking products.
HiveManager Classic Online offers simple policy creation, firmware
upgrades, and centralized monitoring of thousands of Aerohive access
points, switches, and branch routers.

Responsible disclosure with Aerohive: Aerohive has a very reactive 
security staff.

Their response to our communication was pretty fast, we received the
first ack within 24hrs and an official statement in 4days.

The latest version of the software at the time of writing can be
obtained from support portal at https://support.aerohive.com/login

II. DESCRIPTION

The vulnerability allows a local user, even restricted as a Tenant, to 
upload a backup archive that contain jsp webshell, therefore to execute
code on underlying system.

The affected component is Backup Archive Handler.

III. ANALYSIS

The HiveManager Classic backup is a plain .tar.gz file with a very
simple structure.

Once the archive is extracted, you will see two folders:

- HiveManager
- dbxmlfile

"dbxmlfile/" contains the HM/VHM configuration, an interesting file to
work on. Anyway our interest moved to "HiveManager/" as it contains a
directory named "tomcat/webapps" which is the default Tomcat web app.

The full tree is something like:

── tomcat
    └── webapps
        └── hm
            └── domains
                └── MyTenant
                    └── maps
                        ├── ca.png
                        ├── campus.png
                        ├── map_floorplan.png
                        ├── us.png
                        └── world.png

If such directory is tampered, tar gzipped and then restored using the
backup/restore functionality, an attacker can gain code execution on the
system.

As Proof of Concept a "webshell.jsp" file has been added at maps/ level,
then we created a new .tar.gz archive and tried to restore it.

No error has been thrown and jsp file was available under the docroot at
URI /hm/domains/MyTenant/maps/

Further analysis pointed out that full path was writable so it's 
possible to upload a jsp shell even outside the Tenant scope.

Code will be executed as tomcat (uid/gid 501) allowing a full compromise
of the web UI and access to other Tenant files and configurations as
well.

IV. WORKAROUND

We are not aware of any workaround.

VI. VENDOR RESPONSE

Vendor is moving to a completely new release of the product called
HiveManager-NG, which has a different architecture and is not affected
by this vulnerability. We did not perform any audit on such version of
the product.

VII. CVE INFORMATION

Mitre assigned the CVE-2017-14105 for this vulnerability.

VIII. DISCLOSURE TIMELINE

20170828 Bug discovered
20170829 Vulnerability disclosed to Aerohive
20170829 First reply from Aerohive
20170901 The vendor reply with a wontfix
20170901 Request for CVE to Mitre
20170901 Got CVE-2017-14105 from cve-assign
20170902 Full disclosure

IX. REFERENCES

No references.

X. CREDIT

Sandro "guly" Zaccarini is credited with the discovery of this vulnerability.

Sandro "guly" Zaccarini
web site: http://www.ush.it/
mail: guly AT guly DOT org

XI. LEGAL NOTICES

Copyright (c) 2017 Sandro "guly" Zaccaini

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without mine express
written consent. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please email me for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.
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