SerVision HVG Video Gateway web interface contains multiple vulnerabilities

Overview

SerVision HVG Video Gateway web interface contains multiple vulnerabilities affecting multiple firmware versions.

Description

CWE-288: Authentication Bypass Using an Alternate Path or Channel, andCWE-284: Improper Access Control - CVE-2015-0929

By visiting time.htm, a user is issued a cookie that grants administrative privileges in the Servision HVG web interface. There are two distinct impacts of this vulnerability:

1. An unauthenticated user is able to bypass authentication. This is addressed in firmware version 2.2.26a78 and later.
2. An authenticated user is able to elevate privileges. This is reportedly not addressed as of the current release, version 2.2.26a100.

CWE-259: Use of Hard-Coded Password- CVE-2015-0930

SerVision HVG contains a hardcoded password that enables a user to log into the web interface with administrative rights. This is addressed in firmware version 2.2.26a100.

Impact

A remote, unauthenticated user may be able to gain administrative privileges on the device.

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Solution

Apply an upgrade

Users are encouraged to update their firmware to version 2.2.26a100.

Those unable to update should consider the following workaround.

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Restrict access

As a general good security practice, only allow connections from trusted hosts and networks. Appropriate firewall rules which block incoming connections from untrusted networks would likely prevent an external attacker from accessing the device. Note that this does not address the issue of trusted, authenticated users accessing time.htm and gaining elevated privileges.

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Vendor Information

522460

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SerVision Affected

Notified: December 09, 2014 Updated: January 29, 2015

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	10	AV:N/AC:L/Au:N/C:C/I:C/A:C
Temporal	7.9	E:F/RL:OF/RC:UR
Environmental	5.9	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <http://cwe.mitre.org/data/definitions/288.html&gt;
• <http://cwe.mitre.org/data/definitions/284.html&gt;
• <http://cwe.mitre.org/data/definitions/259.html&gt;
• <http://www.servision.net/downloads/&gt;

Acknowledgements

Thanks to Richard Tafoya for reporting this vulnerability.

This document was written by Joel Land.

Other Information

CVE IDs:	CVE-2015-0929, CVE-2015-0930
Date Public:	2015-02-02 Date First Published: