TVT TD-2308SS-B DVR contains a directory traversal vulnerability

Overview

TVT TD-2308SS-B DVR and possibly other models contain a directory traversal vulnerability (CWE-22).

Description

CWE-22: Improper Limitation of a Pathname to a Restricted Directory (‘Path Traversal’)

TVT TD-2308SS-B DVR and possibly other models running firmware version 3.2.0.P-3520A-00 contain a directory traversal vulnerability. An attacker can use directory traversal to download critical files such as the config.dat file for the device which contains the credentials for the web interface. For example:
http://[IP ADDRESS]/../../../mnt/mtd/config/config.dat

This file can be parsed with the strings command to reveal the administrative user’s plaintext credentials.

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Impact

A remote unauthenticated attacker can download the configuration file of the device and use the obtained administrator credentials to access the web interface. The attacker may then modify the settings of the device and have access to the connected cameras.

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Solution

We are currently unaware of a practical solution to this problem. Please consider the following workaround.

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Restrict access to the TVT DVR interface

Restrict access to the TVT DVR web interface to trusted networks. If possible, configure management and transit networks for separate VLANs, or restrict access to the device using IP access lists.

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Vendor Information

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Shenzhen TVT Digital Technology Co Ltd Affected

Notified: September 10, 2013 Updated: September 20, 2013

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	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N
Temporal	3.5	E:POC/RL:W/RC:UR
Environmental	1	CDP:L/TD:L/CR:ND/IR:ND/AR:ND

References

• <http://cwe.mitre.org/data/definitions/22.html&gt;
• <http://en.tvt.net.cn/product.aspx?TypeId=1&gt;
• <http://alguienenlafisi.blogspot.com/2013/10/dvr-tvt-directory-traversal.html&gt;

Acknowledgements

Thanks to Cesar Neira for reporting this vulnerability.

This document was written by Adam Rauf.

Other Information

CVE IDs:	CVE-2013-6023
Date Public:	2013-10-25 Date First Published: