Vulnerability identifier: #VU25770

Vulnerability risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2020-3924

CWE-ID: CWE-77

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TAT-77104G1
Hardware solutions / Other hardware appliances
TAT-70432N
Hardware solutions / Other hardware appliances
TAT-71416G1
Hardware solutions / Other hardware appliances
TAT-71832G1
Hardware solutions / Other hardware appliances
TAT-76104G3
Hardware solutions / Other hardware appliances
TAT-76108G3
Hardware solutions / Other hardware appliances
TAT-76116G3
Hardware solutions / Other hardware appliances
TAT-76132G3
Hardware solutions / Other hardware appliances

Vendor: Tonnet

Description

The vulnerability allows a remote user to execute arbitrary commands on the system.

The vulnerability exists due to the DVR firmware does not properly verify patch files. A remote attacker can inject a specific command into a patch file and gain access to the system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

TAT-77104G1: 20190107

TAT-70432N: 20181225

TAT-71416G1: 20181225

TAT-71832G1: 20190510

TAT-76104G3: 76104G3

TAT-76108G3: 76208G3

TAT-76116G3: 76216G3

TAT-76132G3: 20181221-1

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External links
http://tvn.twcert.org.tw/taiwanvn/TVN-201910004
http://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.