CVE-2020-3923 : DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contai

DVR firmware in TAT-76 and TAT-77 series of products, provided by TONNET, contain misconfigured authentication mechanism. Attackers can crack the default password and gain access to the system.

Published 2020-02-27 04:15:11

Updated 2021-07-21 11:39:24

Source TWCERT/CC

View at NVD, CVE.org

Vulnerability category: BypassGain privilege

Products affected by CVE-2020-3923

Tonnet » Tat-77104g1 Firmware
Versions up to, including, (<=) tat-77104g1_20190107
cpe:2.3:o:tonnet:tat-77104g1_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-77104g1 » Version: N/A
Tonnet » Tat-70432n Firmware
Versions up to, including, (<=) tat-77208g1_20181225
cpe:2.3:o:tonnet:tat-70432n_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-70432n » Version: N/A
Tonnet » Tat-71416g1 Firmware
Versions up to, including, (<=) tat-71416g1_20181225
cpe:2.3:o:tonnet:tat-71416g1_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-71416g1 » Version: N/A
Tonnet » Tat-71832g1 Firmware
Versions up to, including, (<=) tat-71832g1_20190510
cpe:2.3:o:tonnet:tat-71832g1_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-71832g1 » Version: N/A
Tonnet » Tat-76104g3 Firmware
Versions up to, including, (<=) 20181220_76104g3
cpe:2.3:o:tonnet:tat-76104g3_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-76104g3 » Version: N/A
Tonnet » Tat-76108g3 Firmware
Versions up to, including, (<=) 20181221_76208g3
cpe:2.3:o:tonnet:tat-76108g3_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-76108g3 » Version: N/A
Tonnet » Tat-76116g3 Firmware
Versions up to, including, (<=) 20181221_76216g3
cpe:2.3:o:tonnet:tat-76116g3_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-76116g3 » Version: N/A
Tonnet » Tat-76132g3 Firmware
Versions up to, including, (<=) tat-70832g3_20181221-1
cpe:2.3:o:tonnet:tat-76132g3_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Tonnet » Tat-76132g3 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2020-3923

EPSS FAQ

0.33%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 67 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-3923

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
10.0	HIGH	AV:N/AC:L/Au:N/C:C/I:C/A:C	10.0	10.0	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
8.1	HIGH	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	2.2	5.9	TWCERT/CC
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2020-3923

CWE-287 Improper Authentication

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-3923

https://www.chtsecurity.com/news/4ef5eb3a-fdc3-4d78-8dd7-ec7213e2bbcf

The Vulnerabilities Report of Tonnet DVR｜中華資安國際 CHT Security Co., Ltd.
Third Party Advisory

CVEs referencing this url
https://tvn.twcert.org.tw/taiwanvn/TVN-201910003

台灣漏洞紀錄平台 Taiwan Vulnerability Note
Third Party Advisory

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Vulnerability Details : CVE-2020-3923

Products affected by CVE-2020-3923

Exploit prediction scoring system (EPSS) score for CVE-2020-3923

CVSS scores for CVE-2020-3923

CWE ids for CVE-2020-3923

References for CVE-2020-3923