Vulnerability Monitor

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CVE-2020-28055

A vulnerability in the TCL Android Smart TV series V8-R851T02-LF1 V295 and below and V8-T658T01-LF1 V373 and below by TCL Technology Group Corporation allows a local unprivileged attacker, such as a malicious App, to read & write to the /data/vendor/tcl, /data/vendor/upgrade, and /var/TerminalManager directories within the TV file system. An attacker, such as a malicious APK or local unprivileged user could perform fake system upgrades by writing to the /data/vendor/upgrage folder.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.8, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 14 products from tcl, from tcl, from tcl and 11 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-11-10T18:15:12.137

Last Modified

2024-11-21T05:22:17.723

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.8 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

10.0

Weaknesses

Type: Primary
CWE-732

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	tcl	32s330_firmware	< v8-r851t10-lf1v091	Yes
Hardware	tcl	32s330	-	No
Operating System	tcl	40s330_firmware	< v8-r851t10-lf1v091	Yes
Hardware	tcl	40s330	-	No
Operating System	tcl	43s434_firmware	< v8-r851t02-lf1v440	Yes
Hardware	tcl	43s434	-	No
Operating System	tcl	50s434_firmware	< v8-r851t02-lf1v440	Yes
Hardware	tcl	50s434	-	No
Operating System	tcl	55s434_firmware	< v8-r851t02-lf1v440	Yes
Hardware	tcl	55s434	-	No
Operating System	tcl	65s434_firmware	< v8-r851t02-lf1v440	Yes
Hardware	tcl	65s434	-	No
Operating System	tcl	75s434_firmware	< v8-r851t02-lf1v440	Yes
Hardware	tcl	75s434	-	No

References

https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md Exploit, Third Party Advisory ([email protected])
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf Third Party Advisory ([email protected])
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf Third Party Advisory ([email protected])
https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/ Third Party Advisory ([email protected])
https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/ Third Party Advisory ([email protected])
https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/ Exploit, Third Party Advisory ([email protected])
https://sick.codes/sick-2020-012 Exploit, Third Party Advisory ([email protected])
https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs Vendor Advisory ([email protected])
https://twitter.com/johnjhacking/ Third Party Advisory ([email protected])
https://twitter.com/sickcodes/ Third Party Advisory ([email protected])
https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://sick.codes/sick-2020-012 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://twitter.com/johnjhacking/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://twitter.com/sickcodes/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For tcl's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.