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.

CVSS v3.0 7.8 HIGH
CVSS v2.0 7.2 HIGH

7.8^/10

CVSS v3.0 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.2^/10

CVSS v2.0 : HIGH

V2 Legend

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

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://twitter.com/sickcodes/	Third Party Advisory
https://twitter.com/johnjhacking/	Third Party Advisory
https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/	Exploit Third Party Advisory
https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md	Exploit Third Party Advisory
https://sick.codes/sick-2020-012	Exploit Third Party Advisory
https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/	Third Party Advisory
https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/	Third Party Advisory
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf	Third Party Advisory
https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs	Vendor Advisory
https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf	Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:tcl:32s330_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:32s330:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:tcl:40s330_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:40s330:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND

cpe:2.3:o:tcl:43s434_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:43s434:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND

cpe:2.3:o:tcl:50s434_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:50s434:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND

cpe:2.3:o:tcl:55s434_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:55s434:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND

cpe:2.3:o:tcl:65s434_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:65s434:-:*:*:*:*:*:*:*

Configuration 7 (hide)

AND

cpe:2.3:o:tcl:75s434_firmware:*:*:*:*:*:*:*:*

cpe:2.3:h:tcl:75s434:-:*:*:*:*:*:*:*

Information

Published : 2020-11-10 10:15

Updated : 2020-12-08 10:38

NVD link : CVE-2020-28055

Mitre link : CVE-2020-28055

JSON object : View

CWE

CWE-732

Incorrect Permission Assignment for Critical Resource

Products Affected

tcl

32s330_firmware
32s330
55s434_firmware
75s434
50s434
55s434
65s434
50s434_firmware
75s434_firmware
43s434_firmware
40s330_firmware
40s330
43s434
65s434_firmware

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An attacker, such as a malicious APK or local unprivileged user could perform fake system upgrades by writing to the /data/vendor/upgrage folder."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-732"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2020-28055", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 7.2, "accessVector": "LOCAL", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "authentication": "NONE", "integrityImpact": "COMPLETE", "accessComplexity": "LOW", "availabilityImpact": "COMPLETE", "confidentialityImpact": "COMPLETE"}, "severity": "HIGH", "acInsufInfo": false, "impactScore": 10.0, "obtainAllPrivilege": false, "exploitabilityScore": 3.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}}, "publishedDate": "2020-11-10T18:15Z", "configurations": {"nodes": [{"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:32s330_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t10-lf1v091"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:32s330:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:40s330_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t10-lf1v091"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:40s330:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:43s434_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t02-lf1v440"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:43s434:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:50s434_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t02-lf1v440"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:50s434:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:55s434_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t02-lf1v440"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:55s434:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:65s434_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t02-lf1v440"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:65s434:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}, {"children": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:tcl:75s434_firmware:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndExcluding": "v8-r851t02-lf1v440"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:h:tcl:75s434:-:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": false}]}], "operator": "AND", "cpe_match": []}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2020-12-08T18:38Z"}

7.8 /10