NVD Vulnerability Detail

CVE-2020-28055

Summary	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.
Publication Date	Nov. 11, 2020, 3:15 a.m.
Registration Date	Jan. 26, 2021, 11:56 a.m.
Last Update	Nov. 21, 2024, 2:22 p.m.

CVSS3.1 : HIGH
スコア	7.8
Vector	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
攻撃元区分(AV)	ローカル
攻撃条件の複雑さ(AC)	低
攻撃に必要な特権レベル(PR)	低
利用者の関与(UI)	不要
影響の想定範囲(S)	変更なし
機密性への影響(C)	高
完全性への影響(I)	高
可用性への影響(A)	高

CVSS2.0 : HIGH
Score	7.2
Vector	AV:L/AC:L/Au:N/C:C/I:C/A:C
攻撃元区分(AV)	ローカル
攻撃条件の複雑さ(AC)	低
攻撃前の認証要否(Au)	不要
機密性への影響(C)	高
完全性への影響(I)	高
可用性への影響(A)	高
Get all privileges.	いいえ
Get user privileges	いいえ
Get other privileges	いいえ
User operation required	いいえ

Affected software configurations

Configuration1		or higher	or less	more than	less than
cpe:2.3:o:tcl:32s330_firmware::::::::					v8-r851t10-lf1v091
execution environment
1	cpe:2.3:h:tcl:32s330:-:::::::*

Configuration2		or higher	or less	more than	less than
cpe:2.3:o:tcl:40s330_firmware::::::::					v8-r851t10-lf1v091
execution environment
1	cpe:2.3:h:tcl:40s330:-:::::::*

Configuration3		or higher	or less	more than	less than
cpe:2.3:o:tcl:43s434_firmware::::::::					v8-r851t02-lf1v440
execution environment
1	cpe:2.3:h:tcl:43s434:-:::::::*

Configuration4		or higher	or less	more than	less than
cpe:2.3:o:tcl:50s434_firmware::::::::					v8-r851t02-lf1v440
execution environment
1	cpe:2.3:h:tcl:50s434:-:::::::*

Configuration5		or higher	or less	more than	less than
cpe:2.3:o:tcl:55s434_firmware::::::::					v8-r851t02-lf1v440
execution environment
1	cpe:2.3:h:tcl:55s434:-:::::::*

Configuration6		or higher	or less	more than	less than
cpe:2.3:o:tcl:65s434_firmware::::::::					v8-r851t02-lf1v440
execution environment
1	cpe:2.3:h:tcl:65s434:-:::::::*

Configuration7		or higher	or less	more than	less than
cpe:2.3:o:tcl:75s434_firmware::::::::					v8-r851t02-lf1v440
execution environment
1	cpe:2.3:h:tcl:75s434:-:::::::*

Related information, measures and tools

No	URL	タグ
1	https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md	Exploit Third Party Advisory
2	https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md	Exploit Third Party Advisory
3	https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf	Third Party Advisory
4	https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf	Third Party Advisory
5	https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf	Third Party Advisory
6	https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf	Third Party Advisory
7	https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/	Third Party Advisory
8	https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/	Third Party Advisory
9	https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/	Third Party Advisory
10	https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/	Third Party Advisory
11	https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/	Exploit Third Party Advisory
12	https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/	Exploit Third Party Advisory
13	https://sick.codes/sick-2020-012	Exploit Third Party Advisory
14	https://sick.codes/sick-2020-012	Exploit Third Party Advisory
15	https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs	Vendor Advisory
16	https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs	Vendor Advisory
17	https://twitter.com/johnjhacking/	Third Party Advisory
18	https://twitter.com/johnjhacking/	Third Party Advisory
19	https://twitter.com/sickcodes/	Third Party Advisory
20	https://twitter.com/sickcodes/	Third Party Advisory

Common Vulnerabilities List

No	CWE	Name	URL
1	CWE-732	重要なリソースに対する不適切なパーミッションの割り当て	https://cwe.mitre.org/data/definitions/732.html

JVN Vulnerability Information

複数の TCL Android Smart TV 製品における重要なリソースに対する不適切なパーミッションの割り当てに関する脆弱性

Title	複数の TCL Android Smart TV 製品における重要なリソースに対する不適切なパーミッションの割り当てに関する脆弱性
Summary	複数の TCL Android Smart TV 製品には、重要なリソースに対する不適切なパーミッションの割り当てに関する脆弱性が存在します。
Possible impacts	情報を取得される、情報を改ざんされる、およびサービス運用妨害 (DoS) 状態にされる可能性があります。
Solution	ベンダ情報および参考情報を参照して適切な対策を実施してください。
Publication Date	Nov. 10, 2020, midnight
Registration Date	July 21, 2021, 5:45 p.m.
Last Update	July 21, 2021, 5:45 p.m.

CVE (情報セキュリティ共通脆弱性識別子)

No	Name	URL
Common Vulnerabilities and Exposures (CVE)
1	CVE-2020-28055	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28055
National Vulnerability Database (NVD)
2	CVE-2020-28055	https://nvd.nist.gov/vuln/detail/CVE-2020-28055\

CWE (共通脆弱性タイプ一覧)

No	Name	URL
JVNDB
1	CWE-732	https://cwe.mitre.org/data/definitions/732.html

ベンダー情報

No	Name	URL
TCL
1	Alert: Vulnerabilities found in TCL Android TVs	https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs

その他

No	Name	URL
関連文書
1	SICK-2020-012 (TCL Android Smart TV (All) - Incorrect Permission Assignment for Critical Vendor Resources - TCL Android TV Vendor Configuration & Upgrade Folders World Writable to Local Attacker)	https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-012.md

Change Log

No	Changed Details	Date of change
1	[2021年07月21日] 掲載	July 21, 2021, 5:45 p.m.