6.5
MEDIUM
CVE-2020-27403
TCL Android Smart TV Insecure Web Server Information Disclosure Vulnerability
Description

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 an attacker on the adjacent network to arbitrarily browse and download sensitive files over an insecure web server running on port 7989 that lists all files & directories. An unprivileged remote attacker on the adjacent network, can download most system files, leading to serious critical information disclosure. Also, some TV models and/or FW versions may expose the webserver with the entire filesystem accessible on another port. For example, nmap scan for all ports run directly from the TV model U43P6046 (Android 8.0) showed port 7983 not mentioned in the original CVE description, but containing the same directory listing of the entire filesystem. This webserver is bound (at least) to localhost interface and accessible freely to all unprivileged installed apps on the Android such as a regular web browser. Any app can therefore read any files of any other apps including Android system settings including sensitive data such as saved passwords, private keys etc.

INFO

Published Date :

Nov. 10, 2020, 6:15 p.m.

Last Modified :

July 21, 2021, 11:39 a.m.

Remotely Exploitable :

No

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2020-27403 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Tcl 32s330_firmware
2 Tcl 40s330_firmware
3 Tcl 43s434_firmware
4 Tcl 50s434_firmware
5 Tcl 55s434_firmware
6 Tcl 65s434_firmware
7 Tcl 75s434_firmware

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-27403 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-27403 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE NVD-CWE-noinfo CWE-200
  • Modified Analysis by [email protected]

    Dec. 08, 2020

    Action Type Old Value New Value
    Changed Reference Type https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf No Types Assigned https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf Third Party Advisory
    Changed Reference Type https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf No Types Assigned https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf Third Party Advisory
    Changed Reference Type https://github.com/sickcodes/security/issues/1 No Types Assigned https://github.com/sickcodes/security/issues/1 Third Party Advisory
    Changed Reference Type https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/ No Types Assigned https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/ Third Party Advisory
    Changed Reference Type https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/ No Types Assigned https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/ Third Party Advisory
    Changed Reference Type https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs No Types Assigned https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs Vendor Advisory
    Changed CPE Configuration AND OR *cpe:2.3:o:tcl:v8-r851t02-lf1_firmware:*:*:*:*:*:*:*:* versions up to (including) 295 OR cpe:2.3:h:tcl:v8-r851t02-lf1:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:tcl:32s330_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t10-lf1v091 OR cpe:2.3:h:tcl:32s330:-:*:*:*:*:*:*:*
    Changed CPE Configuration AND OR *cpe:2.3:o:tcl:v8-t658t01-lf1_firmware:*:*:*:*:*:*:*:* versions up to (including) 373 OR cpe:2.3:h:tcl:v8-t658t01-lf1:-:*:*:*:*:*:*:* AND OR *cpe:2.3:o:tcl:40s330_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t10-lf1v091 OR cpe:2.3:h:tcl:40s330:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:43s434_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t02-lf1v440 OR cpe:2.3:h:tcl:43s434:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:50s434_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t02-lf1v440 OR cpe:2.3:h:tcl:50s434:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:55s434_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t02-lf1v440 OR cpe:2.3:h:tcl:55s434:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:65s434_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t02-lf1v440 OR cpe:2.3:h:tcl:65s434:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:75s434_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v8-r851t02-lf1v440 OR cpe:2.3:h:tcl:75s434:-:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Dec. 07, 2020

    Action Type Old Value New Value
    Added Reference https://securityledger.com/2020/11/tv-maker-tcl-denies-back-door-promises-better-process/ [No Types Assigned]
    Added Reference https://securityledger.com/2020/11/security-holes-opened-back-door-to-tcl-android-smart-tvs/ [No Types Assigned]
    Added Reference https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_Press-Statement-and-Questions_11162020.pdf [No Types Assigned]
    Added Reference https://support.tcl.com/vulnerabilities-found-in-tcl-android-tvs [No Types Assigned]
    Added Reference https://github.com/sickcodes/security/blob/master/etc/CVE-2020-27403_CVE-2020-28055_GlobalFAQ.pdf [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 30, 2020

    Action Type Old Value New Value
    Changed Description 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 an attacker on the adjacent network to arbitrarily browse and download sensitive files over an insecure web server running on port 7989 that lists all files & directories. An unprivileged remote attacker on the adjacent network, can download most system files, leading to serious critical information disclosure. 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 an attacker on the adjacent network to arbitrarily browse and download sensitive files over an insecure web server running on port 7989 that lists all files & directories. An unprivileged remote attacker on the adjacent network, can download most system files, leading to serious critical information disclosure. Also, some TV models and/or FW versions may expose the webserver with the entire filesystem accessible on another port. For example, nmap scan for all ports run directly from the TV model U43P6046 (Android 8.0) showed port 7983 not mentioned in the original CVE description, but containing the same directory listing of the entire filesystem. This webserver is bound (at least) to localhost interface and accessible freely to all unprivileged installed apps on the Android such as a regular web browser. Any app can therefore read any files of any other apps including Android system settings including sensitive data such as saved passwords, private keys etc.
    Added Reference https://github.com/sickcodes/security/issues/1 [No Types Assigned]
  • Initial Analysis by [email protected]

    Nov. 30, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:P/I:N/A:N)
    Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    Changed Reference Type https://github.com/sickcodes No Types Assigned https://github.com/sickcodes Third Party Advisory
    Changed Reference Type https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-009.md No Types Assigned https://github.com/sickcodes/security/blob/master/advisories/SICK-2020-009.md Exploit, Third Party Advisory
    Changed Reference Type https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/ No Types Assigned https://sick.codes/extraordinary-vulnerabilities-discovered-in-tcl-android-tvs-now-worlds-3rd-largest-tv-manufacturer/ Exploit, Third Party Advisory
    Changed Reference Type https://sick.codes/sick-2020-009 No Types Assigned https://sick.codes/sick-2020-009 Exploit, Third Party Advisory
    Added CWE NIST NVD-CWE-noinfo
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:v8-r851t02-lf1_firmware:*:*:*:*:*:*:*:* versions up to (including) 295 OR cpe:2.3:h:tcl:v8-r851t02-lf1:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:tcl:v8-t658t01-lf1_firmware:*:*:*:*:*:*:*:* versions up to (including) 373 OR cpe:2.3:h:tcl:v8-t658t01-lf1:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-27403 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-27403 weaknesses.

CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-59: Session Credential Falsification through Prediction Session Credential Falsification through Prediction CAPEC-60: Reusing Session IDs (aka Session Replay) Reusing Session IDs (aka Session Replay) CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-116: Excavation Excavation CAPEC-169: Footprinting Footprinting CAPEC-224: Fingerprinting Fingerprinting CAPEC-285: ICMP Echo Request Ping ICMP Echo Request Ping CAPEC-287: TCP SYN Scan TCP SYN Scan CAPEC-290: Enumerate Mail Exchange (MX) Records Enumerate Mail Exchange (MX) Records CAPEC-291: DNS Zone Transfers DNS Zone Transfers CAPEC-292: Host Discovery Host Discovery CAPEC-293: Traceroute Route Enumeration Traceroute Route Enumeration CAPEC-294: ICMP Address Mask Request ICMP Address Mask Request CAPEC-295: Timestamp Request Timestamp Request CAPEC-296: ICMP Information Request ICMP Information Request CAPEC-297: TCP ACK Ping TCP ACK Ping CAPEC-298: UDP Ping UDP Ping CAPEC-299: TCP SYN Ping TCP SYN Ping CAPEC-300: Port Scanning Port Scanning CAPEC-301: TCP Connect Scan TCP Connect Scan CAPEC-302: TCP FIN Scan TCP FIN Scan CAPEC-303: TCP Xmas Scan TCP Xmas Scan CAPEC-304: TCP Null Scan TCP Null Scan CAPEC-305: TCP ACK Scan TCP ACK Scan CAPEC-306: TCP Window Scan TCP Window Scan CAPEC-307: TCP RPC Scan TCP RPC Scan CAPEC-308: UDP Scan UDP Scan CAPEC-309: Network Topology Mapping Network Topology Mapping CAPEC-310: Scanning for Vulnerable Software Scanning for Vulnerable Software CAPEC-312: Active OS Fingerprinting Active OS Fingerprinting CAPEC-313: Passive OS Fingerprinting Passive OS Fingerprinting CAPEC-317: IP ID Sequencing Probe IP ID Sequencing Probe CAPEC-318: IP 'ID' Echoed Byte-Order Probe IP 'ID' Echoed Byte-Order Probe CAPEC-319: IP (DF) 'Don't Fragment Bit' Echoing Probe IP (DF) 'Don't Fragment Bit' Echoing Probe CAPEC-320: TCP Timestamp Probe TCP Timestamp Probe CAPEC-321: TCP Sequence Number Probe TCP Sequence Number Probe CAPEC-322: TCP (ISN) Greatest Common Divisor Probe TCP (ISN) Greatest Common Divisor Probe CAPEC-323: TCP (ISN) Counter Rate Probe TCP (ISN) Counter Rate Probe CAPEC-324: TCP (ISN) Sequence Predictability Probe TCP (ISN) Sequence Predictability Probe CAPEC-325: TCP Congestion Control Flag (ECN) Probe TCP Congestion Control Flag (ECN) Probe CAPEC-326: TCP Initial Window Size Probe TCP Initial Window Size Probe CAPEC-327: TCP Options Probe TCP Options Probe CAPEC-328: TCP 'RST' Flag Checksum Probe TCP 'RST' Flag Checksum Probe CAPEC-329: ICMP Error Message Quoting Probe ICMP Error Message Quoting Probe CAPEC-330: ICMP Error Message Echoing Integrity Probe ICMP Error Message Echoing Integrity Probe CAPEC-472: Browser Fingerprinting Browser Fingerprinting CAPEC-497: File Discovery File Discovery CAPEC-508: Shoulder Surfing Shoulder Surfing CAPEC-573: Process Footprinting Process Footprinting CAPEC-574: Services Footprinting Services Footprinting CAPEC-575: Account Footprinting Account Footprinting CAPEC-576: Group Permission Footprinting Group Permission Footprinting CAPEC-577: Owner Footprinting Owner Footprinting CAPEC-616: Establish Rogue Location Establish Rogue Location CAPEC-643: Identify Shared Files/Directories on System Identify Shared Files/Directories on System CAPEC-646: Peripheral Footprinting Peripheral Footprinting CAPEC-651: Eavesdropping Eavesdropping
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.18 }} 0.05%

score

0.53776

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability