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.

References

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