Mediatek Security Flaws Affecting Smartphones

The July 2023 Product Security Bulletin from Taiwanese chipmaker MediaTek describes security flaws impacting MediaTek chipsets for smartphones, tablets, AIoT, smart displays, smart displays, OTT, and Wi-Fi.

This security advisory provides details on 24 vulnerabilities, of which CVE-2023-20754 and CVE-2023-20755 have been classified as ‘High’ severity.

CSN

Details of the ‘High’ Severity Flaws

  1. CVE-2023-20754 – Integer overflow or wraparound in keyinstall

The vulnerability is tracked as CVE-2023-20754, integer overflow, or wraparound in keyinstall with a ‘high’ severity range. Due to an integer overflow, there may be an out-of-bounds write-in keyinstall.

This can result in the need for system execution privileges and local privilege escalation. Exploitation does not need user involvement.

Affected Chipsets: MT6580, MT6731, MT6735, MT6737, MT6739, MT6753, MT6757, MT6757C, MT6757CD, MT6757CH, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6789, MT6833, MT6835, MT6853, MT6853T, MT6855, MT6873, MT6875, MT6877, MT6879, MT6883, MT6885, MT6886, MT6889, MT6891, MT6893, MT6895, MT6983, MT6985, MT8185, MT8321, MT8385, MT8666, MT8667, MT8765, MT8766, MT8768, MT8781, MT8786, MT8788, MT8789, MT8791, MT8791T, MT8797.

Affected Software Versions: Android 11.0, 12.0, 13.0.

  1. CVE-2023-20755: Improper input validation in keyinstall

The improper input validation in keyinstall vulnerability is tracked as CVE-2023-20755, with a ‘high’ severity range where an integer overflow in keyinstall might result in an out-of-bounds write. 

This could result in a local escalation of privilege with system execution rights needed. Exploitation doesn’t need user involvement.

Affected Chipsets: MT6580, MT6731, MT6735, MT6737, MT6739, MT6753, MT6757, MT6757C, MT6757CD, MT6757CH, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6789, MT6833, MT6835, MT6853, MT6853T, MT6855, MT6873, MT6875, MT6877, MT6879, MT6883, MT6885, MT6886, MT6889, MT6891, MT6893, MT6895, MT6983, MT6985, MT8185, MT8321, MT8385, MT8666, MT8667, MT8765, MT8766, MT8768, MT8781, MT8786, MT8788, MT8789, MT8791, MT8791T, MT8797

Affected Software Versions: Android 11.0, 12.0, 13.0

‘Medium’ Severity Flaws

  1. CVE-2023-20753: Out-of-bounds write
  2. CVE-2023-20756: Integer overflow or wraparound
  3. CVE-2023-20757: Improper input validation in cmdq
  4. CVE-2023-20758: Improper input validation in cmdq
  5. CVE-2023-20759: Improper input validation in cmdq
  6. CVE-2023-20760: Improper input validation in apu
  7. CVE-2023-20761: Improper input validation in ril
  8. CVE-2023-20766: Improper input validation in gps
  9. CVE-2023-20767: Improper input validation in pqframework
  10. CVE-2023-20768: Access of resource using incompatible type (‘type confusion’)
  11. CVE-2023-20771: Concurrent execution using the shared resource with improper synchronization (‘race condition’)
  12. CVE-2023-20772: Improper authentication 
  13. CVE-2023-20773: Improper Authentication
  14. CVE-2023-20774: Improper input validation in display
  15. CVE-2023-20775: Buffer Copy without Checking Size of Input (‘Classic Buffer Overflow’)
  16. CVE-2023-20689: Integer Overflow to Buffer Overflow
  17. CVE-2023-20690: Integer Overflow to Buffer Overflow
  18. CVE-2023-20691: Integer Overflow to Buffer Overflow
  19. CVE-2023-20692: NULL Pointer Dereference
  20. CVE-2023-20693: NULL Pointer Dereference
  21. CVE-2022-32666: User Interface (UI) Misrepresentation of Critical Information
  22. CVE-2023-20748: Improper Input Validation

The company added that device OEMs had been informed of all problems and the accompanying security updates at least two months before publishing.

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