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    December 2021
    Product Security Bulletin

    Published 2021-12-01

    The MediaTek Product Security Bulletin contains details of security vulnerabilities affecting MediaTek Smartphone, Tablet, AIoT and Smart display chipsets. Device OEMs have been notified of all the issues and the corresponding security patches for at least two months before publication.

    The severity of the identified vulnerabilities was conducted based on the Common Vulnerability Scoring System version 3.1 (CVSS v3.1).

    The MediaTek Product Security Bulletin contains details of security vulnerabilities affecting MediaTek Smartphone, Tablet, AIoT and Smart display chipsets. Device OEMs have been notified of all the issues and the corresponding security patches for at least two months before publication.

    The severity of the identified vulnerabilities was conducted based on the Common Vulnerability Scoring System version 3.1 (CVSS v3.1).

    Summary

    Severity CVEs
    High CVE-2021-0675,  CVE-2021-0904
    Medium CVE-2021-0676,  CVE-2021-0677,  CVE-2021-0678,  CVE-2021-0679,  CVE-2021-0893,  CVE-2021-0894,  CVE-2021-0895,  CVE-2021-0896,  CVE-2021-0897,  CVE-2021-0898,  CVE-2021-0899,  CVE-2021-0900,  CVE-2021-0901,  CVE-2021-0902,  CVE-2021-0903,  CVE-2021-0673,  CVE-2021-0674

    Details

    CVE CVE-2021-0675
    Title Improper restriction of operations within the bounds of a memory buffer in alac decoder
    Severity High
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In alac decoder, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6570, MT6580, MT6735, MT6737, MT6739, MT6750, MT6750S, MT6753, MT6755, MT6755S, MT6757, MT6757C, MT6757CD, MT6757CH, MT6758, MT6761, MT6763, MT6765, MT6768, MT6771, MT6779, MT6781, MT6785, MT6797, MT6799, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8176, MT8183, MT8185, MT8195, MT8321, MT8362A, MT8365, MT8385, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 8.1, 9.0, 10.0, 11.0
    CVE CVE-2021-0904
    Title Incorrect permission assignment for critical resource in SRAMROM
    Severity High
    Vulnerability Type EoP
    CWE CWE-732 Incorrect Permission Assignment for Critical Resource
    Description In SRAMROM, there is a possible permission bypass due to an insecure permission setting. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6771, MT8183, MT8385, MT8788
    Affected Software Versions Android 8.1, 9.0, 10.0, 11.0
    CVE CVE-2021-0676
    Title Exposure of sensitive information to an unauthorized actor in geniezone driver
    Severity Medium
    Vulnerability Type ID
    CWE CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
    Description In geniezone driver, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6762, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8195, MT8321, MT8362A, MT8365, MT8385, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8771, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 8.1, 9.0, 10.0, 11.0
    CVE CVE-2021-0677
    Title Integer overflow or wraparound in ccu driver
    Severity Medium
    Vulnerability Type ID
    CWE CWE-190 Integer Overflow or Wraparound
    Description In ccu driver, there is a possible out of bounds read due to an integer overflow. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6833, MT6853, MT6873, MT6877, MT6885, MT6889, MT8771, MT8791
    Affected Software Versions Android 11.0
    CVE CVE-2021-0678
    Title Improper restriction of operations within the bounds of a memory buffer in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0679
    Title Improper check or handling of exceptional conditions in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-703 Improper Check or Handling of Exceptional Conditions
    Description In apusys, there is a possible memory corruption due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0893
    Title Use after free in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-416 Use After Free
    Description In apusys, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0894
    Title Improper restriction of operations within the bounds of a memory buffer in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0895
    Title Improper restriction of operations within the bounds of a memory buffer in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0896
    Title Improper restriction of operations within the bounds of a memory buffer in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0897
    Title Time-of-check time-of-use (toctou) race condition in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0898
    Title Use after free in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-416 Use After Free
    Description In apusys, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0899
    Title Use after free in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-416 Use After Free
    Description In apusys, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0900
    Title Improper input validation in apusys
    Severity Medium
    Vulnerability Type ID
    CWE CWE-20 Improper Input Validation
    Description In apusys, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0901
    Title Integer overflow or wraparound in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-190 Integer Overflow or Wraparound
    Description In apusys, there is a possible memory corruption due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0902
    Title Improper input validation in apusys
    Severity Medium
    Vulnerability Type ID
    CWE CWE-20 Improper Input Validation
    Description In apusys, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0903
    Title Improper restriction of operations within the bounds of a memory buffer in apusys
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
    Description In apusys, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8195, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0673
    Title Improper input validation in Audio Aurisys HAL
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-20 Improper Input Validation
    Description In Audio Aurisys HAL, there is a possible permission bypass due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6779, MT6781, MT6785, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8183, MT8185, MT8195, MT8321, MT8385, MT8765, MT8766, MT8768, MT8771, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0
    CVE CVE-2021-0674
    Title Improper input validation in alac decoder
    Severity Medium
    Vulnerability Type ID
    CWE CWE-20 Improper Input Validation
    Description In alac decoder, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6570, MT6580, MT6735, MT6737, MT6739, MT6750, MT6750S, MT6753, MT6755, MT6755S, MT6757, MT6757C, MT6757CD, MT6757CH, MT6758, MT6761, MT6763, MT6765, MT6768, MT6771, MT6779, MT6781, MT6785, MT6797, MT6799, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8176, MT8183, MT8185, MT8195, MT8321, MT8362A, MT8365, MT8385, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 8.1, 9.0, 10.0, 11.0

    Vulnerability Type Definition

    Abbreviation Definition
    RCE Remote Code Execution
    EoP Elevation of Privilege
    ID Information Disclosure
    DoS Denial of Service
    N/A Classification not available

    Versions

    Version Date Description
    1.0 December 1, 2021 Bulletin published.

    Notes

    Information above is generated only at the time of creation of this Security Bulletin. The list of affected chipsets could be not complete. For any further information, device OEMs can reach your MediaTek contact person if needed.

    If you want to report a security vulnerability in MediaTek chipsets or products, please go to Report Security Vulnerability page on MediaTek website.

    Notes

    Information above is generated only at the time of creation of this Security Bulletin. The list of affected chipsets could be not complete. For any further information, device OEMs can reach your MediaTek contact person if needed.

    If you want to report a security vulnerability in MediaTek chipsets or products, please go to Report Security Vulnerability page on MediaTek website.