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    April 2022
    Product Security Bulletin

    Published 2022-04-06

    The MediaTek Product Security Bulletin contains details of security vulnerabilities affecting MediaTek Smartphone, Tablet, AIoT, Smart display, Smart platform and OTT 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, Smart display, Smart platform and OTT 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-2022-20081, CVE-2021-25477
    Medium CVE-2022-20062, CVE-2022-20063, CVE-2022-20064, CVE-2022-20065, CVE-2022-20066, CVE-2022-20067, CVE-2022-20052, CVE-2022-20068, CVE-2022-20069, CVE-2022-20070, CVE-2022-20071, CVE-2022-20072, CVE-2022-20073, CVE-2022-20074, CVE-2022-20075, CVE-2022-20076, CVE-2022-20077, CVE-2022-20078, CVE-2022-20079, CVE-2022-20080

    Details

    CVE CVE-2022-20081
    Title Insecure default initialization of resource in A-GPS
    Severity High
    Vulnerability Type ID
    CWE CWE-1188 Insecure Default Initialization of Resource
    Description In A-GPS, there is a possible man in the middle attack due to improper certificate validation. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6580, MT6735, MT6737, MT6739, MT6753, MT6761, MT6765, MT6768, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6873, MT6877, MT6879, MT6883, MT6885, MT6889, MT6893, MT6895, MT6983, MT8666, MT8667, MT8675
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2021-25477
    Title Double free in Modem LTE RRC
    Severity High
    Vulnerability Type DoS
    CWE CWE-415 Double Free
    Description In Modem LTE RRC, there is a possible memory corruption due to a double free. This could lead to remote denial of service when decoding an incorrect ASN.1 data with no additional execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6735, MT6737, MT6739, MT6750S, MT6757, MT6757P, MT6761, MT6762, MT6762D, MT6762M, MT6763, MT6765, MT6765T, MT6767, MT6768, MT6769, MT6769T, MT6769Z, MT6771, MT6779, MT6781, MT6783, MT6785, MT6785T, MT6833, MT6853, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8666, MT8667, MT8675, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Modem LR9, LR11, LR12, LR12A, LR13, NR15

    CVE CVE-2022-20062
    Title Use after free in mdp
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-416 Use After Free
    Description In mdp, 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 no needed for exploitation.
    Affected Chipsets MT6765, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6879, MT6885, MT6891, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8675, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20063
    Title Out-of-bounds write in atf (spm)
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-787 Out-of-bounds Write
    Description In atf (spm), 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 needed for exploitation.
    Affected Chipsets MT6765, MT8385, MT8666, MT8667, MT8766, MT8786, MT8788
    Affected Software Versions Android 9.0, 10.0

    CVE CVE-2022-20064
    Title Out-of-bounds read in ccci
    Severity Medium
    Vulnerability Type ID
    CWE CWE-125 Out-of-bounds Read
    Description In ccci, there is a possible leak of kernel pointer 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 MT6580, MT6737, MT6739, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6779, MT6781, MT6785, MT6789, MT6833, MT6853, MT6873, MT6875, MT6877, MT6879, MT6883, MT6885, MT6889, MT6893, MT6895, MT6983, MT6985, MT8321, MT8667, MT8675, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20065
    Title Out-of-bounds read in ccci
    Severity Medium
    Vulnerability Type ID
    CWE CWE-125 Out-of-bounds Read
    Description In ccci, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6580, MT6737, MT6739, MT6761, MT6762, MT6765, MT6768, MT6769, MT6779, MT6781, MT6785, MT6833, MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6983, MT8321, MT8667, MT8675, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20066
    Title Improper handling of exceptional conditions in atf (hwfde)
    Severity Medium
    Vulnerability Type ID
    CWE CWE-755 Improper Handling of Exceptional Conditions
    Description In atf (hwfde), there is a possible leak of sensitive information due to incorrect error handling. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT8168, MT8365, MT8696
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20067
    Title Improper input validation in mdp
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-20 Improper Input Validation
    Description In mdp, 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 no needed for exploitation.
    Affected Chipsets MT6731, MT6735, MT6739, MT6750, MT6755, MT6755S, MT6757, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6885, MT6891, MT6893, MT8167, MT8167S, MT8168, MT8173, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8675, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 9.0, 10.0, 11.0, 12.0

    CVE CVE-2022-20052
    Title Use after free in mdp
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-416 Use After Free
    Description In mdp, 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 needed for exploitation.
    Affected Chipsets MT6580, MT6735, MT6737, MT6739, MT6750, MT6753, MT6755, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6885, MT6890, MT6891, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8786, MT8788
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20068
    Title Unix symbolic link (symlink) following in mobile_log_d
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-61 UNIX Symbolic Link (Symlink) Following
    Description In mobile_log_d, there is a possible symbolic link following due to an improper link resolution. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6731, MT6732, MT6735, MT6737, MT6739, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6795, MT6799, MT6833, MT6853T, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT6985, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8675, MT8735A, MT8735B, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20069
    Title Integer overflow or wraparound in preloader (usb)
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-190 Integer Overflow or Wraparound
    Description In preloader (usb), there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege, for an attacker who has physical access to the device, with no additional execution privileges needed. User interaction is needed for exploitation.
    Affected Chipsets MT6580, MT6735, MT6739, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6799, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6885, MT6893, MT6983, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8675, MT8695, MT8696, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20070
    Title Improper input validation in ssmr
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-20 Improper Input Validation
    Description In ssmr, 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 no needed for exploitation.
    Affected Chipsets MT6731, MT6732, MT6735, MT6737, MT6739, MT6750, MT6750S, MT6752, MT6753, MT6755, MT6755S, MT6757, MT6757C, MT6757CD, MT6757CH, MT6758, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6789, MT6795, MT6797, MT6799, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6879, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT6895, MT6983, MT6985
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20071
    Title Improperly implemented security check for standard in ccu
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-358 Improperly Implemented Security Check for Standard
    Description In ccu, there is a possible escalation of privilege due to a missing certificate validation. This could lead to local escalation of privilege with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6833, MT6853, MT6873, MT6877, MT6885, MT6893, MT8797
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20072
    Title Incorrect comparison in search engine service
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-697 Incorrect Comparison
    Description In search engine service, there is a possible way to change the default search engine due to an incorrect comparison. This could lead to local escalation of privilege with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6580, MT6735, MT6737, MT6739, MT6753, MT6755, MT6755S, MT6761, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6789, MT6795, MT6797, MT6799, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6879, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT6895, MT6983, MT6985, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8675, MT8765, MT8766, MT8768, MT8786, MT8788, MT8791, MT8797
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20073
    Title Integer underflow (wrap or wraparound) in preloader (usb)
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-191 Integer Underflow (Wrap or Wraparound)
    Description In preloader (usb), there is a possible out of bounds write due to a integer underflow. This could lead to local escalation of privilege, for an attacker who has physical access to the device, with no additional execution privileges needed. User interaction is needed for exploitation.
    Affected Chipsets MT2601, MT6580, MT6735, MT6739, MT6761, MT6763, MT6765, MT6768, MT6771, MT6779, MT6781, MT6785, MT6799, MT6833, MT6873, MT6877, MT6885, MT6893, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8183, MT8185, MT8321, MT8362A, MT8365, MT8385, MT8666, MT8667, MT8675, MT8695, MT8696, MT8765, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20074
    Title Out-of-bounds read in preloader (partition)
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-125 Out-of-bounds Read
    Description In preloader (partition), there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege, for an attacker who has physical access to the device, with no additional execution privileges needed. User interaction is needed for exploitation.
    Affected Chipsets MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6779, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6879, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT6895, MT6983, MT6985, MT8185, MT8321, MT8385, MT8667, MT8675, MT8695, MT8766, MT8768, MT8786, MT8788, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20075
    Title Integer overflow or wraparound in ged
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-190 Integer Overflow or Wraparound
    Description In ged, there is a possible out of bounds write due to an integer overflow. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6580, MT6731, MT6735, MT6750S, MT6753, MT6755S, MT6757, MT6757C, MT6757CD, MT6757CH, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8127, MT8135, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8176, MT8183, MT8312C, MT8312D, MT8321, MT8362A, MT8365, MT8382, MT8385, MT8389, MT8392, MT8392_90, MT8665, MT8685, MT8693, MT8735, MT8735B, MT8735M, MT8752, MT8765, MT8783, MT8785, MT8788
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20076
    Title Improper handling of exceptional conditions in ged
    Severity Medium
    Vulnerability Type ID
    CWE CWE-755 Improper Handling of Exceptional Conditions
    Description In ged, there is a possible memory corruption due to an incorrect error handling. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation.
    Affected Chipsets MT6580, MT6731, MT6735, MT6750S, MT6753, MT6755S, MT6757, MT6757C, MT6757CD, MT6757CH, MT6761, MT6762, MT6763, MT6765, MT6768, MT6769, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6875, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8127, MT8135, MT8163, MT8167, MT8167S, MT8168, MT8173, MT8175, MT8176, MT8183, MT8312C, MT8312D, MT8321, MT8362A, MT8365, MT8382, MT8385, MT8389, MT8392, MT8392_90, MT8665, MT8685, MT8693, MT8735, MT8735B, MT8735M, MT8752, MT8765, MT8783, MT8785, MT8788
    Affected Software Versions Android 10.0, 11.0, 12.0

    CVE CVE-2022-20077
    Title Concurrent execution using shared resource with improper synchronization ('race condition') in vow
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
    Description In vow, there is a possible memory corruption due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8185, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0

    CVE CVE-2022-20078
    Title Concurrent execution using shared resource with improper synchronization ('race condition') in vow
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
    Description In vow, there is a possible memory corruption due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6833, MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8791, MT8797
    Affected Software Versions Android 11.0, 12.0

    CVE CVE-2022-20079
    Title Improper input validation in vow
    Severity Medium
    Vulnerability Type ID
    CWE CWE-20 Improper Input Validation
    Description In vow, there is a possible read of uninitialized data due to a improper input validation. This could lead to local information disclosure with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6781, MT6785, MT6833, MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8185, MT8789, MT8791, MT8797
    Affected Software Versions Android 10.0, 11.0

    CVE CVE-2022-20080
    Title Concurrent execution using shared resource with improper synchronization ('race condition') in SUB2AF
    Severity Medium
    Vulnerability Type EoP
    CWE CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
    Description In SUB2AF, there is a possible memory corruption due to a race condition. This could lead to local escalation of privilege with System execution privileges needed. User interaction is no needed for exploitation.
    Affected Chipsets MT6580, MT6735, MT6737, MT6739, MT6753, MT6757, MT6761, MT6763, MT6765, MT6768, MT6771, MT6779, MT6781, MT6785, MT6833, MT6853, MT6873, MT6877, MT6883, MT6885, MT6889, MT6893, MT8168, MT8321, MT8365, MT8666, MT8765, MT8766, MT8768, MT8786, MT8788, MT8791, MT8797
    Affected Software Versions Android 9.0, 10.0, 11.0, 12.0

    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 April 6, 2022 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.