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    CVE-2019-13916

    An issue was discovered in Cypress (formerly Broadcom) WICED Studio 6.2 CYW20735B1 and CYW20819A1. As a Bluetooth Low Energy (BLE) packet is received, it is copied into a Heap (ThreadX Block) buffer. The buffer allocated in dhmulp_getRxBuffer is four bytes too small to hold the maximum of 255 bytes plus headers. It is possible to corrupt a pointer in the linked list holding the free buffers of the g_mm_BLEDeviceToHostPool Block pool. This pointer can be fully controlled by overflowing with 3 bytes of packet data and the first byte of the packet CRC checksum. The checksum can be freely chosen by adapting the packet data accordingly. An attacker might be able to allocate the overwritten address as a receive buffer resulting in a write-what-where condition. This is fixed in BT SDK2.4 and BT SDK2.45.

    Published:Apr 13, 2020
    Last Modified:Nov 21, 2024
    EPS:Apr 13, 2020
    EPSS Score:0.00257
    CVSS Score:8.8

    Affected Products

    Vendor
    Cypress
    Product
    Cyw20735b1
    Vendor
    Cypress
    Product
    Cyw20819a1
    Vendor
    Cypress
    Product
    Wiced Studio

    Exploits

    https://github.com/seemoo-lab/frankenstein/blob/master/doc/CVE_2019_13916.mdhttps://github.com/seemoo-lab/frankenstein/blob/master/doc/CVE_2019_13916.md

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High