CVE-2019-13916: cypress wiced_studio Out-of-bounds Write

Vulnerability summary

CVE-2019-13916 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in cypress wiced_studio. EPSS estimates a 1.21% chance of exploitation in the next 30 days, higher than 67.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 13-04-2020
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.