A closer look at Samsung’s CVE-2023-40353 (8th Sep 2023)

Preface: CWE-125 Out-of-Bounds Read is a type of software error that can occur when reading data from memory. This can happen if the program tries to read beyond the end of an array, for example. Out of bounds reads can lead to crashes or other unexpected vulnerabilities, and may allow an attacker to read sensitive information that they should not have access to. 

Background: The Exynos DSP driver implements two distinct ioctl calls that are used to load images and graphs and boot the device. The DSP_IOC_BOOT ioctl loads the dsp’s firmware images, common libraries, an xml global kernel descriptor file and a linker file for linking libraries. In February 2021 Samsung made some changes in one of its low level drivers : the Digital Signal Processor (DSP) Linux driver. They removed one feature : the ability for untrusted apps to load a custom DSP firmware of their choice.

Vulnerability details: An issue was discovered in Exynos Mobile Processor 980 and 2100. An integer overflow at a buffer index can prevent the execution of requested services via a crafted application.

Official announcement: For details, please refer to the link – https://nvd.nist.gov/vuln/detail/CVE-2023-40353

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