CVE-2021-26706 Information

Description

An issue was discovered in lib_mem.c in Micrium uC/OS uC/LIB 1.38.x and 1.39.00. The following memory allocation functions do not check for integer overflow when allocating a pool whose size exceeds the address space: Mem_PoolCreate Mem_DynPoolCreate and Mem_DynPoolCreateHW. Because these functions use multiplication to calculate the pool sizes the operation may cause an integer overflow if the arguments are large enough. The resulting memory pool will be smaller than expected and may be exploited by an attacker.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://micrium.atlassian.net/wiki/spaces/libdoc138/ https://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04 https://docs.silabs.com/micrium/latest/micrium-common/

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8