#VU64900 Stack-based buffer overflow in Exynos CP Chipset - CVE-2021-25478

Vulnerability identifier: #VU64900

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-25478

CWE-ID: CWE-121

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Exynos CP Chipset
Mobile applications / Mobile firmware & hardware

Vendor: Samsung

Description

The vulnerability allows a local application to escalate privileges on the system.

The vulnerability exists due to a boundary error in LTE RRC Connection Reconfiguration. A local application can trigger a stack-based buffer overflow and execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Exynos CP Chipset: before SMR Oct-2021 Release 1

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External links
https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=10

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.