#VU66137 Stack-based buffer overflow in OpenSC - CVE-2021-42782

Vulnerability identifier: #VU66137

Vulnerability risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-42782

CWE-ID: CWE-121

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
OpenSC
Universal components / Libraries / Libraries used by multiple products

Vendor: OpenSC

Description

The vulnerability allows an attacker with physical access to perform a denial of service attack.

The vulnerability exists due to a boundary error in Opensc in various places. An attacker with physical access can trigger stack-based buffer overflow and perform a denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSC: 0.2.0 - 0.21.0

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External links
https://github.com/OpenSC/OpenSC/commit/1252aca9
https://github.com/OpenSC/OpenSC/commit/7114fb71
https://github.com/OpenSC/OpenSC/commit/78cdab94
https://github.com/OpenSC/OpenSC/commit/ae1cf0be
https://github.com/OpenSC/OpenSC/commit/456ac566
https://bugzilla.redhat.com/show_bug.cgi?id=2016448

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Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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