#VU66143 Double Free in OpenSC - CVE-2021-42778

Vulnerability identifier: #VU66143

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-2021-42778

CWE-ID: CWE-415

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. An attacker with physical access can pass specially crafted data to the application, trigger double free error, 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://bugzilla.redhat.com/show_bug.cgi?id=2016083
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=28185
https://github.com/OpenSC/OpenSC/commit/f015746d

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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.