#VU77320 Out-of-bounds read in OpenSC - CVE-2023-2977

Vulnerability identifier: #VU77320

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-2977

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

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

Vendor: OpenSC

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition within the cardos_have_verifyrc_package() function in pkcs15 cardos_have_verifyrc_package. A local user can pass a smart card package with malformed ASN1 context to the application, trigger an out-of-bounds read error and read contents of memory on the system.

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/issues/2785
https://access.redhat.com/security/cve/CVE-2023-2977
https://github.com/OpenSC/OpenSC/pull/2787
https://bugzilla.redhat.com/show_bug.cgi?id=2211088

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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.