#VU23844 Out-of-bounds read in OpenSC - CVE-2019-15946

Vulnerability identifier: #VU23844

Vulnerability risk: Low

CVSSv4.0: 1.8 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-15946

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 when processing ASN.1 Octet string within the asn1_decode_entry() function in libopensc/asn1.c. A local user can supply specially crafted data to the application, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSC: 0.4.0 - 0.19.0

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External links
https://github.com/OpenSC/OpenSC/commit/a3fc7693f3a035a8a7921cffb98432944bb42740
https://github.com/OpenSC/OpenSC/compare/f1691fc...12218d4
https://lists.debian.org/debian-lts-announce/2019/09/msg00009.html
https://github.com/OpenSC/OpenSC/releases/tag/0.20.0

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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.