Buffer overflow in OpenSC - CVE-2019-19481

Vulnerability identifier: #VU23847

CSH Severity: Low

CVSS v4: 7 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-19481

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error when processing CAC certificates in libopensc/card-cac1.c. A local user can pass specially crafted certificate to the application, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

OpenSC
Arch Linux
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
Fedora
opensc (Alpine package)
opensc
opensc-debuginfo
opensc-debugsource
opensc (Red Hat package)

Install updates from vendor's website.

OpenSC - update to 0.20.0
opensc (Alpine package) - update to 0.20.0-r0
opensc - update to 0.18.0-150000.3.23.1
opensc-debuginfo - update to 0.18.0-150000.3.23.1
opensc-debugsource - update to 0.18.0-150000.3.23.1
opensc (Red Hat package) - update to 0.20.0-2.el8
opensc - update to 0.20.0-3.fc31

• http://www.openwall.com/lists/oss-security/2019/12/29/1
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18618
• https://github.com/OpenSC/OpenSC/commit/b75c002cfb1fd61cd20ec938ff4937d7b1a94278
• https://github.com/OpenSC/OpenSC/releases/tag/0.20.0

• Multiple vulnerabilities in OpenSC
• Arch Linux update for opensc
• Buffer overflow in opensc (Alpine package)
• Red Hat Enterprise Linux 8 update for opensc
• SUSE update for opensc
• Fedora 31 update for opensc