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Vulnerability of OpenSC: out-of-bounds memory reading via asn1_decode_entry

Synthesis of the vulnerability 

An attacker can force a read at an invalid address via asn1_decode_entry() of OpenSC, in order to trigger a denial of service, or to obtain sensitive information.
Vulnerable products: Debian, Fedora, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES.
Severity of this weakness: 2/4.
Creation date: 12/09/2019.
Références of this bulletin: CVE-2019-15946, DLA-1916-1, FEDORA-2020-3c93790abe, openSUSE-SU-2021:0565-1, RHSA-2020:4483-01, SUSE-SU-2021:0998-1, SUSE-SU-2021:1168-1, VIGILANCE-VUL-30312.

Description of the vulnerability 

An attacker can force a read at an invalid address via asn1_decode_entry() of OpenSC, in order to trigger a denial of service, or to obtain sensitive information.
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This cybersecurity weakness impacts software or systems such as Debian, Fedora, openSUSE Leap, RHEL, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

Debian 8: new opensc packages.
New packages are available:
  Debian 8: opensc 0.16.0-3+deb8u1

Fedora 31: new opensc packages.
New packages are available:
  Fedora 31: opensc 0.20.0-3.fc31

openSUSE Leap 15.2: new opensc packages.
New packages are available:
  openSUSE Leap 15.2: opensc 0.19.0-lp152.3.3.1

RHEL 8: new opensc packages.
New packages are available:
  RHEL 8.0-8.2: opensc 0.20.0-2.el8

SUSE LE 12 SP5: new opensc packages.
New packages are available:
  SUSE LE 12 SP5: opensc 0.13.0-3.11.1

SUSE LE 15 SP2-3: new opensc packages.
New packages are available:
  SUSE LE 15 SP2: opensc 0.19.0-3.7.1
  SUSE LE 15 SP3: opensc 0.19.0-3.7.1
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