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Vulnerability of OpenSC: buffer overflow via tcos_decipher

Synthesis of the vulnerability 

An attacker can trigger a buffer overflow via tcos_decipher() of OpenSC, in order to trigger a denial of service, and possibly to run code.
Vulnerable systems: Fedora, SUSE Linux Enterprise Desktop, SLES.
Severity of this threat: 2/4.
Creation date: 14/12/2020.
Références of this weakness: CVE-2020-26572, FEDORA-2020-7c80831ffe, SUSE-SU-2021:0998-1, VIGILANCE-VUL-34100.

Description of the vulnerability 

An attacker can trigger a buffer overflow via tcos_decipher() of OpenSC, in order to trigger a denial of service, and possibly to run code.
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This vulnerability alert impacts software or systems such as Fedora, SUSE Linux Enterprise Desktop, SLES.

Our Vigil@nce team determined that the severity of this computer weakness alert 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 computer vulnerability.

Solutions for this threat 

Fedora 33: new opensc packages.
New packages are available:
  Fedora 33: opensc 0.21.0-1.fc33

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