CVE-2020-26570

2020-10-07T11:07:46
ID RH:CVE-2020-26570
Type redhatcve
Reporter redhat.com
Modified 2021-05-19T06:11:06

Description

The Oberthur smart card software driver in OpenSC before 0.21.0-rc1 has a heap-based buffer overflow in sc_oberthur_read_file.

Mitigation

This flaw can be mitigated in cases where you can use opensc without the Oberthur driver enabled. In such cases, the vulnerable driver can be disabled by specifying them in /etc/opensc.conf card_drivers field in allowlist fashion.
One such example:

app default {  
   card_drivers = cac, cac1, PIV-II;  
}

This would only enable the cac, cac1, and PIV-II smart card drivers, and all others would be disabled, including the Oberthur driver. With the Oberthur driver disabled, this flaw is mitigated. It is important to list all drivers that you need in the card_drivers field so that they are not disabled too.