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Debian LTS Advisory DLA-3668-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Guilhem Moulin
November 27, 2023 https://wiki.debian.org/LTS
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Package : opensc
Version : 0.19.0-1+deb10u3
CVE ID : CVE-2023-40660 CVE-2023-40661
Debian Bug : 1055521 1055522
Vulnerabilities were found in opensc, a set of libraries and utilities
to access smart cards, which could lead to application crash or PIN
bypass.
CVE-2023-40660
When the token/card was plugged into the computer and authenticated
from one process, it could be used to provide cryptographic
operations from different process when the empty, zero-length PIN
and the token can track the login status using some of its
internals. This is dangerous for OS logon/screen unlock and small
tokens that are plugged permanently to the computer.
The bypass was removed and explicit logout implemented for most of
the card drivers to prevent leaving unattended logged-in tokens.
CVE-2023-40661
This advisory summarizes automatically reported issues from dynamic
analyzers reports in pkcs15-init that are security relevant.
* stack buffer overflow in sc_pkcs15_get_lastupdate() in pkcs15init;
* heap buffer overflow in setcos_create_key() in pkcs15init;
* heap buffer overflow in cosm_new_file() in pkcs15init;
* stack buffer overflow in cflex_delete_file() in pkcs15init;
* heap buffer overflow in sc_hsm_write_ef() in pkcs15init;
* stack buffer overflow while parsing pkcs15 profile files;
* stack buffer overflow in muscle driver in pkcs15init; and
* stack buffer overflow in cardos driver in pkcs15init.
All of these require physical access to the computer at the time
user or administrator would be enrolling the cards (generating keys
and loading certificates, other card/token management) operations.
The attack requires crafted USB device or smart card that would
present the system with specially crafted responses to the APDUs so
they are considered a high-complexity and low-severity. This issue
is not exploitable just by using a PKCS#11 module as done in most of
the end-user deployments.
For Debian 10 buster, these problems have been fixed in version
0.19.0-1+deb10u3.
We recommend that you upgrade your opensc packages.
For the detailed security status of opensc please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/opensc
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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