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Fencer Vulns
medium 5.6

CVE-2023-5992 json

Opensc: side-channel leaks while stripping encryption pkcs#1 padding

published 2024-01-31 2 y ago modified 2026-11-05 3 d ago also EUVD-2023-58259

cvss
5.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

A vulnerability was found in OpenSC where PKCS#1 encryption padding removal is not implemented as side-channel resistant. This issue may result in the potential leak of private data.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 8 0:0.20.0-8.el8_9
  • Red Hat Red Hat Enterprise Linux 9 0:0.23.0-4.el9_3
  • opensc Debian 12 0.23.0-0.3+deb12u2
  • opensc Debian 14, Debian 13 0.25.0~rc1-1

debian advisories DEBIAN-CVE-2023-5992

  • opensc Ubuntu Pro 22.04 LTS 0.22.0-1ubuntu2+esm1

ubuntu advisories UBUNTU-CVE-2023-5992

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opensc RHEL 8 0.20.0-8.el8_9
  • opensc RHEL 9 0.23.0-4.el9_3

red hat advisories RHSA-2024:0967RHSA-2024:0966

  • opensc Linux Micro 6.1 0.24.0-slfo.1.1_2.1
  • opensc SLE Module for Basesystem 15 SP7, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 0.22.0-150600.11.6.1
  • opensc Linux Micro 6.0 0.24.0-4.1
  • opensc SLE Micro 5.2, SLE Micro 5.1 0.19.0-150100.3.28.1
  • opensc SLES for SAP 12 SP5, SLES 12 SP5 0.13.0-3.28.1
  • opensc SLE Module for Basesystem 15 SP5, SLE Micro 5.5, SLE Micro 5.4 +4 more 0.22.0-150400.3.9.1

suse advisories SUSE-SU-2025:20671-1SUSE-SU-2025:02754-1SUSE-SU-2025:20530-1SUSE-SU-2024:1773-1SUSE-SU-2024:1625-1SUSE-SU-2024:1402-2

  • opensc AlmaLinux 9 0.23.0-4.el9_3
  • opensc AlmaLinux 8 0.20.0-8.el8_9

almalinux advisories ALSA-2024:0966ALSA-2024:0967

  • opensc Rocky Linux 9 0.23.0-4.el9_3
  • opensc Rocky Linux 8 0.20.0-8.el8_9

rocky linux advisories RLSA-2024:0966RLSA-2024:0967

  • opensc Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 0.25.1-r0

alpine advisories ALPINE-CVE-2023-5992

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • opensc CBL-Mariner 2.0 0.23.0-3
  • opensc Azure Linux 3.0 0.25.1-3

azure linux advisories AZL-34088AZL-35077

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-5992 updated cvss 5.6

OpenSC: Side-channel leaks while stripping encryption PKCS#1 padding

  • Red Hat Enterprise Linux 7 opensc
    affected: no fix available
  • Red Hat Enterprise Linux BaseOS (v. 8) opensc 0.20.0-8.el8_9
    fixed: vendor fix RHSA-2024:0967
  • Red Hat Enterprise Linux BaseOS (v. 9) opensc 0.23.0-4.el9_3
    fixed: vendor fix RHSA-2024:0966

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.16% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • usenix.org https://www.usenix.org/system/files/usenixsecurity24-shagam.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.6 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.