CVE-2023-4535: Opensc: out-of-bounds read in myeid driver handling encryption using symmetric keys
First published: Wed Sep 27 2023(Updated: )
An out-of-bounds read in MyEID driver handling encryption using symmetric keys. An attacker with physical access to the computer running opensc and 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 in the code handling symmetric keys, which are not widely used for example for desktop login so most of the deployments are not affected. <a href="https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651">https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651</a> <a href="https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories">https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories</a> <a href="https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1">https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/OpenSC | <0.24.0 | 0.24.0 |
| =0.23.0 | ||
| =0.23.0-rc1 | ||
| =0.23.0-rc2 | ||
| =38 | ||
| =39 | ||
| =9.0 |
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Reference Links
- https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651
- https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories
- https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2248101
- https://access.redhat.com/errata/RHSA-2023:7879
- https://bugzilla.redhat.com/show_bug.cgi?id=2240914
- https://access.redhat.com/security/cve/CVE-2023-4535
- https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2
Frequently Asked Questions
What is CVE-2023-4535 vulnerability?
CVE-2023-4535 is an out-of-bounds read vulnerability found in OpenSC packages within the MyEID driver when handling symmetric key encryption.
How does the CVE-2023-4535 vulnerability work?
Exploiting this flaw requires an attacker to have physical access to the computer and a specially crafted USB device or smart card. This flaw allows the attacker to manipulate the data being processed by the MyEID driver.
What is the severity of CVE-2023-4535?
The severity of CVE-2023-4535 is medium, with a CVSS severity score of 4.5.
How can I fix the CVE-2023-4535 vulnerability?
To fix the CVE-2023-4535 vulnerability, update your OpenSC packages to version 0.24.0 or apply the recommended patches provided by the vendor.
Where can I find more information about CVE-2023-4535?
You can find more information about CVE-2023-4535 on the Red Hat Security Advisory and Bugzilla websites.
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