#VU75558 Observable response discrepancy in openssl-ibmca

Vulnerability identifier: #VU75558

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: N/A

CWE-ID: CWE-204

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
openssl-ibmca
Universal components / Libraries / Libraries used by multiple products

Vendor: Opencryptoki Project

Description

The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to observable discrepancy in the IBMCA engine. A remote attacker can perform a timing-based side channel attack in RSA.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

openssl-ibmca: 1.2.0 - 2.3.1

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External links
https://www.suse.com/support/update/announcement/2023/suse-su-20232047-1/
https://bugzilla.suse.com/show_bug.cgi?id=1210057
https://bugzilla.suse.com/show_bug.cgi?id=1210058
https://bugzilla.suse.com/show_bug.cgi?id=1210359

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.