#VU87279 Observable discrepancy in Opencryptoki - CVE-2024-0914

Vulnerability identifier: #VU87279

Vulnerability risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-0914

CWE-ID: CWE-203

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Opencryptoki
Universal components / Libraries / Libraries used by multiple products

Vendor: Opencryptoki Project

Description

The vulnerability allows a remote attacker to perform a timing side-channel attack.

The vulnerability exists due to observable discrepancy when processing RSA PKCS#1 v1.5 padded ciphertexts. A remote attacker can perform unauthorized RSA ciphertext decryption or signing, even without access to the corresponding private key.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Opencryptoki: 3.0 - 3.22.0

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2260407
https://github.com/opencryptoki/opencryptoki/commit/2ea019ee2b09f15724d808382d53baca03403288
https://github.com/opencryptoki/opencryptoki/commit/7ffc0e135b4d923d686be536aa7bf69405a360a1
https://github.com/opencryptoki/opencryptoki/commit/c26e049bf40d656bc51429bad190b82fbf63f0c7
https://github.com/opencryptoki/opencryptoki/issues/731
https://github.com/opencryptoki/opencryptoki/pull/737

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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.