Vulnerability identifier: #VU80884

Vulnerability risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-1732

CWE-ID: CWE-755

Exploitation vector: Network

Exploit availability: No

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

Vendor: Cloudflare

Description

The vulnerability allows a remote attacker to modify data on the system.

The vulnerability exists due to when sampling randomness for a shared secret, the implementation of Kyber and FrodoKEM, did not check whether crypto/rand.Read() returns an error. A remote attacker can send specially crafted input and modify data on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

circl: 1.0.0 - 1.3.2

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External links
http://github.com/cloudflare/circl/security/advisories/GHSA-2q89-485c-9j2x

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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.