Vulnerability identifier: #VU41118

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-19963

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

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

Vendor: wolfSSL

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

An issue was discovered in wolfSSL before 4.3.0 in a non-default configuration where DSA is enabled. DSA signing uses the BEEA algorithm during modular inversion of the nonce, leading to a side-channel attack against the nonce.

Mitigation
Install update from vendor's website.

Vulnerable software versions

wolfSSL: 4.0 - 4.1.0

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External links
http://github.com/wolfSSL/wolfssl/commit/7e391f0fd57f2ef375b1174d752a56ce34b2b190
http://github.com/wolfSSL/wolfssl/releases/tag/v4.3.0-stable

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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.