Vulnerability identifier: #VU29222

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-14968

CWE-ID: CWE-347

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jsrsasign
Web applications / Modules and components for CMS

Vendor: Restaumatic

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending "\0" bytes to a signature. A remote attacker can create multiple valid signatures and prepend these bytes with the goal of triggering memory corruption issues.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jsrsasign: 0.0.1 - 8.0.16

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External links
http://github.com/kjur/jsrsasign/issues/438
http://github.com/kjur/jsrsasign/releases/tag/8.0.17
http://github.com/kjur/jsrsasign/releases/tag/8.0.18
http://kjur.github.io/jsrsasign/
http://www.npmjs.com/package/jsrsasign

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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.