Improper Verification of Cryptographic Signature in jsrsasign JavaScript library



Published: 2020-06-24
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-14968
CWE-ID CWE-347
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		jsrsasign
Web applications / Modules and components for CMS

Vendor Restaumatic

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU29222

Risk: High

CVSSv3.1:

CVE-ID: CVE-2020-14968

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

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

CPE2.3 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


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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