Multiple vulnerabilities in jsrsasign JavaScript library

Published: 2020-06-24

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-14966 CVE-2020-14967
CWE-ID	CWE-347
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	jsrsasign Web applications / Modules and components for CMS
Vendor	Restaumatic

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU29223

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-14966

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 affected software allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and "0" characters appended or prepended to an integer. A remote attacker can cause a security-relevant impact if an application relied on a single canonical signature.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

jsrsasign: 0.0.1 - 8.0.17

CPE2.3

External links

https://github.com/kjur/jsrsasign/issues/437
https://github.com/kjur/jsrsasign/releases/tag/8.0.17
https://github.com/kjur/jsrsasign/releases/tag/8.0.18
https://kjur.github.io/jsrsasign/
https://www.npmjs.com/package/jsrsasign

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.

2) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU29224