Vulnerability · Published Jun 22, 2020 · Assigned by mitre

CVE-2020-14968

Critical 9.8

In plain English

A critical-severity security flaw in the jsrsasign package (npm). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.9% (higher than 87% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)9.8Critical

Exploit odds (30 days)2.9%top 13.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending '\0' bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	jsrsasign	8.0.17	GHSA-q3gh-5r98-j4h3

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

References

https://kjur.github.io/jsrsasign/ x_refsource_MISC
https://www.npmjs.com/package/jsrsasign x_refsource_MISC
https://github.com/kjur/jsrsasign/releases/tag/8.0.18 x_refsource_MISC
https://github.com/kjur/jsrsasign/releases/tag/8.0.17 x_refsource_MISC
https://github.com/kjur/jsrsasign/issues/438 x_refsource_MISC
https://security.netapp.com/advisory/ntap-20200724-0001/ x_refsource_CONFIRM