CVE-2021-30246 – jsrsasign

Package

Manager: npm
Name: jsrsasign
Vulnerable Version: >=0 <10.2.0

Severity

Level: Critical

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS: 0.002 pctl0.42307

Details

RSA signature validation vulnerability on maleable encoded message in jsrsasign ### Impact Vulnerable jsrsasign will accept RSA signature with improper PKCS#1.5 padding. Decoded RSA signature value consists following form: `01(ff...(8 or more ffs)...ff)00[ASN.1 OF DigestInfo]` Its byte length must be the same as RSA key length, however such checking was not sufficient. To make crafted message for practical attack is very hard. ### Patches Users validating RSA signature should upgrade to 10.2.0 or later. ### Workarounds There is no workaround. Not to use RSA signature validation in jsrsasign. ### ACKNOWLEDGEMENT Thanks to Daniel Yahyazadeh @yahyazadeh for reporting and analyzing this vulnerability.

Metadata

Created: 2021-04-16T19:52:35Z
Modified: 2023-09-11T18:42:06Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/04/GHSA-27fj-mc8w-j9wg/GHSA-27fj-mc8w-j9wg.json
CWE IDs: ["CWE-347"]
Alternative ID: GHSA-27fj-mc8w-j9wg
Finding: F204
Auto approve: 1