CVE-2020-14968 – jsrsasign

Package

Manager: npm
Name: jsrsasign
Vulnerable Version: >=3.0.0 <8.0.17

Severity

Level: Critical

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

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

EPSS: 0.00546 pctl0.66841

Details

RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign ### Impact Jsrsasign can verify RSA-PSS signature which value can expressed as BigInteger. When there is a valid RSA-PSS signature value, this vulnerability is also accept value with prepending zeros as a valid signature. - If you are not use RSA-PSS signature validation, this vulnerability is not affected. - Risk to accept a forged or crafted message to be signed is low. - Risk to raise memory corruption is low since jsrsasign uses BigInteger class. ### Patches Users using RSA-PSS signature validation should upgrade to 8.0.17. ### Workarounds Reject RSA-PSS signatures with unnecessary prepending zeros. ### References https://github.com/kjur/jsrsasign/security/advisories/GHSA-q3gh-5r98-j4h3 [https://github.com/kjur/jsrsasign/issues/438](https://github.com/kjur/jsrsasign/issues/438) https://nvd.nist.gov/vuln/detail/CVE-2020-14968 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14968 https://vuldb.com/?id.157125 https://kjur.github.io/jsrsasign/api/symbols/RSAKey.html#.verifyWithMessageHashPSS

Metadata

Created: 2020-06-26T16:26:50Z
Modified: 2023-01-27T21:41:14Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2020/06/GHSA-q3gh-5r98-j4h3/GHSA-q3gh-5r98-j4h3.json
CWE IDs: ["CWE-119"]
Alternative ID: GHSA-q3gh-5r98-j4h3
Finding: F316
Auto approve: 1