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://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
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | jsrsasign | >= 3.0.0, < 8.0.17 | 8.0.17 |
Referencias
- https://github.com/kjur/jsrsasign/security/advisories/GHSA-q3gh-5r98-j4h3
- https://nvd.nist.gov/vuln/detail/CVE-2020-14968
- https://github.com/kjur/jsrsasign/issues/438
- https://github.com/kjur/jsrsasign/commit/3bcc088c727658d7235854cd2a409a904cc2ce99
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14968
- https://github.com/kjur/jsrsasign
- 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://kjur.github.io/jsrsasign/api/symbols/RSAKey.html#.verifyWithMessageHashPSS
- https://security.netapp.com/advisory/ntap-20200724-0001
- https://vuldb.com/?id.157125
- https://www.npmjs.com/advisories/1541
- https://www.npmjs.com/package/jsrsasign
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Debilidad (CWE)
CWE-119- Plataforma
- npm
- Paquete
jsrsasign- Publicada
- 26.06.2020
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-q3gh-5r98-j4h3 - CC BY 4.0
Historial de vulnerabilidades: jsrsasign
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 14
- Primera → última
- 06.2020 03.2026
- Sin corrección
- 0
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 4
- Alta 7
- Media 2
- Baja 1
Divulgaciones por año
- 2020: 4
- 2021: 1
- 2022: 2
- 2023: 0
- 2024: 1
- 2025: 0
- 2026: 6
-
RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign esta entrada
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