RSA signature validation vulnerability on maleable encoded message in jsrsasign

Description

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.

Recommendation

Update the jsrsasign package to the latest compatible version. Followings are version details:

• Affected version(s): < 10.2.0
• Patched version(s): 10.2.0

References

• GHSA-27fj-mc8w-j9wg
• kjur.github.io
• CVE-2021-30246
• CWE-347
• CAPEC-310
• OWASP 2021-A2
• OWASP 2021-A6

Related Issues

• RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign - CVE-2020-14968
• JWS and JWT signature validation vulnerability with special characters - CVE-2022-25898
• ECDSA signature validation vulnerability by accepting wrong ASN.1 encoding in jsrsasign - CVE-2020-14966
• RSA PKCS#1 decryption vulnerability with prepending zeros in jsrsasign - CVE-2020-14967

Tags:

npm

jsrsasign