Vulnerability: Forced Use of PKCS#1 v1.5 Signatures in TLS 1.3

Vulnerability: Forced Use of PKCS#1 v1.5 Signatures in TLS 1.3

CVE-2019-11727 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.

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