SSL: OpenSSL X509 Certificate Verification ossl_punycode_decode Stack Buffer Overflow

This signature detects attempts to exploit a known vulnerability against OpenSSL X509 Certificate Verification ossl_punycode_decode. A successful attack can lead to a buffer overflow and arbitrary remote code execution within the context of the OpenSSL.

Extended Description

A buffer overrun can be triggered in X.509 certificate verification, specifically in name constraint checking. Note that this occurs after certificate chain signature verification and requires either a CA to have signed a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer. An attacker can craft a malicious email address in a certificate to overflow an arbitrary number of bytes containing the `.' character (decimal 46) on the stack. This buffer overflow could result in a crash (causing a denial of service). In a TLS client, this can be triggered by connecting to a malicious server. In a TLS server, this can be triggered if the server requests client authentication and a malicious client connects.

Affected Products

Nodejs node.js

References

CVE: CVE-2022-3786

Short Name

SSL:OVERFLOW:OPENSSL-CERT-VERIF

Severity

Major

Recommended

False

Recommended Action

Drop

SSL: OpenSSL X509 Certificate Verification ossl_punycode_decode Stack Buffer Overflow

Extended Description

Affected Products

References

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