Bulletproof TLS Newsletter 
Bulletproof TLS Newsletter is a free periodic newsletter bringing you commentary and news surrounding SSL/TLS and Internet PKI, designed to keep you informed about the latest developments in this space. Received monthly by more than 50,000 subscribers. Maintained by Hanno Böck.
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OpenSSL fixes buffer overflows in certificate parsing
1 Nov 2022
The OpenSSL team has published version 3.0.7 with a fix for two buffer overflow vulnerabilities rated as high. These vulnerabilities affect the parsing of punycode names in certificates.
Both client and server use of OpenSSL can be affected. Clients may parse such certificates if they connect to a malicious server, but the vulnerability is mitigated by the fact that this happens after certificate chain validation. In most settings, this means an attacker would need a malicious CA that signs a malicious certificate. Servers can be affected if they parse client certificates. According to the OpenSSL advisory, this vulnerability may lead to remote code execution, but stack protection mitigations that are available on most modern systems could mitigate attacks. The vulnerabilities have the following IDs: CVE-2022-3602 and CVE-2022-3786.
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