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8 Vulnerabilities in OpenSSL Could Lead to System Crashes

2 min. read
By Laura Libeer

⚡ TL;DR | Go Straight to the OpenSSL Audit Report

On the 7th of February, the OpenSSL Project released a new update to address several vulnerabilities. One of these is a high-severity type confusion vulnerability that, if successfully exploited, could allow an attacker to read memory contents or enact a denial of service. This could in turn cause the program to behave in unintended ways. In some cases, this could lead to system crashes and code execution.

Update Vulnerable OpenSSL Installations

OpenSSL’s security advisory addresses 8 security issues. You can find a summary below or check out the advisory for full details. Of the 8, only the type confusion vulnerability CVE-2023-0286 is given a high-severity rating. The others all rank as moderate.

Not all of these issues affect every version of OpenSSL, but in general versions 3.0 (up to 3.0.7), 1.1.1, and 1.0.2 are at risk. To protect yourself against these vulnerabilities, you are advised to upgrade any OpenSSL installations to the patched versions 3.0.8, 1.1.1t, and 1.0.2zg.

CVEDescriptionSeverityAffected VersionsPatched versions
CVE-2023-0286type confusion vulnerability relating to X.400 address processingHigh3.0, 1.1.1,, 1.1.1t, 1.0.2zg
CVE-2022-4304Timing Oracle in RSA DecryptionModerate3.0, 1.1.1,, 1.1.1t, 1.0.2zg
CVE-2022-4203X.509 Name Constraints Read Buffer OverflowModerate3.0.0 to
CVE-2023-0215Use-after-free following BIO_new_NDEFModerate3.0, 1.1.1,, 1.1.1t, 1.0.2zg
CVE-2022-4450Double free after calling PEM_read_bio_exModerate3.0,, 1.1.1t
CVE-2023-0216Invalid pointer dereference in d2i_PKCS7 functionsModerate3.0.0 to
CVE-2023-0217NULL dereference validating DSA public keyModerate3.0.0 to
CVE-2023-0401NULL dereference during PKCS7 data verificationModerate3.0.0 to

OpenSSL Vulnerability CVE-2023-0286

CVE-2023-0286 is the only issue that received a high severity rating. It is a type confusion vulnerability relating to X.400 address processing inside an X.509 GeneralName. In most cases, when attacking, a malicious actor will have to provide both the certificate chain and CRL, neither of which need to have a valid signature. If the attacker only controls one, then the other input must already contain an X.400 address as a CRL Distribution point. However, this is uncommon. If the attack succeeds, it could allow an attacker to read memory contents or enact denial-of-service.

Audit your OpenSSL Installations

Our technical team has put together a report, that will give you an overview of all OpenSSL instances in your network, as well as relevant information including version numbers. This way you have an actionable overview of any installations that still need to be upgraded.


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