CVE-2018-16253 Security feature bypass in n/a

Medium 5.9 Published 7 Nov 2018 Updated 5 Aug 2024

Remote attackers can forge X.509 certificates due to improper ASN.1 metadata verification in axTLS, enabling impersonation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-16253?

CVE-2018-16253 is a medium-severity vulnerability in n/a, published on 7 Nov 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In sig_verify() in x509.c in axTLS version 2.1.3 and before, the PKCS#1 v1.5 signature verification does not properly verify the ASN.1 metadata. Consequently, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation through fake X.509 certificates. This is an even more permissive variant of CVE-2006-4790 and CVE-2014-1568.

Weakness: CWE-347

Which versions are affected by CVE-2018-16253?

It affects 1 product.

Products include Axtls Project Axtls.

How do I fix CVE-2018-16253?

No fix has been published for CVE-2018-16253 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-16253 being exploited?

There is no known exploitation of CVE-2018-16253 in the wild and no public exploit code.

Sources

Also known as GHSA-g43p-7j43-jpj7.