CVE-2018-16253

Public Exploit

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.22%
Third-Party Advisory github.com Third-Party Advisory sourceforge.net
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c third party advisory patch
https://sourceforge.net/p/axtls/mailman/message/36459928/ mailing list third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2018-16253?
CVE-2018-16253 has been scored as a medium severity vulnerability.
How to fix CVE-2018-16253?
To fix CVE-2018-16253, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-16253 being actively exploited in the wild?
It is possible that CVE-2018-16253 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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