Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Axtls Project | Axtls | <= 2.1.3 |
Related Weaknesses (CWE)
References
- https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f3PatchThird Party Advisory
- https://sourceforge.net/p/axtls/mailman/message/36459928/ExploitThird Party Advisory
- https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f3PatchThird Party Advisory
- https://sourceforge.net/p/axtls/mailman/message/36459928/ExploitThird Party Advisory
FAQ
What is CVE-2018-16253?
CVE-2018-16253 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 wh...
How severe is CVE-2018-16253?
CVE-2018-16253 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-16253?
Check the references section above for vendor advisories and patch information. Affected products include: Axtls Project Axtls.