PT-2018-13455 · Axtls+1 · Axtls+1

Published 2018-11-07 · Updated 2018-12-13 · CVE-2018-16253

OSV

CVSS v3.1

5.9

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Exploit

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2018-16253

Affected Products

Axtls

Axtls-8266

References · 4

• 🔥 https://sourceforge.net/p/axtls/mailman/message/36459928 · Exploit
• https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c · Patch
• https://osv.dev/vulnerability/CVE-2018-16253 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-16253 · Security Note