CVE-2018-16149 Information

Description

In sig_verify() in x509.c in axTLS version 2.1.3 and before the PKCS1 v1.5 signature verification blindly trusts the declared lengths in the ASN.1 structure. Consequently when small public exponents are being used a remote attacker can generate purposefully crafted signatures (and put them on X.509 certificates) to induce illegal memory access and crash the verifier.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://github.com/igrr/axtls-8266/commit/5efe2947ab45e81d84b5f707c51d1c64be52f36c https://sourceforge.net/p/axtls/mailman/message/36459928/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.9