GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated.

Severity: Unknown
More Information:

Namespace: debian:10
Feature: libidn2
Feature Version: 2.0.5-1+deb10u1
Fixed By Version:
Ignore by gdivis@inedo.local on 9/16/2020 9:48:13 AM
12/15/2020 8:48:13 AM (90 days from assessment)