Description:
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: Medium
More Information: https://security-tracker.debian.org/tracker/CVE-2019-12290

Namespace: debian:10
Feature: libidn2
Feature Version: 2.0.5-1+deb10u1
Fixed By Version:
Assessment:
Unassessed by Unknown on

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