FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports Collection

libidn2 -- roundtrip check vulnerability

Affected packages
libidn2 < 2.2.0


VuXML ID f04f840d-0840-11ea-8d66-75d3253ef913
Discovery 2019-11-14
Entry 2019-11-18
Modified 2020-06-24

CVE list:

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.


CVE Name CVE-2019-12290