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.
History

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cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2019-10-22T15:14:06

Updated: 2024-08-04T23:17:39.504Z

Reserved: 2019-05-22T00:00:00

Link: CVE-2019-12290

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2019-10-22T16:15:10.877

Modified: 2024-11-21T04:22:33.913

Link: CVE-2019-12290

cve-icon Redhat

No data.