CVEvulnerability

CVE-2019-12290

7.5 HIGH Published 2019-10-22 Modified 2026-10-14 Official page ↗
Status
Modified
Published
2019-10-22
Last modified
2026-10-14
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:P/A:N
Weaknesses
CWE-20

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.

Affected configurations

• gnu libidn2 (< 2.2.0)

Related

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References