CVE-2019-12290

Public on 2019-12-13
Modified on 2019-12-19
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
Important
CVSS v3 Base Score
7.5
See breakdown

Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 libidn2 2019-12-13 19:34 ALAS2-2019-1373
Amazon Linux 1 libidn2 2019-12-13 21:13 ALAS-2019-1327

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
Amazon Linux CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD CVSSv2 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
NVD CVSSv3 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N