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Ubuntu: USN-4168-1 (CVE-2019-12290): Libidn2 vulnerabilities

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Ubuntu: USN-4168-1 (CVE-2019-12290): Libidn2 vulnerabilities

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
10/22/2019
Created
03/05/2020
Added
10/30/2019
Modified
03/22/2023

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.

Solution(s)

  • ubuntu-upgrade-idn2
  • ubuntu-upgrade-libidn2-0

References

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