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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade libidn2 | Aug 22, 2024 | Oct 22, 2019 |
| Amazon Linux Ami 2 | — | Upgrade libidn2-debuginfoUpgrade idn2Upgrade libidn2Upgrade libidn2-devel | Apr 27, 2020 | Oct 22, 2019 |
| Amazon_linux | — | Upgrade libidn2 | Dec 20, 2019 | Oct 22, 2019 |
| Debian | — | Upgrade libidn2 | Jul 30, 2024 | Oct 22, 2019 |
| Freebsd | — | Upgrade libidn2 | Nov 19, 2019 | Nov 18, 2019 |
| Gentoo Linux | — | Upgrade net-dns/libidn2. | Mar 31, 2020 | Oct 22, 2019 |
| Huawei Euleros 2_0_sp8 | — | Upgrade libidn2 | Feb 26, 2020 | Oct 22, 2019 |
| Oracle Solaris | — | Upgrade consolidation/userland/userland-incorporation to version 0.5.11-0.175.3.36.0.27.0 on Solaris 11.3Upgrade library/libidn2 to version 2.0.4-11.4.16.0.1.3.0 on Solaris 11.4 | Dec 18, 2019 | Oct 22, 2019 |
| Suse | — | Upgrade libidn2-develUpgrade libidn2-0-32bitUpgrade libidn2-toolsUpgrade libidn2-langUpgrade libidn2-0 | Dec 5, 2019 | Oct 22, 2019 |
| Ubuntu | — | Upgrade idn2Upgrade libidn2-0 | Oct 30, 2019 | Oct 22, 2019 |
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