idn2: GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-lab...
CVE-2019-12290 is fixed in 2 products on 1 platform, first by idn2 2.0.4-1.1ubuntu0.2, released October 22, 2019. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| idn2 · Ubuntu 18.04.6 LTS (bionic) | 2.0.4-1.1ubuntu0.2 | idn2 2.0.4-1.1ubuntu0.2 | Oct 22, 2019 |
| libidn2-0 · Ubuntu 18.04.6 LTS (bionic) | 2.0.4-1.1ubuntu0.2 | libidn2-0 2.0.4-1.1ubuntu0.2 | Oct 22, 2019 |
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