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Improper Input Validation Affecting libidn2 package, versions <2.0.4-1.1ubuntu0.2

medium

Snyk CVSS

    Attack Complexity Low
    Integrity High

    Threat Intelligence

    EPSS 0.35% (72nd percentile)
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NVD
7.5 high
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SUSE
6.5 medium

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  • Snyk ID SNYK-UBUNTU1804-LIBIDN2-474599
  • published 23 Oct 2019
  • disclosed 22 Oct 2019
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Introduced: 22 Oct 2019

CVE-2019-12290 Open this link in a new tab
CWE-20 Open this link in a new tab

How to fix?

Upgrade Ubuntu:18.04 libidn2 to version 2.0.4-1.1ubuntu0.2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libidn2 package and not the libidn2 package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

References