CVE-2019-12290

Published: 22 October 2019

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.

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
libidn2 Launchpad, Ubuntu, Debian	bionic	Released (2.0.4-1.1ubuntu0.2)
	disco	Released (2.0.5-1ubuntu0.3)
	eoan	Not vulnerable
	focal	Not vulnerable
	groovy	Not vulnerable
	hirsute	Not vulnerable
	impish	Not vulnerable
	jammy	Not vulnerable
	kinetic	Not vulnerable
	lunar	Not vulnerable
	mantic	Not vulnerable
	noble	Not vulnerable
	trusty	Does not exist
	upstream	Needs triage
	xenial	Does not exist
libidn2-0 Launchpad, Ubuntu, Debian	bionic	Does not exist
	disco	Does not exist
	eoan	Does not exist
	focal	Does not exist
	groovy	Does not exist
	hirsute	Does not exist
	impish	Does not exist
	jammy	Does not exist
	kinetic	Does not exist
	lunar	Does not exist
	mantic	Does not exist
	noble	Does not exist
	trusty	Needed
	upstream	Needs triage
	xenial	Needed

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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