CVE-2019-12290

7.5HIGH

Key Information:

Vendor
Gnu
Status
Libidn2
Vendor
CVE Published:
22 October 2019

Summary

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

https://gitlab.com/libidn/libidn2/merge_requests/71
x_refsource_MISC
https://gitlab.com/libidn/libidn2/commit/241e8f486134793c...
x_refsource_MISC
https://gitlab.com/libidn/libidn2/commit/614117ef6e4c60e1...
x_refsource_CONFIRM

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.