Modified
This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Current Description
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.
Source:
MITRE
View Analysis Description
Analysis Description
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.
Source:
MITRE
Severity
CVSS 3.x Severity and Metrics:
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 Severity and Metrics:
Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:N)
References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
| CWE-20 |
Improper Input Validation |
NIST
|
Change History
2 change records found
- show changes
CVE Modified by MITRE -
10/29/2019 3:15:17 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://usn.ubuntu.com/4168-1/ [No Types Assigned] |
Initial Analysis -
10/28/2019 2:53:22 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:a:gnu:libidn2:*:*:*:*:*:*:*:* versions up to (excluding) 2.2.0 |
| Added |
CVSS V2 |
|
NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N) |
| Added |
CVSS V3.1 |
|
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
| Added |
CWE |
|
NIST CWE-20 |
| Changed |
Reference Type |
https://gitlab.com/libidn/libidn2/commit/241e8f486134793cb0f4a5b0e5817a97883401f5 No Types Assigned |
https://gitlab.com/libidn/libidn2/commit/241e8f486134793cb0f4a5b0e5817a97883401f5 Patch, Third Party Advisory |
| Changed |
Reference Type |
https://gitlab.com/libidn/libidn2/commit/614117ef6e4c60e1950d742e3edf0a0ef8d389de No Types Assigned |
https://gitlab.com/libidn/libidn2/commit/614117ef6e4c60e1950d742e3edf0a0ef8d389de Third Party Advisory |
| Changed |
Reference Type |
https://gitlab.com/libidn/libidn2/merge_requests/71 No Types Assigned |
https://gitlab.com/libidn/libidn2/merge_requests/71 Patch, Third Party Advisory |