Improper input validation in GNU Libidn2
CVE-2019-12290
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.030 (86.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 86.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.030 · newest: 0.030 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gitlab.com/libidn/libidn2/merge_requests/71 (Patch, Third Party Advisory)
- gitlab.com/libidn/libidn2/commit/241e8f486134793cb0f4a5b0e5817a97883401f5 (Patch, Third Party Advisory)
- gitlab.com/libidn/libidn2/commit/614117ef6e4c60e1950d742e3edf0a0ef8d389de (Third Party Advisory)
- usn.ubuntu.com/4168-1/ (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-12/msg00009.html (vendor-advisory)
- lists.opensuse.org/opensuse-security-announce/2019-12/msg00008.html (vendor-advisory)
Frequently asked questions
- What is CVE-2019-12290?
- CVE-2019-12290 is a high-severity vulnerability in GNU Libidn2, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2019-10-22.
- How severe is CVE-2019-12290?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-12290 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.