dnsmasq
At a glance
- Source
- NVD
- EPSS
- EPSS 2.23 % · percentile 83 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Modified
Description
A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25684 the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Weaknesses (CWE)
- CWE-326 — Inadequate Encryption Strength
References
- https://www.jsof-tech.com/disclosures/dnspooq/
- https://bugzilla.redhat.com/show_bug.cgi?id=1889688
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/
- https://security.gentoo.org/glsa/202101-17
- https://www.debian.org/security/2021/dsa-4844
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/
- https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61
- https://www.kb.cert.org/vuls/id/434904
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | LOW 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2020-18347
- GCVE · GCVE-0-2020-25685
CERT-FR advisories
- CERTFR-2022-AVI-007 — Multiples vulnérabilités dans les produits Moxa · cert.ssi.gouv.fr
- CERTFR-2021-AVI-497 — Multiples vulnérabilités dans les produits QNAP · cert.ssi.gouv.fr
- CERTFR-2021-AVI-142 — Multiples vulnérabilités dans les produits Aruba · cert.ssi.gouv.fr
- CERTFR-2021-AVI-041 — Multiples vulnérabilités dans les produits Siemens · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*< 2.83cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*≥ 4.21 < 4.21.14mcpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*≥ 4.22 < 4.22.9mcpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*≥ 4.23 < 4.23.7mcpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*≥ 4.24 < 4.24.5mcpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*≥ 4.25 < 4.25.2f
Affected products
| Product | Versions |
|---|---|
| dnsmasq | affected dnsmasq 2.83 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |