ghsa-9gxq-wfg7-72x4
Vulnerability from github
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.
{ "affected": [], "aliases": [ "CVE-2020-25685" ], "database_specific": { "cwe_ids": [ "CWE-326", "CWE-358" ], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2021-01-20T16:15:00Z", "severity": "MODERATE" }, "details": "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.", "id": "GHSA-9gxq-wfg7-72x4", "modified": "2022-10-07T18:15:55Z", "published": "2022-05-24T17:39:33Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25685" }, { "type": "WEB", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1889688" }, { "type": "WEB", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME" }, { "type": "WEB", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32" }, { "type": "WEB", "url": "https://security.gentoo.org/glsa/202101-17" }, { "type": "WEB", "url": "https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61" }, { "type": "WEB", "url": "https://www.debian.org/security/2021/dsa-4844" }, { "type": "WEB", "url": "https://www.jsof-tech.com/disclosures/dnspooq" } ], "schema_version": "1.4.0", "severity": [ { "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "type": "CVSS_V3" } ] }
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