gsd-2020-25685
Vulnerability from gsd
Modified
2023-12-13 01:21
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.
Aliases
Aliases
{
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"alias": "CVE-2020-25685",
"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.",
"id": "GSD-2020-25685",
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"https://www.suse.com/security/cve/CVE-2020-25685.html",
"https://www.debian.org/security/2021/dsa-4844",
"https://access.redhat.com/errata/RHSA-2021:0401",
"https://access.redhat.com/errata/RHSA-2021:0395",
"https://access.redhat.com/errata/RHSA-2021:0245",
"https://access.redhat.com/errata/RHSA-2021:0240",
"https://access.redhat.com/errata/RHSA-2021:0156",
"https://access.redhat.com/errata/RHSA-2021:0155",
"https://access.redhat.com/errata/RHSA-2021:0154",
"https://access.redhat.com/errata/RHSA-2021:0153",
"https://access.redhat.com/errata/RHSA-2021:0152",
"https://access.redhat.com/errata/RHSA-2021:0151",
"https://access.redhat.com/errata/RHSA-2021:0150",
"https://ubuntu.com/security/CVE-2020-25685",
"https://advisories.mageia.org/CVE-2020-25685.html",
"https://security.archlinux.org/CVE-2020-25685",
"https://linux.oracle.com/cve/CVE-2020-25685.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
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"modified": "2023-12-13T01:21:56.939180Z",
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"accessVector": "NETWORK",
"authentication": "NONE",
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"baseScore": 4.3,
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"confidentialityImpact": "NONE",
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"scope": "UNCHANGED",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
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},
"lastModifiedDate": "2022-12-08T03:08Z",
"publishedDate": "2021-01-20T16:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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