CVE-2020-25685Not scoredCWE-326

CVE-2020-25685: Thekelleys dnsmasq vulnerability

Thekelleys · dnsmasq

Fixed in 2.83 · Affected: Thekelleys dnsmasq before 2.83 · Exploitation: possible (1 to 10%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

2.2%probability of exploitation in the next 30 days

83rd percentile

050100

Higher than 83% of scored CVEs

Not scored yet. The CVE record carries no CVSS score.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

dnsmasqdnsmasq 2.83

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Exploitation: Possible (1 to 10%). EPSS between 1% and 10%.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Inadequate Encryption Strength · Cryptography
Vendor: Thekelleys
Published: January 2021
Band: Possible (1 to 10%), January 2021

CoverageNo articles yet

No CyberSIXT article names CVE-2020-25685 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.