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CVE detail

CVE-2020-25685

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.

CVSS 3.7 · LowBuzz score 25.4

Buzz score

Why this CVE is surfacing

Buzz score total 25.4

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 13.9 · diversity 11.5 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
13.9
3 evidence mentions in the snapshot
Diversity score
11.5
3 sources across 2 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
3 source links · newest first
  • Overview of dnsmasq Vulnerabilities: The Dangers of DNS Cache PoisoningUnit42

    We review vulnerabilities in dnsmasq, an open source DNS resolver, deep dive into DNS cache poisoning and describe effects on cloud products.

    vendorunit42.paloaltonetworks.comMar 8, 2021, 5:00 PM
  • DNSpooq bugs haunt dnsmasqMalwarebytes Labs

    The research team at JSOF found seven vulnerabilities in dnsmasq and have dubbed them DNSpooq, collectively. Now, some of you may…

    newswww.malwarebytes.comJan 20, 2021, 5:00 PM
  • DNSpooq Flaws Expose Millions of Devices to DNS Cache Poisoning, Other AttacksSecurityWeek

    Researchers at Israel-based boutique cybersecurity consultancy JSOF this week disclosed the details of seven potentially serious DNS-related vulnerabilities that could expose millions of devices to various types of attacks.

    newswww.securityweek.comJan 20, 2021, 11:37 AM

Exploit code

Public exploit repository references

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0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

Related records

Similar CVEs

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