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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.
| Reporter | Title | Published | Views | Family All 258 |
|---|---|---|---|---|
 | Exploit for Improperly Implemented Security Check for Standard in Thekelleys Dnsmasq | 19 Oct 202117:01 | – | gitee |
 | dnsmasq -- DNS cache poisoning, and DNSSEC buffer overflow, vulnerabilities | 16 Sep 202000:00 | – | freebsd |
 | Security fix for the ALT Linux 10 package dnsmasq version 2.83-alt1 | 22 Jan 202100:00 | – | altlinux |
 | Amazon Linux 2 : dnsmasq (ALAS-2021-1587) | 26 Jan 202100:00 | – | nessus |
| Alibaba Cloud Linux 3 : 0009: dnsmasq (ALINUX3-SA-2021:0009) | 14 May 202500:00 | – | nessus |
| CentOS 8 : dnsmasq (CESA-2021:0150) | 29 Jan 202100:00 | – | nessus |
| CentOS 7 : dnsmasq (RHSA-2021:0153) | 26 Jan 202100:00 | – | nessus |
| Debian DLA-2604-1 : dnsmasq security update | 23 Mar 202100:00 | – | nessus |
| Debian DSA-4844-1 : dnsmasq - security update | 5 Feb 202100:00 | – | nessus |
| dnsmasq < 2.83 Multiple Vulnerabilities (DNSPOOQ) | 19 Jan 202100:00 | – | nessus |
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29 Jan 2021 08:00Current
7High risk
Vulners AI Score7
CVSS 3.13.7
CVSS 24.3
EPSS0.00423