CVE-2020-25686

MEDIUM

Description

A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. 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.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1890125

https://lists.fedoraproject.org/archives/list/[email protected]/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/

https://lists.fedoraproject.org/archives/list/[email protected]/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/

https://security.gentoo.org/glsa/202101-17

https://www.debian.org/security/2021/dsa-4844

https://www.jsof-tech.com/disclosures/dnspooq/

Details

Source: MITRE

Published: 2021-01-20

Updated: 2021-02-22

Type: CWE-358

Risk Information

CVSS v2.0

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 3.7

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Impact Score: 1.4

Exploitability Score: 2.2

Severity: LOW

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*

Configuration 2

OR

cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Configuration 3

OR

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Tenable Plugins

View all (45 total)

IDNameProductFamilySeverity
148613EulerOS : dnsmasq (EulerOS-SA-2021-1733)NessusHuawei Local Security Checks
high
148581EulerOS : dnsmasq (EulerOS-SA-2021-1758)NessusHuawei Local Security Checks
high
148050EulerOS 2.0 SP5 : dnsmasq (EulerOS-SA-2021-1673)NessusHuawei Local Security Checks
high
147582EulerOS Virtualization for ARM 64 3.0.2.0 : dnsmasq (EulerOS-SA-2021-1389)NessusHuawei Local Security Checks
high
147517EulerOS Virtualization 3.0.6.6 : dnsmasq (EulerOS-SA-2021-1469)NessusHuawei Local Security Checks
high
147462EulerOS Virtualization 3.0.2.6 : dnsmasq (EulerOS-SA-2021-1411)NessusHuawei Local Security Checks
high
147341NewStart CGSL MAIN 6.02 : dnsmasq Multiple Vulnerabilities (NS-SA-2021-0091)NessusNewStart CGSL Local Security Checks
high
147133EulerOS Virtualization for ARM 64 3.0.6.0 : dnsmasq (EulerOS-SA-2021-1551)NessusHuawei Local Security Checks
high
146735EulerOS 2.0 SP3 : dnsmasq (EulerOS-SA-2021-1374)NessusHuawei Local Security Checks
high
146697EulerOS 2.0 SP2 : dnsmasq (EulerOS-SA-2021-1288)NessusHuawei Local Security Checks
high
146369Slackware 14.0 / 14.1 / 14.2 / current : dnsmasq (SSA:2021-040-01)NessusSlackware Local Security Checks
high
146242Debian DSA-4844-1 : dnsmasq - security updateNessusDebian Local Security Checks
high
146224EulerOS : dnsmasq (EulerOS-SA-2021-1263)NessusHuawei Local Security Checks
high
146218EulerOS 2.0 SP9 : dnsmasq (EulerOS-SA-2021-1244)NessusHuawei Local Security Checks
high
146094RHEL 8 : Red Hat Virtualization Host security bug fix and enhancement update [ovirt-4.4.4] (Important) (RHSA-2021:0401)NessusRed Hat Local Security Checks
high
146093RHEL 7 : RHV-H security, bug fix, enhancement update (redhat-virtualization-host) 4.3.13 (Important) (RHSA-2021:0395)NessusRed Hat Local Security Checks
high
145737EulerOS 2.0 SP8 : dnsmasq (EulerOS-SA-2021-1138)NessusHuawei Local Security Checks
high
145698CentOS 8 : dnsmasq (CESA-2021:0150)NessusCentOS Local Security Checks
high
145454Amazon Linux 2 : dnsmasq (ALAS-2021-1587)NessusAmazon Linux Local Security Checks
medium
145439CentOS 7 : dnsmasq (CESA-2021:0153)NessusCentOS Local Security Checks
medium
145438Scientific Linux Security Update : dnsmasq on SL7.x x86_64 (2021:0153)NessusScientific Linux Local Security Checks
medium
145421Photon OS 2.0: Dnsmasq PHSA-2021-2.0-0312NessusPhotonOS Local Security Checks
high
145420Photon OS 1.0: Dnsmasq PHSA-2021-1.0-0356NessusPhotonOS Local Security Checks
high
145414Photon OS 3.0: Dnsmasq PHSA-2021-3.0-0186NessusPhotonOS Local Security Checks
high
145404RHEL 7 : dnsmasq (RHSA-2021:0245)NessusRed Hat Local Security Checks
medium
145403RHEL 7 : dnsmasq (RHSA-2021:0240)NessusRed Hat Local Security Checks
medium
145356openSUSE Security Update : dnsmasq (openSUSE-2021-124)NessusSuSE Local Security Checks
high
145295openSUSE Security Update : dnsmasq (openSUSE-2021-129)NessusSuSE Local Security Checks
high
145282GLSA-202101-17 : Dnsmasq: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
145241Fedora 33 : dnsmasq (2021-84440e87ba)NessusFedora Local Security Checks
high
145236FreeBSD : dnsmasq -- DNS cache poisoning, and DNSSEC buffer overflow, vulnerabilities (5b5cf6e5-5b51-11eb-95ac-7f9491278677)NessusFreeBSD Local Security Checks
high
145199SUSE SLES15 Security Update : dnsmasq (SUSE-SU-2021:0162-1)NessusSuSE Local Security Checks
high
145175SUSE SLES12 Security Update : dnsmasq (SUSE-SU-2021:0166-1)NessusSuSE Local Security Checks
high
145108SUSE SLED15 / SLES15 Security Update : dnsmasq (SUSE-SU-2021:0163-1)NessusSuSE Local Security Checks
high
145088RHEL 8 : dnsmasq (RHSA-2021:0150)NessusRed Hat Local Security Checks
high
145087RHEL 7 : dnsmasq (RHSA-2021:0153)NessusRed Hat Local Security Checks
medium
145086Oracle Linux 8 : dnsmasq (ELSA-2021-0150)NessusOracle Linux Local Security Checks
high
145085RHEL 7 : dnsmasq (RHSA-2021:0155)NessusRed Hat Local Security Checks
medium
145083RHEL 7 : dnsmasq (RHSA-2021:0156)NessusRed Hat Local Security Checks
medium
145082RHEL 8 : dnsmasq (RHSA-2021:0152)NessusRed Hat Local Security Checks
high
145079RHEL 7 : dnsmasq (RHSA-2021:0154)NessusRed Hat Local Security Checks
medium
145078Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 20.10 : Dnsmasq vulnerabilities (USN-4698-1)NessusUbuntu Local Security Checks
high
145077RHEL 8 : dnsmasq (RHSA-2021:0151)NessusRed Hat Local Security Checks
high
145075Oracle Linux 7 : dnsmasq (ELSA-2021-0153)NessusOracle Linux Local Security Checks
medium
145073dnsmasq < 2.83 Multiple Vulnerabilities (DNSPOOQ)NessusDNS
high