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RedhatCVE-2020-25684

HistoryJan 20, 2021 - 4:15 p.m.

CVE-2020-25684

2021-01-2016:15:14

CWE-358

redhat

web.nvd.nist.gov

546

dnsmasq

dns

cache poisoning

security

vulnerability

cve-2020-25684

nvd

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

3.7

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

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

AI Score

Confidence

Low

EPSS

0.012

Percentile

85.0%

JSON

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query’s attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

Affected configurations

Nvd

Vulners

Node

thekelleysdnsmasqRange<2.83

Node

fedoraprojectfedoraMatch32

fedoraprojectfedoraMatch33

Node

debiandebian_linuxMatch9.0

debiandebian_linuxMatch10.0

Node

aristaeosRange4.21–4.21.14m

aristaeosRange4.22–4.22.9m

aristaeosRange4.23–4.23.7m

aristaeosRange4.24–4.24.5m

aristaeosRange4.25–4.25.2f

VendorProductVersionCPE
thekelleysdnsmasq*cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:*
fedoraprojectfedora32cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
fedoraprojectfedora33cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
debiandebian_linux9.0cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debiandebian_linux10.0cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
aristaeos*cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
thekelleys	dnsmasq	*	cpe:2.3:a:thekelleys:dnsmasq::::::::
fedoraproject	fedora	32	cpe:2.3:o:fedoraproject:fedora:32:::::::*
fedoraproject	fedora	33	cpe:2.3:o:fedoraproject:fedora:33:::::::*
debian	debian_linux	9.0	cpe:2.3:o:debian:debian_linux:9.0:::::::*
debian	debian_linux	10.0	cpe:2.3:o:debian:debian_linux:10.0:::::::*
arista	eos	*	cpe:2.3:o:arista:eos::::::::

CNA Affected

[
  {
    "product": "dnsmasq",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "dnsmasq 2.83"
      }
    ]
  }
]