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[email protected]CVE-2020-25686

HistoryJan 20, 2021 - 5:15 p.m.

CVE-2020-25686

2021-01-2017:15:13

CWE-290

CWE-358

[email protected]

web.nvd.nist.gov

532

dnsmasq

vulnerability

cve-2020-25686

off-path attacker

network security

data integrity

4.3 Medium

CVSS2

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

3.7 Low

CVSS3

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

5.9 Medium

AI Score

Confidence

Low

0.012 Low

EPSS

Percentile

85.1%

JSON

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.

Affected configurations

Vulners

NVD

Node

dnsmasqdnsmasqRange≤2.83

VendorProductVersionCPE
dnsmasqdnsmasq*cpe:2.3:a:dnsmasq:dnsmasq:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
dnsmasq	dnsmasq	*	cpe:2.3:a:dnsmasq:dnsmasq::::::::

CNA Affected

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