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dnsmasq におけるスプーフィングによる認証回避に関する脆弱性
Title dnsmasq におけるスプーフィングによる認証回避に関する脆弱性
Summary

dnsmasq には、スプーフィングによる認証回避に関する脆弱性が存在します。

Possible impacts 情報を改ざんされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date Oct. 21, 2020, midnight
Registration Date Oct. 6, 2021, 12:28 p.m.
Last Update Oct. 6, 2021, 12:28 p.m.
CVSS3.0 : 低
Score 3.7
Vector CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS2.0 : 警告
Score 4.3
Vector AV:N/AC:M/Au:N/C:N/I:P/A:N
Affected System
Debian
Debian GNU/Linux 
Fedora Project
Fedora 
thekelleys
Dnsmasq 2.83 未満
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
その他
Change Log
No Changed Details Date of change
1 [2021年10月06日]
  掲載		 Oct. 6, 2021, 12:28 p.m.
NVD Vulnerability Information
CVE-2020-25686
Summary

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.

Publication Date Jan. 21, 2021, 2:15 a.m.
Registration Date Jan. 26, 2021, 10:40 a.m.
Last Update Nov. 21, 2024, 2:18 p.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:a:thekelleys:dnsmasq:*:*:*:*:*:*:*:* 2.83
Configuration2 or higher or less more than less than
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
Configuration3 or higher or less more than less than
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Configuration4 or higher or less more than less than
cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* 4.21 4.21.14m
cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* 4.22 4.22.9m
cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* 4.23 4.23.7m
cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* 4.24 4.24.5m
cpe:2.3:o:arista:eos:*:*:*:*:*:*:*:* 4.25 4.25.2f
Related information, measures and tools
Common Vulnerabilities List