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CVE-2020-25686

Quick assessment

Affected
n/a dnsmasq
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Dnsmasq是一款使用C语言编写的轻量级DNS转发和DHCP、TFTP服务器。 Dnsmasq 存在安全特征问题漏洞，该漏洞源于不会检查现有的同名待处理请求，并转发一个新的请求，从而允许攻击者执行一个“生日攻击”场景来伪造应答，并可能破坏DNS缓存。

AI Predicted 5.9 Difficulty: Moderate EPSS 4.87% · P92
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I. Basic Information for CVE-2020-25686

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当实现的标准安全检查
Source: CVE Program / CVE List V5
Vulnerability Title
Dnsmasq 安全特征问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dnsmasq是一款使用C语言编写的轻量级DNS转发和DHCP、TFTP服务器。 Dnsmasq 存在安全特征问题漏洞，该漏洞源于不会检查现有的同名待处理请求，并转发一个新的请求，从而允许攻击者执行一个“生日攻击”场景来伪造应答，并可能破坏DNS缓存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- dnsmasq dnsmasq 2.83 -

II. Public POCs for CVE-2020-25686

# POC Description Source Link Shenlong Link
1 DNSpooq - dnsmasq cache poisoning (CVE-2020-25686, CVE-2020-25684, CVE-2020-25685) https://github.com/knqyf263/dnspooq POC Details
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III. Intelligence Information for CVE-2020-25686

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Vendor Advisories for CVE-2020-25686 (3)

Mailing List Discussions for CVE-2020-25686 (2)

Other References for CVE-2020-25686 (2)

Same Patch Batch · n/a · 2021-01-20 · 34 CVEs total

CVE-2020-28483 7.1 HIGH HTTP Response Splitting
CVE-2021-23326 6.3 MEDIUM Command Injection
CVE-2020-28452 6.3 MEDIUM Cross-site Request Forgery (CSRF)
CVE-2020-25385 Nagios Log Server 跨站脚本漏洞
CVE-2021-3110 Prestashop SQL注入漏洞
CVE-2021-3137 XWiki 跨站脚本漏洞
CVE-2020-27851 Rocketgenius Gravity Forms 跨站脚本漏洞
CVE-2020-27852 Rocketgenius Gravity Forms 跨站脚本漏洞
CVE-2020-27850 Rocketgenius Gravity Forms 跨站脚本漏洞
CVE-2020-13133 Tufin Securechange 跨站脚本漏洞
CVE-2020-13134 Tufin Securechange 跨站脚本漏洞
CVE-2020-14360 X.Org Server 缓冲区错误漏洞
CVE-2020-19364 OpenEMR 代码问题漏洞
CVE-2020-19363 Vtiger CRM 信息泄露漏洞
CVE-2020-19362 Vtiger CRM 跨站脚本漏洞
CVE-2020-19361 MedinTux 跨站脚本漏洞
CVE-2020-19360 FHEM 信息泄露漏洞
CVE-2020-25685 dnsmasq 加密问题漏洞
CVE-2020-35217 Eclipse Vertx-web 跨站请求伪造漏洞
CVE-2020-35239 CakePHP 跨站请求伪造漏洞

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: dnsmasq
Same vendor: n/a
Same weakness: CWE-358

V. Comments for CVE-2020-25686

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