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CVE-2020-25685

Quick assessment

Affected
n/a dnsmasq
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 存在加密问题漏洞，该漏洞源于在没有dnnssec的情况下编译时使用弱哈希算法(CRC32)来验证DNS响应。

AI Predicted 6.6 Difficulty: Moderate EPSS 2.18% · P82
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I. Basic Information for CVE-2020-25685

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 getting a reply from a forwarded query, dnsmasq checks in forward.c:reply_query(), which is the forwarded query that matches the reply, by only using a weak hash of the query name. Due to the weak hash (CRC32 when dnsmasq is compiled without DNSSEC, SHA-1 when it is) this flaw allows an off-path attacker to find several different domains all having the same hash, substantially reducing the number of attempts they would have to perform to forge a reply and get it accepted by dnsmasq. This is in contrast with RFC5452, which specifies that the query name is one of the attributes of a query that must be used to match a reply. This flaw could be abused to perform a DNS Cache Poisoning attack. 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
不充分的加密强度
Source: CVE Program / CVE List V5
Vulnerability Title
dnsmasq 加密问题漏洞
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 存在加密问题漏洞，该漏洞源于在没有dnnssec的情况下编译时使用弱哈希算法(CRC32)来验证DNS响应。
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-2020-25685

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III. Intelligence Information for CVE-2020-25685

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Vendor Advisories for CVE-2020-25685 (3)

Mailing List Discussions for CVE-2020-25685 (2)

Other References for CVE-2020-25685 (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-2020-13134 Tufin Securechange 跨站脚本漏洞
CVE-2020-35217 Eclipse Vertx-web 跨站请求伪造漏洞
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-2020-25684 Dnsmasq 安全漏洞
CVE-2020-25385 Nagios Log Server 跨站脚本漏洞
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-2020-14360 X.Org Server 缓冲区错误漏洞
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-326

V. Comments for CVE-2020-25685

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