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CVE-2020-25687

Quick assessment

Affected
n/a dnsmasq
Exploitation
High exploitation probability; assess promptly
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 存在缓冲区错误漏洞，该漏洞源于sort rrset子例程中的基于堆的缓冲区溢出，该子例程在启用DNSSEC时并在验证接收到的DNS条目之前发生。

AI Predicted 5.3 Difficulty: Moderate EPSS 86.69% · P100
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I. Basic Information for CVE-2020-25687

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. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Dnsmasq 缓冲区错误漏洞
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 存在缓冲区错误漏洞，该漏洞源于sort rrset子例程中的基于堆的缓冲区溢出，该子例程在启用DNSSEC时并在验证接收到的DNS条目之前发生。
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-2020-25687

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III. Intelligence Information for CVE-2020-25687

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Vendor Advisories for CVE-2020-25687 (3)

Mailing List Discussions for CVE-2020-25687 (3)

Other References for CVE-2020-25687 (1)

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

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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-122

V. Comments for CVE-2020-25687

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