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CVE-2020-25682

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，该漏洞源于在用DNSSEC数据验证DNS包之前，dnsmasq从DNS包中提取名称的方式存在缓冲区溢出漏洞。

AI Predicted 7.8 Difficulty: Moderate EPSS 70.75% · P99
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I. Basic Information for CVE-2020-25682

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 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as 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，该漏洞源于在用DNSSEC数据验证DNS包之前，dnsmasq从DNS包中提取名称的方式存在缓冲区溢出漏洞。
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-2020-25682

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III. Intelligence Information for CVE-2020-25682

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Vendor Advisories for CVE-2020-25682 (3)

Mailing List Discussions for CVE-2020-25682 (3)

Other References for CVE-2020-25682 (1)

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

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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
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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-2020-25682

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