cnvd - cnvd-2021-16429

cnvd-2021-16429

Vulnerability from cnvd

Title: Dnsmasq安全特征问题漏洞（CNVD-2021-16429）

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，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。

Severity: 中

Patch Name: Dnsmasq安全特征问题漏洞（CNVD-2021-16429）的补丁

Patch 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，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。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description:

目前厂商已发布升级补丁以修复漏洞，补丁获取链接： https://www.jsof-tech.com/disclosures/dnspooq/

Reference: https://www.jsof-tech.com/disclosures/dnspooq/

Impacted products

Name
Dnsmasq Dnsmasq 2.83

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2020-25686",
      "cveUrl": "https://nvd.nist.gov/vuln/detail/CVE-2020-25686"
    }
  },
  "description": "Dnsmasq\u662f\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\u7684\u8f7b\u91cf\u7ea7DNS\u8f6c\u53d1\u548cDHCP\u3001TFTP\u670d\u52a1\u5668\u3002\n\nDnsmasq\u5b58\u5728\u5b89\u5168\u7279\u5f81\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4e0d\u4f1a\u68c0\u67e5\u73b0\u6709\u7684\u540c\u540d\u5f85\u5904\u7406\u8bf7\u6c42\uff0c\u5e76\u8f6c\u53d1\u4e00\u4e2a\u65b0\u7684\u8bf7\u6c42\uff0c\u5141\u8bb8\u653b\u51fb\u8005\u6267\u884c\u4e00\u4e2a\u201c\u751f\u65e5\u653b\u51fb\u201d\u573a\u666f\u6765\u4f2a\u9020\u5e94\u7b54\uff0c\u5e76\u53ef\u80fd\u7834\u574fDNS\u7f13\u5b58\u3002",
  "formalWay": "\u76ee\u524d\u5382\u5546\u5df2\u53d1\u5e03\u5347\u7ea7\u8865\u4e01\u4ee5\u4fee\u590d\u6f0f\u6d1e\uff0c\u8865\u4e01\u83b7\u53d6\u94fe\u63a5\uff1a\r\nhttps://www.jsof-tech.com/disclosures/dnspooq/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-16429",
  "openTime": "2021-03-11",
  "patchDescription": "Dnsmasq\u662f\u4e00\u6b3e\u4f7f\u7528C\u8bed\u8a00\u7f16\u5199\u7684\u8f7b\u91cf\u7ea7DNS\u8f6c\u53d1\u548cDHCP\u3001TFTP\u670d\u52a1\u5668\u3002\r\n\r\nDnsmasq\u5b58\u5728\u5b89\u5168\u7279\u5f81\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u4e0d\u4f1a\u68c0\u67e5\u73b0\u6709\u7684\u540c\u540d\u5f85\u5904\u7406\u8bf7\u6c42\uff0c\u5e76\u8f6c\u53d1\u4e00\u4e2a\u65b0\u7684\u8bf7\u6c42\uff0c\u5141\u8bb8\u653b\u51fb\u8005\u6267\u884c\u4e00\u4e2a\u201c\u751f\u65e5\u653b\u51fb\u201d\u573a\u666f\u6765\u4f2a\u9020\u5e94\u7b54\uff0c\u5e76\u53ef\u80fd\u7834\u574fDNS\u7f13\u5b58\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "Dnsmasq\u5b89\u5168\u7279\u5f81\u95ee\u9898\u6f0f\u6d1e\uff08CNVD-2021-16429\uff09\u7684\u8865\u4e01",
  "products": {
    "product": "Dnsmasq Dnsmasq 2.83"
  },
  "referenceLink": "https://www.jsof-tech.com/disclosures/dnspooq/",
  "serverity": "\u4e2d",
  "submitTime": "2021-01-25",
  "title": "Dnsmasq\u5b89\u5168\u7279\u5f81\u95ee\u9898\u6f0f\u6d1e\uff08CNVD-2021-16429\uff09"
}

CVE-2020-25686 (GCVE-0-2020-25686)

Vulnerability from cvelistv5

Published

2021-01-20 16:47

Modified

2024-08-04 15:40

Severity ?

CWE

CWE-358

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.

References

▼	URL	Tags
	https://www.jsof-tech.com/disclosures/dnspooq/	x_refsource_MISC
	https://bugzilla.redhat.com/show_bug.cgi?id=1890125	x_refsource_MISC
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKOYKL5FT3ACTIHWHGQY32/	vendor-advisory, x_refsource_FEDORA
	https://security.gentoo.org/glsa/202101-17	vendor-advisory, x_refsource_GENTOO
	https://www.debian.org/security/2021/dsa-4844	vendor-advisory, x_refsource_DEBIAN
	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLEPSMLDGOMXQKG3KM2QME/	vendor-advisory, x_refsource_FEDORA
	https://www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	n/a	dnsmasq	Version: dnsmasq 2.83

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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