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CVE-2023-32067— 0-byte UDP payload DoS in c-ares

Quick assessment

Affected
c-ares c-ares
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.

c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.19.1之前版本存在安全漏洞，该漏洞源于容易受到拒绝服务攻击。

CVSS 7.5 · High EPSS 1.56% · P74
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I. Basic Information for CVE-2023-32067

Vulnerability Information
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Vulnerability Title
0-byte UDP payload DoS in c-ares
Source: CVE Program / CVE List V5
Vulnerability Description
c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
c-ares 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
c-ares是c-ares个人开发者的一个用于异步 DNS 请求的 C 库。 c-ares 1.19.1之前版本存在安全漏洞，该漏洞源于容易受到拒绝服务攻击。
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
c-ares c-ares < 1.19.1 -

II. Public POCs for CVE-2023-32067

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III. Intelligence Information for CVE-2023-32067

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Vendor Advisories for CVE-2023-32067 (4)

Mailing List Discussions for CVE-2023-32067 (3)

Other References for CVE-2023-32067 (1)

Same Patch Batch · c-ares · 2023-05-25 · 4 CVEs total

CVE-2023-31147 5.9 MEDIUM Insufficient randomness in generation of DNS query IDs in c-ares
CVE-2023-31130 4.1 MEDIUM Buffer Underwrite in ares_inet_net_pton()
CVE-2023-31124 3.7 LOW AutoTools does not set CARES_RANDOM_FILE during cross compilation

IV. Related Vulnerabilities

Same product: c-ares
Same vendor: c-ares
Same weakness: CWE-400

V. Comments for CVE-2023-32067

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