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CVE-2023-31147— Insufficient randomness in generation of DNS query IDs 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，该漏洞源于会生成可预测的输出。

CVSS 5.9 · Medium EPSS 0.90% · P58

Possible ATT&CK Techniques 2 AI

T1557 · Adversary-in-the-Middle T1043
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I. Basic Information for CVE-2023-31147

Vulnerability Information
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Vulnerability Title
Insufficient randomness in generation of DNS query IDs in c-ares
Source: CVE Program / CVE List V5
Vulnerability Description
c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不充分的随机数
Source: CVE Program / CVE List V5
Vulnerability Title
c-ares 安全特征问题漏洞
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，该漏洞源于会生成可预测的输出。
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-2023-31147

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III. Intelligence Information for CVE-2023-31147

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Vendor Advisories for CVE-2023-31147 (2)

Mailing List Discussions for CVE-2023-31147 (2)

Other References for CVE-2023-31147 (1)

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

CVE-2023-32067 7.5 HIGH 0-byte UDP payload DoS 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-330

V. Comments for CVE-2023-31147

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