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CVE-2023-3036— Out of Bounds Slice index in cfnts leads to remote panic

Quick assessment

Affected
Cloudflare cfnts
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.

Cloudflare cfnts是Cloudflare公司的用 Rust 编写的 NTS 协议的实现。 cfnts 783490b之前版本存在安全漏洞，该漏洞源于NTP 服务器中未经检查的读取使远程攻击者能够通过发送扩展长度长于数据包内容的 NTSAuthenticator 数据包来触发恐慌。

CVSS 8.6 · High EPSS 2.24% · P82

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-3036

Vulnerability Information
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Vulnerability Title
Out of Bounds Slice index in cfnts leads to remote panic
Source: CVE Program / CVE List V5
Vulnerability Description
An unchecked read in NTP server in github.com/cloudflare/cfnts prior to commit 783490b https://github.com/cloudflare/cfnts/commit/783490b913f05e508a492cd7b02e3c4ec2297b71  enabled a remote attacker to trigger a panic by sending an NTSAuthenticator packet with extension length longer than the packet contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
cfnts 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cloudflare cfnts是Cloudflare公司的用 Rust 编写的 NTS 协议的实现。 cfnts 783490b之前版本存在安全漏洞，该漏洞源于NTP 服务器中未经检查的读取使远程攻击者能够通过发送扩展长度长于数据包内容的 NTSAuthenticator 数据包来触发恐慌。
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
Cloudflare cfnts 0 ~ < 783490b -

II. Public POCs for CVE-2023-3036

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III. Intelligence Information for CVE-2023-3036

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Vendor Advisories for CVE-2023-3036 (1)

IV. Related Vulnerabilities

Same vendor: Cloudflare
Same weakness: CWE-119

V. Comments for CVE-2023-3036

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