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CVE-2024-6874— macidn punycode buffer overread

Quick assessment

Affected
curl curl
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.

libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl URL API 8.8.0版本存在安全漏洞，该漏洞源于函数curl_url_get()在处理IDN转换时，会读取基于堆栈的缓冲区之外的内容，可能导致堆栈内容意外作为转换后的字符串的一部分返回。

AI Predicted 5.3 Difficulty: Easy EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2024-6874

Vulnerability Information
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Vulnerability Title
macidn punycode buffer overread
Source: CVE Program / CVE List V5
Vulnerability Description
libcurl's URL API function [curl_url_get()](https://curl.se/libcurl/c/curl_url_get.html) offers punycode conversions, to and from IDN. Asking to convert a name that is exactly 256 bytes, libcurl ends up reading outside of a stack based buffer when built to use the *macidn* IDN backend. The conversion function then fills up the provided buffer exactly - but does not null terminate the string. This flaw can lead to stack contents accidently getting returned as part of the converted string.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
libcurl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libcurl是cURL开源的一个免费且易于使用的客户端 URL 传输库。 libcurl URL API 8.8.0版本存在安全漏洞，该漏洞源于函数curl_url_get()在处理IDN转换时，会读取基于堆栈的缓冲区之外的内容，可能导致堆栈内容意外作为转换后的字符串的一部分返回。
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
curl curl 8.8.0 ~ 8.8.0 -

II. Public POCs for CVE-2024-6874

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III. Intelligence Information for CVE-2024-6874

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Mailing List Discussions for CVE-2024-6874 (1)

Other References for CVE-2024-6874 (3)

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl

V. Comments for CVE-2024-6874

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