CVE-2024-6874

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.

CVSS Metrics

• v3.1•LOW•Score: 3.1CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
• v3.1•MEDIUM•Score: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Trends

Current EPSS score: 0.79%• Percentile: 52%

Techniques & Countermeasures

• CWE-125•Out-of-bounds Read

  The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

• curl•curl

  8.8.0

• haxx•libcurl

  8.8.0

References (5)

• https://curl.se/docs/CVE-2024-6874.json
• https://curl.se/docs/CVE-2024-6874.html
• https://hackerone.com/reports/2604391
• http://www.openwall.com/lists/oss-security/2024/07/24/2
• https://security.netapp.com/advisory/ntap-20240822-0004/