4.3
MEDIUM
CVE-2024-6874
Libcurl Punycode Buffer Overflow
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.

INFO

Published Date :

July 24, 2024, 8:15 a.m.

Last Modified :

Sept. 10, 2024, 3:27 p.m.

Source :

2499f714-1537-4658-8207-48ae4bb9eae9

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2024-6874 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Haxx curl
2 Haxx libcurl
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2024-6874.

URL Resource
http://www.openwall.com/lists/oss-security/2024/07/24/2 Mailing List Third Party Advisory
https://curl.se/docs/CVE-2024-6874.html Vendor Advisory
https://curl.se/docs/CVE-2024-6874.json Vendor Advisory
https://hackerone.com/reports/2604391 Exploit Issue Tracking Technical Description

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-6874 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-6874 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Sep. 10, 2024

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
    Changed Reference Type http://www.openwall.com/lists/oss-security/2024/07/24/2 No Types Assigned http://www.openwall.com/lists/oss-security/2024/07/24/2 Mailing List, Third Party Advisory
    Changed Reference Type https://curl.se/docs/CVE-2024-6874.html No Types Assigned https://curl.se/docs/CVE-2024-6874.html Vendor Advisory
    Changed Reference Type https://curl.se/docs/CVE-2024-6874.json No Types Assigned https://curl.se/docs/CVE-2024-6874.json Vendor Advisory
    Changed Reference Type https://hackerone.com/reports/2604391 No Types Assigned https://hackerone.com/reports/2604391 Exploit, Issue Tracking, Technical Description
    Added CWE NIST CWE-125
    Added CPE Configuration OR *cpe:2.3:a:haxx:libcurl:8.8.0:*:*:*:*:*:*:*
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Aug. 01, 2024

    Action Type Old Value New Value
    Added CVSS V3.1 CISA-ADP AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
  • CVE Modified by 2499f714-1537-4658-8207-48ae4bb9eae9

    Jul. 24, 2024

    Action Type Old Value New Value
    Added Reference curl http://www.openwall.com/lists/oss-security/2024/07/24/2 [No types assigned]
  • CVE Received by 2499f714-1537-4658-8207-48ae4bb9eae9

    Jul. 24, 2024

    Action Type Old Value New Value
    Added 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.
    Added Reference curl https://curl.se/docs/CVE-2024-6874.json [No types assigned]
    Added Reference curl https://curl.se/docs/CVE-2024-6874.html [No types assigned]
    Added Reference curl https://hackerone.com/reports/2604391 [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-6874 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-6874 weaknesses.

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability