CVE-2024-24806: Improper Domain Lookup that potentially leads to SSRF attacks in libuv

Vulnerability summary

CVE-2024-24806 is a high (CVSS 7.3) Server-Side Request Forgery vulnerability in libuv. EPSS estimates a 2.00% chance of exploitation in the next 30 days, higher than 80.8% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 07-02-2024
   PublishedVulnerability first disclosed.
2. 17-06-2025
   Last modifiedVulnerability information updated.

Description

libuv is a multi-platform support library with a focus on asynchronous I/O. The `uv_getaddrinfo` function in `src/unix/getaddrinfo.c` (and its windows counterpart `src/win/getaddrinfo.c`), truncates hostnames to 256 characters before calling `getaddrinfo`. This behavior can be exploited to create addresses like `0x00007f000001`, which are considered valid by `getaddrinfo` and could allow an attacker to craft payloads that resolve to unintended IP addresses, bypassing developer checks. The vulnerability arises due to how the `hostname_ascii` variable (with a length of 256 bytes) is handled in `uv_getaddrinfo` and subsequently in `uv__idna_toascii`. When the hostname exceeds 256 characters, it gets truncated without a terminating null byte. As a result attackers may be able to access internal APIs or for websites (similar to MySpace) that allows users to have `username.example.com` pages. Internal services that crawl or cache these user pages can be exposed to SSRF attacks if a malicious user chooses a long vulnerable username. This issue has been addressed in release version 1.48.0. Users are advised to upgrade. There are no known workarounds for this vulnerability.

• CWE-918Server-Side Request ForgeryThe web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.