CVE-2024-24806: libuv SSRF — Exploit & Fix

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.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
libuv	libuv	1.24.0 — 1.48.0

References

Advisories & Patches

Exploits

https://github.com/libuv/libuv/security/advisories/GHSA-f74f-cvh7-c6q6 https://github.com/libuv/libuv/security/advisories/GHSA-f74f-cvh7-c6q6

Other References

http://www.openwall.com/lists/oss-security/2024/02/08/2 http://www.openwall.com/lists/oss-security/2024/02/11/1 http://www.openwall.com/lists/oss-security/2024/03/11/1 https://gitlab.kitware.com/cmake/cmake/-/issues/26112 https://lists.debian.org/debian-lts-announce/2024/03/msg00005.html https://security.netapp.com/advisory/ntap-20240605-0008/ http://www.openwall.com/lists/oss-security/2024/02/08/2 http://www.openwall.com/lists/oss-security/2024/02/11/1 http://www.openwall.com/lists/oss-security/2024/03/11/1 https://gitlab.kitware.com/cmake/cmake/-/issues/26112

Frequently Asked Questions

What is CVE-2024-24806? +

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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2024-24806? +

CVE-2024-24806 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-24806? +

CVE-2024-24806 affects products from libuv, specifically: libuv. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-24806? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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