| 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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