Description

Astro is a web framework. Prior to version 9.5.4, Server-Side Rendered pages that return an error with a prerendered custom error page (eg. `404.astro` or `500.astro`) are vulnerable to SSRF. If the `Host:` header is changed to an attacker's server, it will be fetched on `/500.html` and they can redirect this to any internal URL to read the response body through the first request. An attacker who can access the application without `Host:` header validation (eg. through finding the origin IP behind a proxy, or just by default) can fetch their own server to redirect to any internal IP. With this they can fetch cloud metadata IPs and interact with services in the internal network or localhost. For this to be vulnerable, a common feature needs to be used, with direct access to the server (no proxies). Version 9.5.4 fixes the issue.

Weaknesses 1

Affected Products 1

References 3

• github.com https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
  Patch
• github.com https://github.com/withastro/astro/releases/tag/%40astrojs%2Fnode%409.5.4
  ProductRelease Notes
• github.com https://github.com/withastro/astro/security/advisories/GHSA-qq67-mvv5-fw3g
  ExploitThird Party Advisory

Remediation

• github.com https://github.com/withastro/astro/commit/e01e98b063e90d274c42130ec2a60cc0966622c9
  Patch