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GHSA-25gq-jvx2-vg9x: Silverstripe X-Forwarded-Host request hostname injection

A potential hostname injection vulnerability has been found which could allow attackers to alter url resolution.

If a request contains the X-Forwarded-Host HTTP header a website would then use its value in place of the actual HTTP hostname. In cases where caching is enabled, this could allow an attacker to potentially embed a remote url as the base_url for any site. This would then cause other visitors to the site to be redirected unknowingly.

This header is necessary for servers running behind a reverse proxy (such as nginx). Such servers are likely not vulnerable to this risk.

A fix has been merged into the default installer, although existing projects which do not run behind a reverse proxy should update their htaccess as below:

<IfModule mod_headers.c>
    # Remove X-Forwarded-Host header sent as a part of any request from the web
    RequestHeader unset X-Forwarded-Host
</IfModule>
ghsa
#vulnerability#web#git#php#nginx
  1. GitHub Advisory Database
  2. GitHub Reviewed
  3. GHSA-25gq-jvx2-vg9x

Silverstripe X-Forwarded-Host request hostname injection

High severity GitHub Reviewed Published May 23, 2024 to the GitHub Advisory Database • Updated May 23, 2024

Package

composer silverstripe/framework (Composer)

Affected versions

>= 3.1.0, < 3.1.13

A potential hostname injection vulnerability has been found which could allow attackers to alter url resolution.

If a request contains the X-Forwarded-Host HTTP header a website would then use its value in place of the actual HTTP hostname. In cases where caching is enabled, this could allow an attacker to potentially embed a remote url as the base_url for any site. This would then cause other visitors to the site to be redirected unknowingly.

This header is necessary for servers running behind a reverse proxy (such as nginx). Such servers are likely not vulnerable to this risk.

A fix has been merged into the default installer, although existing projects which do not run behind a reverse proxy should update their htaccess as below:

<IfModule mod_headers.c>
    # Remove X-Forwarded-Host header sent as a part of any request from the web
    RequestHeader unset X-Forwarded-Host
</IfModule>

References

  • silverstripe/silverstripe-framework@75137db
  • https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/SS-2015-013-1.yaml
  • https://www.silverstripe.org/software/download/security-releases/ss-2015-013

Published to the GitHub Advisory Database

May 23, 2024

Last updated

May 23, 2024

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