GHSA-4h8f-c635-25p7 ibexa/post-install affected by Breach with Varnish VCL
Attackers can extract secrets from HTTP responses via BREACH attack due to enabled compression in default Varnish and web server templates.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is GHSA-4h8f-c635-25p7?
GHSA-4h8f-c635-25p7 is a vulnerability in ibexa/post-install, published on 2 Dec 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Impact
This is not a vulnerability in the code per se, but included platform.sh Varnish VCL templates and Apache/Nginx vhost templates enable compression of API and JSON messages. This is a potential case of the BREACH vulnerability, which affects HTTP compression, where secrets can be extracted through carefully crafted requests. The fix disables compression in these templates. Please make sure to make the same change in your configuration files, see the release notes for specific instructions.
Patches
- See "Patched versions".
- v1.0: https://github.com/ibexa/post-install/commit/d91cc02623dd3263a99a94ace133c95e48909e5d
- v4.6: https://github.com/ibexa/post-install/commit/ae7c3c2081a862c75b90828f08bd74436ceb8fe8
Workarounds
Make sure HTTP compression is disabled for REST API requests and other communication that might contain secrets.
References
- Advisory: https://developers.ibexa.co/security-advisories/ibexa-sa-2024-006-vulnerabilities-in-content-name-pattern-commerce-shop-and-varnish-vhost-templates
- Release notes v3.3: https://doc.ibexa.co/en/latest/update_and_migration/from_3.3/update_from_3.3/#v3341
- Release notes v4.6: https://doc.ibexa.co/en/latest/update_and_migration/from_4.6/update_from_4.6/#v4614
- https://github.com/ezsystems/ezplatform-http-cache/security/advisories/GHSA-mgfg-7533-7jf6
- https://github.com/ibexa/http-cache/security/advisories/GHSA-fh7v-q458-7vmw
- https://www.breachattack.com/
Which versions are affected by GHSA-4h8f-c635-25p7?
4 open source packages ship an affected version, including ibexa/post-install.
| Package | Affected | Fixed in |
|---|---|---|
ibexa/post-install Packagist | From 1.0.0 | 1.0.16 |
ibexa/post-install Packagist | From 1.0.0 | 1.0.16 |
ibexa/post-install Packagist | From 4.6.0 | 4.6.14 |
ibexa/post-install Packagist | From 4.6.0 | 4.6.14 |
How do I fix GHSA-4h8f-c635-25p7?
Upgrade ibexa/post-install to a fixed version for your release line: 1.0.16 or 4.6.14.
Is GHSA-4h8f-c635-25p7 being exploited?
There is no known exploitation of GHSA-4h8f-c635-25p7 in the wild and no public exploit code.