Denial of Service in @podium/layout and @podium/proxy

Vulnerability Description

Podium is a library for building micro frontends. @podium/layout is a module for building a Podium layout server, and @podium/proxy is a module for proxying HTTP requests from a layout server to a podlet server. In @podium/layout prior to version 4.6.110 and @podium/proxy prior to version 4.2.74, an attacker using the `Trailer` header as part of the request against proxy endpoints has the ability to take down the server. All Podium layouts that include podlets with proxy endpoints are affected. `@podium/layout`, which is the main way developers/users are vulnerable to this exploit, has been patched in version `4.6.110`. All earlier versions are vulnerable.`@podium/proxy`, which is the source of the vulnerability and is used by `@podium/layout` has been patched in version `4.2.74`. All earlier versions are vulnerable. It is not easily possible to work around this issue without upgrading.

References

• https://github.com/podium-lib/proxy/security/advisories/GHSA-3hjg-vc7r-rcrw
• https://github.com/podium-lib/layout/commit/fe43e655432b0a5f07b6475f67babcc2588fb039
• https://github.com/podium-lib/proxy/commit/9698a40df081217ce142d4de71f929baaa339cdf
• https://github.com/podium-lib/layout/releases/tag/v4.6.110
• https://github.com/podium-lib/proxy/releases/tag/v4.2.74