In Apache HTTP Server versions 2.4.20 to 2.4.43, a specially crafted value for the ‘Cache-Digest’ header in a HTTP/2 request would result in a crash when the server actually tries to HTTP/2 PUSH a resource afterwards. Configuring the HTTP/2 feature via “H2Push off” will mitigate this vulnerability for unpatched servers.
Acknowledgements: Felix Wilhelm of Google Project Zero
- Link to vendor - https://httpd.apache.org/security/vulnerabilities_24.html
- CVE - http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-9490