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high7.5

CVE-2021-31618

Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used …

Impact

Apache HTTP Server protocol handler for the HTTP/2 protocol checks received request headers against the size limitations as configured for the server and used for the HTTP/1 protocol as well. On violation of these restrictions and HTTP response is sent to the client with a status code indicating why the request was rejected. This rejection response was not fully initialised in the HTTP/2 protocol handler if the offending header was the very first one received or appeared in a a footer. This led to a NULL pointer dereference on initialised memory, crashing reliably the child process. Since such a triggering HTTP/2 request is easy to craft and submit, this can be exploited to DoS the server. This issue affected mod_http2 1.15.17 and Apache HTTP Server version 2.4.47 only. Apache HTTP Server 2.4.47 was never released.

Affected products

VendorProductAffected versions
ApacheHttp Server
Versions 1.15.17, 2.4.47
FedoraprojectFedora
Versions 33, 34
DebianDebian Linux
Versions 9.0, 10.0
OracleEnterprise Manager Ops Center
Version 12.4.0.0
OracleInstantis Enterprisetrack
Versions 17.1, 17.2, 17.3
OracleZfs Storage Appliance Kit
Version 8.8

Weakness classification

CWE-476

References