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.
| Vulnerable Product | Search on Vulmon | Subscribe to Product |
|---|---|---|
apache http server 1.15.17 |
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apache http server 2.4.47 |
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fedoraproject fedora 33 |
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fedoraproject fedora 34 |
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debian debian linux 9.0 |
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debian debian linux 10.0 |
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oracle instantis enterprisetrack 17.1 |
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oracle instantis enterprisetrack 17.2 |
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oracle instantis enterprisetrack 17.3 |
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oracle enterprise manager ops center 12.4.0.0 |
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oracle zfs storage appliance kit 8.8 |
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