September 27, 2020

Apache HTTP Server 2.4.46 releases: fix multi security vulnerabilities

3 min read

Apache HTTP Server (Apache) is an open source web server for the Apache Software Foundation that runs on most computer operating systems because of its multi-platform and security being used by the most popular Web server software one. It is fast, reliable, and can be compiled with Perl/Python and other interpreters into the server through a simple API extension.

Apache Pulsar

Apache HTTP Server 2.4.46 has been released.


*) SECURITY: CVE-2020-11984 (
mod_proxy_uwsgi: Malicious request may result in information disclosure
or RCE of existing file on the server running under a malicious process
environment. [Yann Ylavic]

*) SECURITY: CVE-2020-11993 (
mod_http2: when throttling connection requests, log statements
where possibly made that result in concurrent, unsafe use of
a memory pool. [Stefan Eissing]

mod_http2: a specially crafted value for the ‘Cache-Digest’ header
request would result in a crash when the server actually tries
to HTTP/2 PUSH a resource afterwards.
[Stefen Eissing, Eric Covener, Christophe Jaillet]

*) mod_proxy_fcgi: Fix build warnings for Windows platform

Changes with Apache 2.4.45

*) mod_http2: remove support for abandoned http-wg draft
[Stefan Eissing]

Changes with Apache 2.4.44

*) mod_proxy_uwsgi: Error out on HTTP header larger than 16K (hard
protocol limit). [Yann Ylavic]

*) mod_http2:
Fixes <>:
“LimitRequestFields 0” now disables the limit, as documented.
Fixes <>:
Do not count repeated headers with same name against the field
count limit. The are merged internally, as if sent in a single HTTP/1 line.
[Stefan Eissing]

*) mod_http2: Avoid segfaults in case of handling certain responses for
already aborted connections. [Stefan Eissing, Ruediger Pluem]

*) mod_http2: The module now handles master/secondary connections and has marked
methods according to use. [Stefan Eissing]

*) core: Drop an invalid Last-Modified header value coming
from a FCGI/CGI script instead of replacing it with Unix epoch.
[Yann Ylavic, Luca Toscano]

*) Add support for strict content-length parsing through addition of
ap_parse_strict_length() [Yann Ylavic]

*) mod_proxy_fcgi: ProxyFCGISetEnvIf unsets variables when expression
evaluates to false. PR64365. [Michael König <mail>]

*) mod_proxy_http: flush spooled request body in one go to avoid
leaking (or long lived) temporary file. PR 64452. [Yann Ylavic]

*) mod_ssl: Fix a race condition and possible crash when using a proxy client
certificate (SSLProxyMachineCertificateFile).
[Armin Abfalterer <a.abfalterer>]

*) mod_ssl: Fix memory leak in stapling code. PR63687. [Stefan Eissing]

*) mod_http2: Fixed regression that no longer set H2_STREAM_ID and H2_STREAM_TAG.
PR64330 [Stefan Eissing]

*) mod_http2: Fixed regression that caused connections to close when mod_reqtimeout
was configured with a handshake timeout. Fixes gitub issue #196.
[Stefan Eissing]

*) mod_proxy_http2: the “ping” proxy parameter
(see <>) is now used
when checking the liveliness of a new or reused h2 connection to the backend.
With short durations, this makes load-balancing more responsive. The module
will hold back requests until ping conditions are met, using features of the
HTTP/2 protocol alone. [Ruediger Pluem, Stefan Eissing]

*) core: httpd is no longer linked against -lsystemd if mod_systemd
is enabled (and built as a DSO). [Rainer Jung]

*) mod_proxy_http2: respect ProxyTimeout settings on backend connections
while waiting on incoming data. [Ruediger Pluem, Stefan Eissing]