USN-5090-2: Apache HTTP Server vulnerabilities
27 September 2021
Several security issues were fixed in Apache HTTP Server.
Releases
Packages
- apache2 - Apache HTTP server
Details
USN-5090-1 fixed several vulnerabilities in Apache. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory details:
It was discovered that the Apache HTTP Server incorrectly handled certain
malformed requests. A remote attacker could possibly use this issue to
cause the server to crash, resulting in a denial of service.
(CVE-2021-34798)
It was discovered that the Apache HTTP Server incorrectly handled escaping
quotes. If the server was configured with third-party modules, a remote
attacker could use this issue to cause the server to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2021-39275)
It was discovered that the Apache mod_proxy module incorrectly handled
certain request uri-paths. A remote attacker could possibly use this issue
to cause the server to forward requests to arbitrary origin servers.
(CVE-2021-40438)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 16.04
-
apache2
-
2.4.18-2ubuntu3.17+esm2
Available with Ubuntu Pro
-
apache2-bin
-
2.4.18-2ubuntu3.17+esm2
Available with Ubuntu Pro
Ubuntu 14.04
-
apache2
-
2.4.7-1ubuntu4.22+esm2
Available with Ubuntu Pro
-
apache2-bin
-
2.4.7-1ubuntu4.22+esm2
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References
Related notices
- USN-5090-1: apache2-dev, apache2-bin, apache2, apache2-utils, libapache2-mod-md, libapache2-mod-proxy-uwsgi, apache2-doc, apache2-ssl-dev, apache2-data, apache2-suexec-custom, apache2-suexec-pristine