USN-5090-1: Apache HTTP Server vulnerabilities
27 September 2021
Several security issues were fixed in Apache HTTP Server.
Releases
Packages
- apache2 - Apache HTTP server
Details
James Kettle discovered that the Apache HTTP Server HTTP/2 module
incorrectly handled certain crafted methods. A remote attacker could
possibly use this issue to perform request splitting or cache poisoning
attacks. (CVE-2021-33193)
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)
Li Zhi Xin discovered that the Apache mod_proxy_uwsgi module incorrectly
handled certain request uri-paths. A remote attacker could possibly use
this issue to cause the server to crash, resulting in a denial of service.
This issue only affected Ubuntu 20.04 LTS and Ubuntu 21.04.
(CVE-2021-36160)
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 21.04
Ubuntu 20.04
Ubuntu 18.04
In general, a standard system update will make all the necessary changes.
Related notices
- USN-5090-2: apache2-suexec, apache2-bin, apache2-mpm-event, apache2-dev, apache2-mpm-itk, apache2-mpm-worker, apache2-utils, apache2.2-bin, apache2-suexec-pristine, libapache2-mod-macro, libapache2-mod-proxy-html, apache2-mpm-prefork, apache2-suexec-custom, apache2-data, apache2-doc, apache2