USN-5090-2: Apache HTTP Server vulnerabilities
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Ubuntu Security Notice USN-5090-2
September 27, 2021
apache2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM
Summary:
Several security issues were fixed in Apache HTTP Server.
Software Description:
- 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 ESM:
apache2 2.4.18-2ubuntu3.17+esm2
apache2-bin 2.4.18-2ubuntu3.17+esm2
Ubuntu 14.04 ESM:
apache2 2.4.7-1ubuntu4.22+esm2
apache2-bin 2.4.7-1ubuntu4.22+esm2
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5090-2
https://ubuntu.com/security/notices/USN-5090-1
CVE-2021-34798, CVE-2021-39275, CVE-2021-40438
An Apache HTTP Server security update has been released for Ubuntu Linux 14.04 ESM and 16.04 ESM.
