7.8 - USN-4113-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Apache.

Software Description: - apache2: Apache HTTP server

Details:

Stefan Eissing discovered that the HTTP/2 implementation in Apache did not properly handle upgrade requests from HTTP/1.1 to HTTP/2 in some situations. A remote attacker could use this to cause a denial of service (daemon crash). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-0197)

Craig Young discovered that a memory overwrite error existed in Apache when performing HTTP/2 very early pushes in some situations. A remote attacker could use this to cause a denial of service (daemon crash). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10081)

Craig Young discovered that a read-after-free error existed in the HTTP/2 implementation in Apache during connection shutdown. A remote attacker could use this to possibly cause a denial of service (daemon crash) or possibly expose sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10082)

Matei Badanoiu discovered that the mod_proxy component of Apache did not properly filter URLs when reporting errors in some configurations. A remote attacker could possibly use this issue to conduct cross-site scripting (XSS) attacks. (CVE-2019-10092)

Daniel McCarney discovered that mod_remoteip component of Apache contained a stack buffer overflow when parsing headers from a trusted intermediary proxy in some situations. A remote attacker controlling a trusted proxy could use this to cause a denial of service or possibly execute arbitrary code. This issue only affected Ubuntu 19.04. (CVE-2019-10097)

Yukitsugu Sasaki discovered that the mod_rewrite component in Apache was vulnerable to open redirects in some situations. A remote attacker could use this to possibly expose sensitive information or bypass intended restrictions. (CVE-2019-10098)

Jonathan Looney discovered that the HTTP/2 implementation in Apache did not properly limit the amount of buffering for client connections in some situations. A remote attacker could use this to cause a denial of service (unresponsive daemon). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-9517)

Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 19.04:
apache2 2.4.38-2ubuntu2.2
apache2-bin 2.4.38-2ubuntu2.2

Ubuntu 18.04 LTS:
apache2 2.4.29-1ubuntu4.10
apache2-bin 2.4.29-1ubuntu4.10

Ubuntu 16.04 LTS:
apache2 2.4.18-2ubuntu3.12
apache2-bin 2.4.18-2ubuntu3.12

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/4113-1
CVE-2019-0197, CVE-2019-10081, CVE-2019-10082, CVE-2019-10092,
CVE-2019-10097, CVE-2019-10098, CVE-2019-9517

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.38-2ubuntu2.2
https://launchpad.net/ubuntu/+source/apache2/2.4.29-1ubuntu4.10
https://launchpad.net/ubuntu/+source/apache2/2.4.18-2ubuntu3.12