Ubuntu 14.04 LTS / 16.04 LTS / 16.10 : apache2 vulnerabilities (USN-3279-1)
Medium Nessus Plugin ID 100098
Synopsis
The remote Ubuntu host is missing a security-related patch.
Description
It was discovered that the Apache mod_session_crypto module was encrypting data and cookies using either CBC or ECB modes. A remote attacker could possibly use this issue to perform padding oracle attacks. (CVE-2016-0736)
Maksim Malyutin discovered that the Apache mod_auth_digest module incorrectly handled malicious input. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. (CVE-2016-2161)
David Dennerline and Regis Leroy discovered that the Apache HTTP Server incorrectly handled unusual whitespace when parsing requests, contrary to specifications. When being used in combination with a proxy or backend server, a remote attacker could possibly use this issue to perform an injection attack and pollute cache. This update may introduce compatibility issues with clients that do not strictly follow HTTP protocol specifications. A new configuration option 'HttpProtocolOptions Unsafe' can be used to revert to the previous unsafe behaviour in problematic environments. (CVE-2016-8743).
Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
Solution
Update the affected apache2-bin package.