========================================================================== Ubuntu Security Notice USN-3937-2 April 10, 2019 apache2 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM Summary: Several security issues were fixed in Apache. Software Description: - apache2: Apache HTTP server Details: USN-3937-1 and USN-3627-1 fixed several vulnerabilities in Apache. This update provides the corresponding update for Ubuntu 12.04 ESM. Original advisory details: Simon Kappel discovered that the Apache HTTP Server mod_auth_digest module incorrectly handled threads. A remote attacker with valid credentials could possibly use this issue to authenticate using another username, bypassing access control restrictions. (CVE-2019-0217) Alex Nichols and Jakob Hirsch discovered that the Apache HTTP Server mod_authnz_ldap module incorrectly handled missing charset encoding headers. A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of service. (CVE-2017-15710) Robert Swiecki discovered that the Apache HTTP Server incorrectly handled certain requests. A remote attacker could possibly use this issue to cause the server to crash, leading to a denial of service. (CVE-2018-1301) Nicolas Daniels discovered that the Apache HTTP Server incorrectly generated the nonce when creating HTTP Digest authentication challenges. A remote attacker could possibly use this issue to replay HTTP requests across a cluster of servers. (CVE-2018-1312) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: apache2.2-bin 2.2.22-1ubuntu1.15 In general, a standard system update will make all the necessary changes. References: https://usn.ubuntu.com/usn/usn-3937-2 https://usn.ubuntu.com/usn/usn-3937-1 CVE-2017-15710, CVE-2018-1301, CVE-2018-1312, CVE-2019-0217