Arch Linux Security Advisory ASA-201901-14 ========================================== Severity: High Date : 2019-01-24 CVE-ID : CVE-2018-17189 CVE-2018-17199 CVE-2019-0190 Package : apache Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-857 Summary ======= The package apache before version 2.4.38-1 is vulnerable to multiple issues including denial of service and insufficient validation. Resolution ========== Upgrade to 2.4.38-1. # pacman -Syu "apache>=2.4.38-1" The problems have been fixed upstream in version 2.4.38. Workaround ========== - CVE-2018-17189 Disable the h2 protocol. Description =========== - CVE-2018-17189 (denial of service) By sending request bodies in a slow loris way to plain resources, the h2 stream of Apache HTTP Server before 2.4.38 for that request unnecessarily occupied a server thread cleaning up that incoming data. This affects only HTTP/2 connections. A possible mitigation is to not enable the h2 protocol. - CVE-2018-17199 (insufficient validation) In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before decoding the session. This causes session expiry time to be ignored for mod_session_cookie sessions since the expiry time is loaded when the session is decoded. - CVE-2019-0190 (denial of service) A bug exists in the way mod_ssl handled client renegotiations. A remote attacker could send a carefully crafted request that would cause mod_ssl to enter a loop leading to a denial of service. This bug can be only triggered with Apache HTTP Server version 2.4.37 when using OpenSSL version 1.1.1 or later, due to an interaction in changes to handling of renegotiation attempts. Impact ====== An attacker is able to crash the Apache server by sending maliciously- crafted h2 requests and SSL handshakes. In addition, an attacker is able to reuse an expired session. References ========== https://httpd.apache.org/security/vulnerabilities_24.html#2.4.38 https://security.archlinux.org/CVE-2018-17189 https://security.archlinux.org/CVE-2018-17199 https://security.archlinux.org/CVE-2019-0190