- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202012-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: HAProxy: Arbitrary code execution Date: December 24, 2020 Bugs: #715944 ID: 202012-22 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A buffer overflow in HAProxy might allow an attacker to execute arbitrary code. Background ========== HAProxy is a TCP/HTTP reverse proxy for high availability environments. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-proxy/haproxy < 2.1.4 >= 2.0.13:0/2.0 >= 2.1.4 Description =========== It was discovered that HAProxy incorrectly handled certain HTTP/2 headers. Impact ====== A remote attacker, by sending a specially crafted HTTP/2 request, could possibly execute arbitrary code with the privileges of the process, or cause a Denial of Service condition. Workaround ========== Disable HTTP/2 support. Resolution ========== All HAProxy 2.0.x users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-proxy/haproxy-2.0.13:0/2.0" All other HAProxy users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-proxy/haproxy-2.1.4" References ========== [ 1 ] CVE-2020-11100 https://nvd.nist.gov/vuln/detail/CVE-2020-11100 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202012-22 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2020 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5