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Gentoo: GLSA-202105-20 Low: Dnsmasq DNS Cache Poisoning

Use of insufficient randomness in Dnsmasq might lead to DNS Cache Poisoning.. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202105-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Low Title: Dnsmasq: DNS cache poisoning Date: May 26, 2021 Bugs: #782130 ID: 202105-20 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= Use of insufficient randomness in Dnsmasq might lead to DNS Cache Poisoning. Background ========= Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP server. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/dnsmasq < 2.85 > = 2.85 Description ========== It was discovered that Dnsmasq, when configured with --server= @ or similar (e.g. through dbus), configured a fixed UDP port for all outgoing queries to the specified upstream DNS server. Impact ===== An attacker, by sending malicious crafted DNS responses, could perform a DNS Cache Poisoning attack. Workaround ========= There is no known workaround at this time. Resolution ========= All Dnsmasq users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =net-dns/dnsmasq-2.85" References ========= [ 1 ] CVE-2021-3448 https://nvd.nist.gov/vuln/detail/CVE-2021-3448 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202105-20 Concerns? ======== Security is a primary focus of Gentoo Linux andensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2021 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/ . Explore the Gentoo Security Advisory GLSA 202105-20 which outlines a minor severity DNS cache poisoning vulnerability found in Dnsmasq, along with recommended mitigation steps.. Dnsmasq Security,Gentoo Advisory,DNS Threat. . Severity: Low. LinuxSecurity.com Team

May 26, 2021 •Low Gentoo