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This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version", "A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well."], "mitigation": {"lang": "en:us", "value": "The mitigation is to disable ICMP destination unreachable messages.\nThe commands to disable UDP port unreachable ICMP reply messages:\niptables -I OUTPUT -p icmp --icmp-type destination-unreachable -j DROP\nservice iptables save\nFor additional information about \"service iptables save\" please read https://access.redhat.com/solutions/1597703\nIt is not recommended to apply this rule if host being used as forwarder (router) of IP packets.\nOr it is possible to use this firewall-cmd instead of iptables and the result is similar:\nfirewall-cmd --permanent --direct --add-rule ipv4 filter OUTPUT 0 -p icmp --icmp-type destination-unreachable -j DROP"}, "name": "CVE-2020-25705", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2020-11-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2020-25705\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-25705"], "statement": "This issue is rated as having Moderate impact because of the attack scenario limitation. It is possible to harm the networking services only, but not for the overall system under attack, and impossible to get access to this remote system under attack.", "threat_severity": "Moderate"}