Test ID:	1.3.6.1.4.1.25623.1.0.148622
Category:	Denial of Service
Title:	OpenWRT < 19.07.7 DoS Vulnerability
Summary:	OpenWRT is prone to a denial of service (DoS) vulnerability.
Description:	Summary: OpenWRT is prone to a denial of service (DoS) vulnerability. Vulnerability Insight: In case a link prefix route points to a point-to-point link it can trigger a routing loop if the destination IPv6 address belongs to the prefix and is not a local IPv6 address. If such a packet is received and not directed to a local IPv6 address it will be routed back to the point-to-point link due to the link prefix route, the upstream ISP router will in its turn route the IPv6 packet back due to the assigned prefix route creating a 'ping pong' effect. The possible routing loop on point-to-point links (e.g PPP) can happen when router advertisements are received having at least one global unique IPv6 prefix for which the on-link flag is set. The WAN interface is assigned the global unique prefix (e.g. 2001:db8:1:0::/64) from which an IPv6 address is picked which will be installed on the wan interface (e.g. 2001:db8:1:0:5054:ff:feab:d87c/64). As the on-link flag is set the prefix route 2001:db8:1::/64 will be present in the routing table which will route any packet with as destination 2001:db8:1::/64 to the WAN interface and will be routed back by the upstream router due to the WAN interface having been assigned the global unique prefix. Besides not installing the prefix route 2001:db8:1::/64 on point-to-point links adding an unreachable route is required to avoid the routing loop. Affected Software/OS: OpenWRT version 19.07.6 and prior. Solution: Update to version 19.07.7 or later. CVSS Score: 3.3 CVSS Vector: AV:A/AC:L/Au:N/C:N/I:N/A:P
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2021-22161
Copyright	Copyright (C) 2022 Greenbone Networks GmbH

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