The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learningUpgrade github.com/weaveworks/weave
to version 2.6.3 or higher.
github.com/weaveworks/weave is a package that provides simple, resilient multi-host containers networking.
Affected versions of this package are vulnerable to Arbitrary Code Execution. An attacker able to run a process as root in a container is able to respond to DNS requests from the host and thereby insert themselves as a fake service. In a cluster with an IPv4 internal network, if IPv6 is not disabled on the host (via ipv6.disable=1
on the kernel command line), it will be either unconfigured or configured on some interfaces, but it's pretty likely that ipv6 forwarding is disabled, ie /proc/sys/net/ipv6/conf//forwarding == 0
.
Also by default, /proc/sys/net/ipv6/conf/accept_ra == 1
. The combination of these 2 sysctls means that the host accepts router advertisements and configure the IPv6 stack using them.By sending rogue router advertisements, an attacker can reconfigure the host to redirect part or all of the IPv6 traffic of the host to the attacker controlled container. Even if there was no IPv6 traffic before, if the DNS returns A (IPv4) and AAAA (IPv6) records, many HTTP libraries will try to connect via IPv6 first then fallback to IPv4, giving an opportunity to the attacker to respond. A combination with the existence of CVE-2019-3462 on the host can allow escalation to the host. Weave Net version 2.6.3 disables the accept_ra
option on the veth devices that it creates.