The Linux kernel, when using IPv6, allows remote attackers to determine whether a host is sniffing the network by sending an ICMPv6 Echo Request to a multicast address and determining whether an Echo Reply is sent, as demonstrated by thcping. References: http://seclists.org/dailydave/2011/q2/25 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2010-4563
Statement: The Red Hat Security Response Team has rated this issue as having low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.