[Secure-testing-team] Bug#782107: kfreebsd-10: CVE-2015-2923: IPv6 Hop limit lowering via RA messages

[Steven Chamberlain]

Package: src:kfreebsd-10
Version: 10.1~svn274115-3
Severity: grave
Tags: security

Hi,

A local-network DoS was reported in the IPv6 stack of FreeBSD:
https://www.freebsd.org/security/advisories/FreeBSD-SA-15:09.ipv6.asc
(the same issue as CVE-2015-2922 on Linux).

This affects all our kfreebsd-8, -9, -10 and -11 packages.

Debian GNU/kFreeBSD packages enable "accept_rtadv" by default, so are
vulnerable to this DoS unless that flag is manually disabled on an
interface, or IPv6 connectivity not used.

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: kfreebsd-amd64 (x86_64)

Kernel: kFreeBSD 9.0-2-amd64-xenhvm-ipsec
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash