The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in Apple iOS before 9 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.

References

• https://nvd.nist.gov/vuln/detail/CVE-2015-5869
• https://support.apple.com/HT205212
• https://support.apple.com/HT205213
• https://support.apple.com/HT205267
• http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
• http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
• http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
• http://openwall.com/lists/oss-security/2015/04/04/2
• http://www.securityfocus.com/bid/76764
• http://www.securitytracker.com/id/1033609