SB2017070625 - Input validation error in ipsec-tools.sourceforge.net IPsec-Tools

Description

This security bulletin contains information about 1 vulnerability.

1) Input validation error (CVE-ID: CVE-2016-10396)

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The racoon daemon in IPsec-Tools 0.8.2 contains a remotely exploitable computational-complexity attack when parsing and storing ISAKMP fragments. The implementation permits a remote attacker to exhaust computational resources on the remote endpoint by repeatedly sending ISAKMP fragment packets in a particular order such that the worst-case computational complexity is realized in the algorithm utilized to determine if reassembly of the fragments can take place.

Remediation

Install update from vendor's website.

References

• http://cvsweb.netbsd.org/bsdweb.cgi/src/crypto/dist/ipsec-tools/src/racoon/isakmp_frag.c.diff?r1=1.5&r2=1.5.36.1
• http://cvsweb.netbsd.org/bsdweb.cgi/src/crypto/dist/ipsec-tools/src/racoon/isakmp_frag.c?only_with_tag=MAIN
• https://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=51682