Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 12577] New: Divide-by-zero error in dissect_pbb_tlvblock()

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Bug ID	12577
Summary	Divide-by-zero error in dissect_pbb_tlvblock()
Product	Wireshark
Version	2.0.4
Hardware	x86-64
OS	All
Status	UNCONFIRMED
Severity	Minor
Priority	Low
Component	Dissection engine (libwireshark)
Assignee	bugzilla-admin@wireshark.org
Reporter	c.benedict@prometheuscomputing.com

Created attachment 14696 [details]
Sample generated by AFL

Build Information:
TShark 1.12.9 (v1.12.9-0-gfadb421 from (HEAD)

Copyright 1998-2015 Gerald Combs <gerald@wireshark.org> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Compiled (64-bit) with GLib 2.48.1, with libpcap, with libz 1.2.8, with POSIX
capabilities (Linux), with libnl 3, without SMI, with c-ares 1.11.0, without
Lua, without Python, with GnuTLS 3.4.13, with Gcrypt 1.7.1, with MIT Kerberos,
with GeoIP.

Running on Linux 4.6.2-1-ARCH, with locale en_US.utf8, with libpcap version
1.7.4, with libz 1.2.8.
       Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
--
This issue was uncovered with AFL (http://lcamtuf.coredump.cx/afl/)

The attached sample evokes a divide-by-zero error in the dissect_pbb_tlvblock()
function at packet-packetbb.c:289.

The variable of interest seems to be 'c' which is set at packet-packetbb.c:285
using two other variables and an addition. When c is zero, the _expression_
"length/c" at packet-packetbb.c:289 results in a divide-by-zero error.

Divide-by-zero has been observed when sample is parsed by tshark versions
1.12.8, 1.12.9, 1.12.10, 1.12.12, and 2.0.4 among others.

Credit goes to Chris Benedict, Aurelien Delaitre, NIST SAMATE Project,
https://samate.nist.gov

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