Wireshark 1.12.0 < 1.12.12 / 2.0.0 < 2.0.4 - PacketBB Dissector Denial of Service

EDB-ID:

40197




Platform:

Multiple

Date:

2016-08-03


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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


Proof of Concept:
https://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/40197.zip