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Date: Mon, 14 May 2018 12:47:31 +0800
From: Mohd Hanafie <nafiez.skins@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Buffer overflow in xls2csv (xlsparse.c:716) - catdoc

Buffer overflow found in xls2csv (catdoc). Originally reported here
https://github.com/petewarden/catdoc/issues/ however, the git seems no
longer maintained.

==32764==ERROR: AddressSanitizer: global-buffer-overflow on address
0x08071990 at pc 0x08050bc2 bp 0xbf86a2c8 sp 0xbf86a2b8
READ of size 1 at 0x08071990 thread T0
    #0 0x8050bc1 in format_rk /home/john/catdoc/src/xlsparse.c:716
    #1 0x805290d in process_item /home/john/catdoc/src/xlsparse.c:325
    #2 0x8054206 in do_table /home/john/catdoc/src/xlsparse.c:116
    #3 0x804a7fb in main /home/john/catdoc/src/xls2csv.c:167
    #4 0xb776e636 in __libc_start_main
(/lib/i386-linux-gnu/libc.so.6+0x18636)
    #5 0x804b5db  (/usr/local/bin/xls2csv+0x804b5db)

0x08071990 is located 48 bytes to
=32764==ERROR: AddressSanitizer: global-buffer-overflow on address
0x08071990 at pc 0x08050bc2 bp 0xbf86a2c8 sp 0xbf86a2b8
READ of size 1 at 0x08071990 thread T0
    #0 0x8050bc1 in format_rk /home/john/catdoc/src/xlsparse.c:716
    #1 0x805290d in process_item /home/john/catdoc/src/xlsparse.c:325
    #2 0x8054206 in do_table /home/john/catdoc/src/xlsparse.c:116
    #3 0x804a7fb in main /home/john/catdoc/src/xls2csv.c:167
    #4 0xb776e636 in __libc_start_main
(/lib/i386-linux-gnu/libc.so.6+0x18636)
    #5 0x804b5db  (/usr/local/bin/xls2csv+0x804b5db)

0x08071990 is located 48 bytes to the left of global variable 'buffer'
defined in 'charsets.c:291:14' (0x80719c0) of size 7
0x08071990 is located 0 bytes to the right of global variable 'rec' defined
in 'xlsparse.c:22:22' (0x806d340) of size 18000
SUMMARY: AddressSanitizer: global-buffer-overflow
/home/john/catdoc/src/xlsparse.c:716 format_rk
Shadow bytes around the buggy address:
  0x2100e2e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x2100e2f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x2100e300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x2100e310: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x2100e320: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x2100e330: 00 00[f9]f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9
  0x2100e340: 04 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
  0x2100e350: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
  0x2100e360: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
  0x2100e370: 04 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
  0x2100e380: 04 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
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
==32764==ABORTING

Attached is the POC and work with latest version 0.95. It is found that
this bug affecting the version of catdoc_0.94.3~git20160113.dbc9ec6+dfsg-1_i386
in Ubuntu repo (latest version at least).

Download attachment "case15841.zip" of type "application/x-zip-compressed" (5198 bytes)


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