full-disclosure - Re: [FD] Buffer overflow in xls2csv (xlsparse.c:716)

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Date: Mon, 14 May 2018 09:25:47 +0300
From: Vadim Zhukov <persgray@...il.com>
To: Mohd Hanafie <nafiez.skins@...il.com>
Cc: fulldisclosure@...lists.org
Subject: Re: [FD] Buffer overflow in xls2csv (xlsparse.c:716) - catdoc

It seems the Git repo you've mentioned isn't an official repo at all.

The actual home page of this project is this:
http://www.wagner.pp.ru/~vitus/software/catdoc/
--
  WBR,
  Vadim Zhukov

2018-05-14 7:47 GMT+03:00 Mohd Hanafie <nafiez.skins@...il.com>:
> 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).
>
>
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