Heap-buffer-overflow-GString-getLength

[Aurorainfinity]

./pdftohtml 02-Heap-buffer-overflow-GString-getLength.pdf

==86439==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000016e30 at pc 0x000000413f33 bp 0x7fff777ada30 sp 0x7fff777ada20
READ of size 4 at 0x602000016e30 thread T0
    #0 0x413f32 in GString::getLength() ../goo/GString.h:50
    #1 0x4a6132 in GString::GString(GString*) (/home/test/pdftohtml_tmp/src/pdftohtml+0x4a6132)
    #2 0x410ae7 in HtmlOutputDev::newOutlineLevel(_IO_FILE*, Object*, Catalog*, int) /home/test/pdftohtml_tmp/src/HtmlOutputDev.cc:1947
    #3 0x410808 in HtmlOutputDev::dumpDocOutline(Catalog*) /home/test/pdftohtml_tmp/src/HtmlOutputDev.cc:1916
    #4 0x41ce3c in main /home/test/pdftohtml_tmp/src/pdftohtml.cc:303
    #5 0x7f2f38afc83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #6 0x4028a8 in _start (/home/test/pdftohtml_tmp/src/pdftohtml+0x4028a8)

0x602000016e32 is located 0 bytes to the right of 2-byte region [0x602000016e30,0x602000016e32)
allocated by thread T0 here:
    #0 0x7f2f397df602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x4a7bb6 in gmalloc (/home/test/pdftohtml_tmp/src/pdftohtml+0x4a7bb6)
    #2 0x4a7dce in copyString (/home/test/pdftohtml_tmp/src/pdftohtml+0x4a7dce)
    #3 0x43c709 in Object::copy(Object*) /home/test/pdftohtml_tmp/xpdf/Object.cc:93
    #4 0x43c776 in Object::fetch(XRef*, Object*) /home/test/pdftohtml_tmp/xpdf/Object.cc:106
    #5 0x41faa7 in Dict::lookup(char*, Object*) /home/test/pdftohtml_tmp/xpdf/Dict.cc:76
    #6 0x41447f in Object::dictLookup(char*, Object*) (/home/test/pdftohtml_tmp/src/pdftohtml+0x41447f)
    #7 0x410a9e in HtmlOutputDev::newOutlineLevel(_IO_FILE*, Object*, Catalog*, int) /home/test/pdftohtml_tmp/src/HtmlOutputDev.cc:1943
    #8 0x410808 in HtmlOutputDev::dumpDocOutline(Catalog*) /home/test/pdftohtml_tmp/src/HtmlOutputDev.cc:1916
    #9 0x41ce3c in main /home/test/pdftohtml_tmp/src/pdftohtml.cc:303
    #10 0x7f2f38afc83f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)

SUMMARY: AddressSanitizer: heap-buffer-overflow ../goo/GString.h:50 GString::getLength()
Shadow bytes around the buggy address:
  0x0c047fffad70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fffad80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fffad90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fffada0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fffadb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c047fffadc0: fa fa 00 00 fa fa[02]fa fa fa fd fd fa fa fd fd
  0x0c047fffadd0: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c047fffade0: fa fa fd fa fa fa fd fa fa fa fd fd fa fa fd fa
  0x0c047fffadf0: fa fa fd fd fa fa fd fa fa fa fd fd fa fa fd fa
  0x0c047fffae00: fa fa fd fa fa fa fd fd fa fa fd fa fa fa fd fa
  0x0c047fffae10: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
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
==86439==ABORTING

ref:https://github.com/Aurorainfinity/Poc/tree/master/pdftohtml
02-Heap-buffer-overflow-GString-getLength.pdf