Heap-buffer-overflow in ms_escher_get_data on a fuzzed xls file.

Git versions of glib, goffice, gnumeric, libgsf and libxml2.

Test case: http://jutaky.com/fuzzing/gnumeric_case_29042_81071.xls

I requested a CVE identifier for this one: CVE-2013-6836.

==21670== ERROR: AddressSanitizer: heap-buffer-overflow on address 0x600400200465 at pc 0x7f137e5addc1 bp 0x7fff82df2a30 sp 0x7fff82df2a28
WRITE of size 1 at 0x600400200465 thread T0
    #0 0x7f137e5addc0 in ms_escher_get_data /gnumeric/plugins/excel/ms-escher.c:245
    #1 0x7f137e5b9c25 in ms_escher_read_container /gnumeric/plugins/excel/ms-escher.c:2075
    #2 0x7f137e5b88b1 in ms_escher_read_DgContainer /gnumeric/plugins/excel/ms-escher.c:1989
    #3 0x7f137e5bb058 in ms_escher_read_container /gnumeric/plugins/excel/ms-escher.c:2152
    #4 0x7f137e5bbd74 in ms_escher_parse /gnumeric/plugins/excel/ms-escher.c:2219
    #5 0x7f137e61bdd2 in excel_read_sheet /gnumeric/plugins/excel/ms-excel-read.c:6704
    #6 0x7f137e61f7f8 in excel_read_BOF /gnumeric/plugins/excel/ms-excel-read.c:6996
    #7 0x7f137e620ea6 in excel_read_workbook /gnumeric/plugins/excel/ms-excel-read.c:7086
    #8 0x7f137e596c2c in excel_enc_file_open /gnumeric/plugins/excel/boot.c:193
    #9 0x7f137e5978ca in excel_file_open /gnumeric/plugins/excel/boot.c:250
    #10 0x7f13a002800e in go_plugin_loader_module_func_file_open /goffice/goffice/app/go-plugin-loader-module.c:282
    #11 0x7f13a0030f70 in go_plugin_file_opener_open /goffice/goffice/app/go-plugin-service.c:685 (discriminator 1)
    #12 0x7f13a003d8bf in go_file_opener_open /goffice/goffice/app/file.c:417
    #13 0x7f13a1193684 in workbook_view_new_from_input /gnumeric/src/workbook-view.c:1281
    #14 0x7f13a1193e73 in workbook_view_new_from_uri /gnumeric/src/workbook-view.c:1341
    #15 0x40a6e0 in main /gnumeric/src/main-application.c:322
    #16 0x7f139b91bbc4 in __libc_start_main ??:?
    #17 0x403de8 in _start ??:?
0x600400200465 is located 11 bytes to the left of 16-byte region [0x600400200470,0x600400200480)


--
Juha Kylmänen
Research Assistant, OUSPG