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[Bug binutils/26241] New: Heap overwrite in bits/string3


From: featherrain26 at gmail dot com
Subject: [Bug binutils/26241] New: Heap overwrite in bits/string3
Date: Tue, 14 Jul 2020 13:28:10 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=26241

            Bug ID: 26241
           Summary: Heap overwrite in bits/string3
           Product: binutils
           Version: 2.36 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: featherrain26 at gmail dot com
  Target Milestone: ---

Created attachment 12700
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12700&action=edit
POC input

Hi, there.

There is a heap overflow in the newest version of Binutils, libbfd.c

To reproduce,
run 
nm-new -C -a -l --synthetic poc 

Here is the trace reported by ASAN:
=================================================================
==8125==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62700001bfc8
at pc 0x7f800e15dc4c bp 0x7fffc72c76e0 sp 0x7fffc72c6e88
WRITE of size 40 at 0x62700001bfc8 thread T0
    #0 0x7f800e15dc4b in __asan_memset
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x8cc4b)
    #1 0x7c7375 in memset /usr/include/x86_64-linux-gnu/bits/string3.h:90
    #2 0x7c7375 in _bfd_pex64i_swap_aux_in
/mnt/data/playground/binutils-gdb/build/bfd/peXXigen.c:299
    #3 0x7857f2 in coff_get_normalized_symtab ../../bfd/coffgen.c:1830
    #4 0x7a4e04 in coff_slurp_symbol_table ../../bfd/coffcode.h:4494
    #5 0x770538 in coff_get_symtab_upper_bound ../../bfd/coffgen.c:411
    #6 0x47a425 in _bfd_generic_read_minisymbols ../../bfd/syms.c:802
    #7 0x40e9fd in display_rel_file ../../binutils/nm.c:1126
    #8 0x4123cb in display_file ../../binutils/nm.c:1393
    #9 0x407e93 in main ../../binutils/nm.c:1874
    #10 0x7f800db2382f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #11 0x409e98 in _start
(/mnt/data/playground/binutils-gdb/build/binutils/nm-new+0x409e98)

0x62700001bfc8 is located 8 bytes to the right of 14016-byte region
[0x627000018900,0x62700001bfc0)
allocated by thread T0 here:
    #0 0x7f800e169662 in malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98662)
    #1 0x9471cc in _objalloc_alloc ../../libiberty/objalloc.c:143

SUMMARY: AddressSanitizer: heap-buffer-overflow ??:0 __asan_memset
Shadow bytes around the buggy address:
  0x0c4e7fffb7a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4e7fffb7b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4e7fffb7c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4e7fffb7d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c4e7fffb7e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c4e7fffb7f0: 00 00 00 00 00 00 00 00 fa[fa]fa fa fa fa fa fa
  0x0c4e7fffb800: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4e7fffb810: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4e7fffb820: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4e7fffb830: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c4e7fffb840: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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
==8125==ABORTING

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