[Bug binutils/29799] New: A heap buffer overflow was fould in display_debug_section in binutils-2.40 (HEAD)

[15664243668 at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29799

            Bug ID: 29799
           Summary: A heap buffer overflow was fould in
                    display_debug_section in binutils-2.40 (HEAD)
           Product: binutils
           Version: 2.40 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: 15664243668 at 163 dot com
  Target Milestone: ---
             Flags: security?

Created attachment 14460
  --> https://sourceware.org/bugzilla/attachment.cgi?id=14460&action=edit
readelf poc file

Hi

There is a heap buffer overflow bug in binutils-2.40 (commit ab11c890).

The bug is triggered in display_debug_section() at binutils/readelf.c:16319
when parsing the debug sections of a malformed ELF file.

To reproduce this bug, use:

1. compile binutils-2.39 with clang-6.0 and address sanitizer:
```sh
./configure --disable-shared --disable-gdb --disable-werror
make
```

2. use readelf to process the PoC file (see attachment):
```sh
readelf -w ./poc2
```

The address sanitizer reports are as follows.
```
===
ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60e0000000e3 at pc
0x5555556ef069 bp 0x7fffffffe040 sp 0x7fffffffe030
READ of size 1 at 0x60e0000000e3 thread T0
    #0 0x5555556ef068 in byte_get_little_endian ../../binutils/elfcomm.c:118
    #1 0x5555556e88ff in display_gdb_index ../../binutils/dwarf.c:10548
    #2 0x55555567410a in display_debug_section ../../binutils/readelf.c:16319
    #3 0x555555674606 in process_section_contents
../../binutils/readelf.c:16415
    #4 0x55555569169e in process_object ../../binutils/readelf.c:22438
    #5 0x555555693930 in process_file ../../binutils/readelf.c:22861
    #6 0x555555693d8f in main ../../binutils/readelf.c:22932
    #7 0x7ffff6a48c86 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
    #8 0x55555561ba79 in _start
(/home/binutils-gdb/obj-asan/binutils/readelf+0xc7a79)

0x60e0000000e3 is located 10 bytes to the right of 153-byte region
[0x60e000000040,0x60e0000000d9)
allocated by thread T0 here:
    #0 0x7ffff6ef6b40 in __interceptor_malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb40)
    #1 0x555555627377 in get_data ../../binutils/readelf.c:498
    #2 0x555555672b0b in load_specific_debug_section
../../binutils/readelf.c:15940
    #3 0x5555556740ad in display_debug_section ../../binutils/readelf.c:16313
    #4 0x555555674606 in process_section_contents
../../binutils/readelf.c:16415
    #5 0x55555569169e in process_object ../../binutils/readelf.c:22438
    #6 0x555555693930 in process_file ../../binutils/readelf.c:22861
    #7 0x555555693d8f in main ../../binutils/readelf.c:22932
    #8 0x7ffff6a48c86 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21c86)

SUMMARY: AddressSanitizer: heap-buffer-overflow ../../binutils/elfcomm.c:118 in
byte_get_little_endian
Shadow bytes around the buggy address:
  0x0c1c7fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1c7fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1c7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1c7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1c7fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c1c7fff8010: 00 00 00 00 00 00 00 00 00 00 00 01[fa]fa fa fa
  0x0c1c7fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff8060: 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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
```

More detailed causes of this bug is to be analyzed.

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