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List:       oss-security
Subject:    [oss-security] binutils: heap-based buffer overflow in read_1_byte (dwarf2.c)
From:       "Agostino Sarubbo" <ago () gentoo ! org>
Date:       2017-09-30 17:01:32
Message-ID: 13746.9387586577-sendEmail () localhost
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Description:
binutils is a set of tools necessary to build programs.

The complete ASan output of the issue:

# nm -A -a -l -S -s --special-syms --synthetic --with-symbol-versions -D $FILE
==3235==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x613000000512 at pc \
0x7f7c93ae3c88 bp 0x7ffe38d7a970 sp 0x7ffe38d7a968 READ of size 1 at 0x613000000512 thread T0
    #0 0x7f7c93ae3c87 in read_1_byte \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:616:10  #1 0x7f7c93ae3c87 \
in decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:2311  \
#2 0x7f7c93aee92b in comp_unit_maybe_decode_line_info \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3608:26  #3 0x7f7c93aee92b \
in comp_unit_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3643 \
#4 0x7f7c93aeb94f in _bfd_dwarf2_find_nearest_line \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4755:11  #5 0x7f7c93a2920b \
in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8694:10  \
#6 0x517c83 in print_symbol \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9  #7 0x51542d in \
print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7  #8 \
0x51542d in display_rel_file \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200  #9 0x510f56 in \
display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7  #10 \
0x50faae in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12  \
#11 0x7f7c9296e680 in __libc_start_main \
/var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289  #12 \
0x41ac18 in _init (/usr/x86_64-pc-linux-gnu/binutils-bin/git/nm+0x41ac18)

0x613000000512 is located 0 bytes to the right of 338-byte region \
[0x6130000003c0,0x613000000512) allocated by thread T0 here:
    #0 0x4d8e08 in malloc \
/var/tmp/portage/sys-libs/compiler-rt-sanitizers-5.0.0/work/compiler-rt-5.0.0.src/lib/asan/asan_malloc_linux.cc:67
  #1 0x7f7c9393a37c in bfd_malloc \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:193:9  #2 0x7f7c9392fb2f in \
bfd_get_full_section_contents \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/compress.c:248:21  #3 0x7f7c939696d3 \
in bfd_simple_get_relocated_section_contents \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/simple.c:193:12  #4 0x7f7c93ade26e \
in read_section /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:556:8  #5 \
0x7f7c93adef3c in decode_line_info \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:2047:9  #6 0x7f7c93aee92b \
in comp_unit_maybe_decode_line_info \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3608:26  #7 0x7f7c93aee92b \
in comp_unit_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3643 \
#8 0x7f7c93aeb94f in _bfd_dwarf2_find_nearest_line \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4755:11  #9 0x7f7c93a2920b \
in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8694:10  \
#10 0x517c83 in print_symbol \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9  #11 0x51542d in \
print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7  #12 \
0x51542d in display_rel_file \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200  #13 0x510f56 in \
display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7  #14 \
0x50faae in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12  \
#15 0x7f7c9296e680 in __libc_start_main \
/var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289

SUMMARY: AddressSanitizer: heap-buffer-overflow \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:616:10 in read_1_byte \
Shadow bytes around the buggy address:  0x0c267fff8050: 00 00 00 00 00 00 00 00 00 00 00 00 00 \
00 00 00  0x0c267fff8060: 00 00 00 00 00 00 00 00 00 00 00 04 fa fa fa fa
  0x0c267fff8070: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c267fff8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c267fff8090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c267fff80a0: 00 00[02]fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c267fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c267fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c267fff80d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c267fff80e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c267fff80f0: 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
==3235==ABORTING

Affected version:
2.29.51.20170921 and maybe past releases

Fixed version:
N/A

Commit fix:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=515f23e63c0074ab531bc954f84ca40c6281a724


Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.

CVE:
CVE-2017-14939

Reproducer:
https://github.com/asarubbo/poc/blob/master/00370-binutils-heapoverflow-read_1_byte

Timeline:
2017-09-21: bug discovered and reported to upstream
2017-09-24: upstream released a patch
2017-09-26: blog post about the issue
2017-09-29: CVE assigned

Note:
This bug was found with American Fuzzy Lop.
This bug was identified with bare metal servers donated by Packet. This work is also supported \
by the Core Infrastructure Initiative.

Permalink:
https://blogs.gentoo.org/ago/2017/09/26/binutils-heap-based-buffer-overflow-in-read_1_byte-dwarf2-c


--
Agostino Sarubbo
Gentoo Linux Developer


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