[prev in list] [next in list] [prev in thread] [next in thread] 

List:       oss-security
Subject:    [oss-security] binutils: invalid memory read in find_abstract_instance_name (dwarf2.c)
From:       "Agostino Sarubbo" <ago () gentoo ! org>
Date:       2017-10-27 20:25:56
Message-ID: 577273.647857027-sendEmail () localhost
[Download RAW message or body]

------MIME delimiter for sendEmail-874608.076484041
Content-Type: text/plain;
        charset="UTF-8"
Content-Transfer-Encoding: 7bit

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
==23816==ERROR: AddressSanitizer: SEGV on unknown address 0x4700004008d0 (pc 0x0000005427b6 bp \
0x7ffd49033690 sp 0x7ffd49033680 T0)                                                            \
 ==23816==The signal is caused by a READ memory access.                                         \
  #0 0x5427b5 in _bfd_safe_read_leb128 \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:1019:14                     \
  #1 0x6a9b25 in find_abstract_instance_name \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:2918:19                     \
  #2 0x69a3ff in scan_unit_for_symbols \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3168:10                     \
  #3 0x6a2de6 in comp_unit_maybe_decode_line_info \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3660:9                      \
  #4 0x6a2de6 in comp_unit_find_line \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3686                        \
  #5 0x6a0369 in _bfd_dwarf2_find_nearest_line \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4798:11                     \
  #6 0x5f332e in _bfd_elf_find_line \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8695:10                        \
  #7 0x5176a3 in print_symbol \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9                     \
  #8 0x514e4d in print_symbols \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7                     \
  #9 0x514e4d in display_rel_file \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200                       \
  #10 0x510976 in display_file \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7                     \
  #11 0x50f4ce in main \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12                    \
  #12 0x7f839bb03680 in __libc_start_main \
/var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289             \
  #13 0x41a638 in chmod (/usr/x86_64-pc-linux-gnu/binutils-bin/git/nm+0x41a638)                 \
  
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV \
/var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:1019:14 in \
_bfd_safe_read_leb128 ==23816==ABORTING

Affected version:
2.29.51.20170925 and maybe past releases

Fixed version:
N/A

Commit fix:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=1b86808a86077722ee4f42ff97f836b12420bb2a


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

CVE:
CVE-2017-15938

Reproducer:
https://github.com/asarubbo/poc/blob/master/00381-binutils-invalidread-find_abstract_instance_name


Timeline:
2017-09-26: bug discovered and reported to upstream
2017-09-26: upstream released a patch
2017-10-24: blog post about the issue
2017-10-27: 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/2017/10/24/binutils-invalid-memory-read-in-find_abstract_instance_name-dwarf2-c/


--
Agostino Sarubbo
Gentoo Linux Developer


------MIME delimiter for sendEmail-874608.076484041--


[prev in list] [next in list] [prev in thread] [next in thread]