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Date: Wed, 4 Oct 2017 15:44:15 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: binutils: heap-based buffer overflow in bfd_get_debug_link_info_1 (opncls.c)
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
==11994==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000029e at pc 0x7f800af7095d bp 0x7ffeab0e5c90 sp 0x7ffeab0e5c88
READ of size 1 at 0x60200000029e thread T0
#0 0x7f800af7095c in bfd_getl32 /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:559:24
#1 0x7f800af91323 in bfd_get_debug_link_info_1 /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1206:12
#2 0x7f800af91b8a in find_separate_debug_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1423:10
#3 0x7f800af91a0f in bfd_follow_gnu_debuglink /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1582:10
#4 0x7f800b110614 in _bfd_dwarf2_slurp_debug_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4345:19
#5 0x7f800b11bc67 in _bfd_dwarf2_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4538:9
#6 0x7f800b05e38b in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8695:10
#7 0x517c83 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9
#8 0x51542d in print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7
#9 0x51542d in display_rel_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200
#10 0x510f56 in display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7
#11 0x50faae in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12
#12 0x7f8009fa3680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#13 0x41ac18 in _init (/usr/x86_64-pc-linux-gnu/binutils-bin/git/nm+0x41ac18)
0x60200000029e is located 0 bytes to the right of 14-byte region [0x602000000290,0x60200000029e)
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 0x7f800af6f3fc in bfd_malloc /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:193:9
#2 0x7f800af64b9f in bfd_get_full_section_contents /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/compress.c:248:21
#3 0x7f800af91230 in bfd_get_debug_link_info_1 /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1191:8
#4 0x7f800af91b8a in find_separate_debug_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1423:10
#5 0x7f800af91a0f in bfd_follow_gnu_debuglink /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/opncls.c:1582:10
#6 0x7f800b110614 in _bfd_dwarf2_slurp_debug_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4345:19
#7 0x7f800b11bc67 in _bfd_dwarf2_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4538:9
#8 0x7f800b05e38b in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8695:10
#9 0x517c83 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9
#10 0x51542d in print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7
#11 0x51542d in display_rel_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200
#12 0x510f56 in display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7
#13 0x50faae in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12
#14 0x7f8009fa3680 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/libbfd.c:559:24 in bfd_getl32
Shadow bytes around the buggy address:
0x0c047fff8000: fa fa 00 01 fa fa 00 06 fa fa fd fa fa fa fd fa
0x0c047fff8010: fa fa fd fd fa fa fd fa fa fa fd fa fa fa fd fa
0x0c047fff8020: fa fa fd fa fa fa fd fd fa fa fd fa fa fa fd fa
0x0c047fff8030: fa fa fd fa fa fa fd fd fa fa fd fa fa fa fd fa
0x0c047fff8040: fa fa fd fa fa fa fd fd fa fa fd fa fa fa 00 fa
=>0x0c047fff8050: fa fa 00[06]fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8070: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8080: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff80a0: 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
==11994==ABORTING
Affected version:
2.29.51.20170924 and maybe past releases
Fixed version:
N/A
Commit fix:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=52b36c51e5bf6d7600fdc6ba115b170b0e78e31d
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-15021
Reproducer:
https://github.com/asarubbo/poc/blob/master/00373-binutils-heapoverflow-bfd_getl32
Timeline:
2017-09-24: bug discovered and reported to upstream
2017-09-24: upstream released a patch
2017-10-03: blog post about the issue
2017-10-04: 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/2017/10/03/binutils-heap-based-buffer-overflow-in-bfd_getl32-opncls-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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