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Message-ID: <116345.929538028-sendEmail@localhost>
Date: Wed, 4 Oct 2017 15:42:21 +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 parse_die (dwarf1.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
==26890==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6130000006d3 at pc 0x000000472115 bp 0x7ffdb7d8a0d0 sp 0x7ffdb7d89880
READ of size 298 at 0x6130000006d3 thread T0
#0 0x472114 in __interceptor_strlen /var/tmp/portage/sys-libs/compiler-rt-sanitizers-5.0.0/work/compiler-rt-5.0.0.src/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:302
#1 0x68fea5 in parse_die /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf1.c:254:12
#2 0x68ddda in _bfd_dwarf1_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf1.c:521:13
#3 0x5f2f00 in _bfd_elf_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8659:10
#4 0x517755 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1004:12
#5 0x514e4d in print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7
#6 0x514e4d in display_rel_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200
#7 0x510976 in display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7
#8 0x50f4ce in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12
#9 0x7f3dea34e680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
#10 0x41a638 in chmod (/usr/x86_64-pc-linux-gnu/binutils-bin/git/nm+0x41a638)
0x6130000006d3 is located 0 bytes to the right of 339-byte region [0x613000000580,0x6130000006d3)
allocated by thread T0 here:
#0 0x4d8828 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 0x53f138 in bfd_malloc /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/libbfd.c:193:9
#2 0x799bc8 in bfd_get_full_section_contents /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/compress.c:248:21
#3 0x7b8797 in bfd_simple_get_relocated_section_contents /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/simple.c:193:12
#4 0x68e3b1 in _bfd_dwarf1_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf1.c:490:4
#5 0x5f2f00 in _bfd_elf_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8659:10
#6 0x517755 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1004:12
#7 0x514e4d in print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7
#8 0x514e4d in display_rel_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200
#9 0x510976 in display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7
#10 0x50f4ce in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12
#11 0x7f3dea34e680 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-libs/compiler-rt-sanitizers-5.0.0/work/compiler-rt-5.0.0.src/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:302 in
__interceptor_strlen
Shadow bytes around the buggy address:
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 00 04 fa fa fa fa fa fa fa fa fa fa fa fa
0x0c267fff80b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c267fff80c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c267fff80d0: 00 00 00 00 00 00 00 00 00 00[03]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
0x0c267fff8100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c267fff8110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c267fff8120: 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
==26890==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=1da5c9a485f3dcac4c45e96ef4b7dae5948314b5
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-15020
Reproducer:
https://github.com/asarubbo/poc/blob/master/00376-binutils-heapoverflow-parse_die
Timeline:
2017-09-25: bug discovered and reported to upstream
2017-09-25: 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-parse_die-dwarf1-c/
--
Agostino Sarubbo
Gentoo Linux Developer
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