CVE-2017-14939
medium
CVSS v3
5.5
CVSS v4 NEW
—
VIR risk
6.5
Description
decode_line_info in dwarf2.c in the Binary File Descriptor (BFD) library (aka libbfd), as distributed in GNU Binutils 2.29, mishandles a length calculation, which allows remote attackers to cause a denial of service (heap-based buffer over-read and application crash) via a crafted ELF file, related to read_1_byte.
Predictions
Exploit likelihood
55%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
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Exploits
Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.
Exploit-DB
binutils 2.29.51.20170921 - 'read_1_byte' Heap Buffer Overflow
Source: https://blogs.gentoo.org/ago/2017/09/26/binutils-heap-based-buffer-overflow-in-read_1_byte-dwarf2-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
==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
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42970.zip
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/
Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/42970.zip
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2.29.90.20180122-1 |
| sid | Fixed | 2.29.90.20180122-1 |
| forky | Fixed | 2.29.90.20180122-1 |
| bullseye | Fixed | 2.29.90.20180122-1 |
| bookworm | Fixed | 2.29.90.20180122-1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| gnu | binutils | 2.29 | |
References
- http://www.securityfocus.com/bid/101216
- https://blogs.gentoo.org/ago/2017/09/26/binutils-heap-based-buffer-overflow-in-read_1_byte-dwarf2-c/
- https://sourceware.org/bugzilla/show_bug.cgi?id=22169
- https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git%3Bh=515f23e63c0074ab531bc954f84ca40c6281a724
- https://www.exploit-db.com/exploits/42970/
- https://security-tracker.debian.org/tracker/CVE-2017-14939
- https://www.suse.com/security/cve/CVE-2017-14939.html
CWEs
CWE-125
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.