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Date: Wed, 4 Oct 2017 15:43:42 +0000
From: "Agostino Sarubbo" <ago@...too.org>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: binutils: NULL pointer dereference in concat_filename (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
==3765==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000006a7376 bp 0x7ffd5f9a3d50 sp 0x7ffd5f9a3d20 T0)
==3765==The signal is caused by a READ memory access.
==3765==Hint: address points to the zero page.
    #0 0x6a7375 in concat_filename /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:1601:8
    #1 0x696e83 in decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:2258:44
    #2 0x6a2ab8 in comp_unit_maybe_decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3642:26
    #3 0x6a2ab8 in comp_unit_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3677
    #4 0x6a0104 in _bfd_dwarf2_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4789:11
    #5 0x5f330e in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8695:10
    #6 0x5176a3 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9
    #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 0x7f0f4a74b680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289
    #12 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/dwarf2.c:1601:8 in concat_filename
==3765==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=c361faae8d964db951b7100cada4dcdc983df1bf

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

CVE:
CVE-2017-15023

Reproducer:
https://github.com/asarubbo/poc/blob/master/00374-binutils-NULLptr-concat_filename

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-null-pointer-dereference-in-concat_filename-dwarf2-c/

--
Agostino Sarubbo
Gentoo Linux Developer


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