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Message-ID: <93509.5195631845-sendEmail@localhost>
Date: Fri, 27 Oct 2017 20:25:11 +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) (INCOMPLETE FIX FOR CVE-2017-15023)
Description:
binutils is a set of tools necessary to build programs.
The commit fix for this issue says:
The PR22200 fuzzer testcase found one way to put NULLs into .debug_line file tables. PR22205 finds another.
So mitre considers this an incomplete fix.
The complete ASan output of the issue:
# nm -A -a -l -S -s --special-syms --synthetic --with-symbol-versions -D $FILE
==19042==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000006a76a6 bp 0x7ffde0afde30 sp 0x7ffde0afde00 T0)
==19042==The signal is caused by a READ memory access.
==19042==Hint: address points to the zero page.
#0 0x6a76a5 in concat_filename /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:1601:8
#1 0x696ff3 in decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:2265:44
#2 0x6a2d36 in comp_unit_maybe_decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3651:26
#3 0x6a2d36 in comp_unit_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3686
#4 0x6a0369 in _bfd_dwarf2_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4798:11
#5 0x5f332e 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 0x7f6c6d793680 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
==19042==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=a54018b72d75abf2e74bf36016702da06399c1d9
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
CVE-2017-15939
Reproducer:
https://github.com/asarubbo/poc/blob/master/00380-binutils-NULLptr-concat_filename
Timeline:
2017-09-25: 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-null-pointer-dereference-in-concat_filename-dwarf2-c-incomplete-fix-for-cve-2017-15023/
--
Agostino Sarubbo
Gentoo Linux Developer
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