Date: Wed, 4 Oct 2017 15:44:46 +0000 From: "Agostino Sarubbo" <ago@...too.org> To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com> Subject: binutils: divide-by-zero in decode_line_info (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 ==11125==ERROR: AddressSanitizer: FPE on unknown address 0x7f5e01fd42e5 (pc 0x7f5e01fd42e5 bp 0x7ffdaa5de290 sp 0x7ffdaa5de0e0 T0) #0 0x7f5e01fd42e4 in decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c #1 0x7f5e01fe192b in comp_unit_maybe_decode_line_info /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3608:26 #2 0x7f5e01fe192b in comp_unit_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:3643 #3 0x7f5e01fde94f in _bfd_dwarf2_find_nearest_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c:4755:11 #4 0x7f5e01f1c20b in _bfd_elf_find_line /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/elf.c:8694:10 #5 0x517c83 in print_symbol /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1003:9 #6 0x51542d in print_symbols /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1084:7 #7 0x51542d in display_rel_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1200 #8 0x510f56 in display_file /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1318:7 #9 0x50faae in main /var/tmp/portage/sys-devel/binutils-9999/work/binutils/binutils/nm.c:1792:12 #10 0x7f5e00e61680 in __libc_start_main /var/tmp/portage/sys-libs/glibc-2.23-r4/work/glibc-2.23/csu/../csu/libc-start.c:289 #11 0x41ac18 in _init (/usr/x86_64-pc-linux-gnu/binutils-bin/git/nm+0x41ac18) AddressSanitizer can not provide additional info. SUMMARY: AddressSanitizer: FPE /var/tmp/portage/sys-devel/binutils-9999/work/binutils/bfd/dwarf2.c in decode_line_info ==11125==ABORTING Affected version: 126.96.36.19970921 and maybe past releases Fixed version: N/A Commit fix: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=d8010d3e75ec7194a4703774090b27486b742d48 Credit: This bug was discovered by Agostino Sarubbo of Gentoo. CVE: CVE-2017-15025 Reproducer: https://github.com/asarubbo/poc/blob/master/00372-binutils-FPE-decode_line_info Timeline: 2017-09-22: 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-divide-by-zero-in-decode_line_info-dwarf2-c/ -- Agostino Sarubbo Gentoo Linux Developer
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