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Message-ID: <2751056.p2fs675oKu@arcadia>
Date: Sat, 08 Oct 2016 22:17:29 +0200
From: Agostino Sarubbo <ago@...too.org>
To: oss-security@...ts.openwall.com
Subject: libdwarf: heap-based buffer overflow in _dwarf_get_abbrev_for_code (dwarf_util.c) (ANOTHER ONE)
Description:
libdwarf is a library to consume and produce DWARF debug information.
A fuzzing revealed an out bounds read,
The complete ASan output:
# dwarfdump $FILE
==24449==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6110000059ed at pc 0x000000606cd5 bp 0x7fff42bdc5f0 sp 0x7fff42bdc5e8
READ of size 1 at 0x6110000059ed thread T0
#0 0x606cd4 in _dwarf_get_abbrev_for_code
/tmp/dwarf-20161001/libdwarf/dwarf_util.c:590:9
#1 0x576086 in dwarf_siblingof_b
/tmp/dwarf-20161001/libdwarf/dwarf_die_deliv.c:1628:12
#2 0x517e73 in print_die_and_children_internal
/tmp/dwarf-20161001/dwarfdump/print_die.c:1163:17
#3 0x517c6b in print_die_and_children_internal
/tmp/dwarf-20161001/dwarfdump/print_die.c:1142:13
#4 0x5147cc in print_die_and_children
/tmp/dwarf-20161001/dwarfdump/print_die.c:921:5
#5 0x5147cc in print_one_die_section
/tmp/dwarf-20161001/dwarfdump/print_die.c:831
#6 0x512262 in print_infos
/tmp/dwarf-20161001/dwarfdump/print_die.c:371:16
#7 0x4faaea in process_one_file
/tmp/dwarf-20161001/dwarfdump/dwarfdump.c:1371:9
#8 0x4faaea in main /tmp/dwarf-20161001/dwarfdump/dwarfdump.c:654
#9 0x7fa649d7e61f in __libc_start_main /var/tmp/portage/sys-
libs/glibc-2.22-r4/work/glibc-2.22/csu/libc-start.c:289
#10 0x419588 in _start (/usr/bin/dwarfdump-asan+0x419588)
0x6110000059ed is located 0 bytes to the right of 237-byte region
[0x611000005900,0x6110000059ed)
allocated by thread T0 here:
#0 0x4c0ad8 in malloc /var/tmp/portage/sys-devel/llvm-3.8.1-
r2/work/llvm-3.8.1.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:52
#1 0x7fa64ae58206 in __libelf_set_rawdata_wrlock /tmp/portage/dev-
libs/elfutils-0.166/work/elfutils-0.166/libelf/elf_getdata.c:318
SUMMARY: AddressSanitizer: heap-buffer-overflow
/tmp/dwarf-20161001/libdwarf/dwarf_util.c:590:9 in _dwarf_get_abbrev_for_code
Shadow bytes around the buggy address:
0x0c227fff8ae0: 00 00 00 00 00 00 00 00 06 fa fa fa fa fa fa fa
0x0c227fff8af0: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
0x0c227fff8b00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c227fff8b10: fd fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8b20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c227fff8b30: 00 00 00 00 00 00 00 00 00 00 00 00 00[05]fa fa
0x0c227fff8b40: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
0x0c227fff8b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c227fff8b60: 00 fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c227fff8b70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c227fff8b80: 00 00 00 00 00 00 00 00 00 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
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
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
==24449==ABORTING
Affected version:
20161001 and past
Fixed version:
N/A
Commit fix:
https://sourceforge.net/p/libdwarf/code/ci/2d14a7792889e33bc542c28d0f3792964c46214f/#diff-13
and then
https://sourceforge.net/p/libdwarf/code/ci/efe48cad0693d6994d9a7b561e1c3833b073a624/#diff-2
(because of a mistake)
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
Timeline:
2016-10-04: bug discovered
2016-10-04: bug reported privately to upstream
2016-10-04: upstream realeased a patch
2016-10-06: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
https://blogs.gentoo.org/ago/2016/10/06/libdwarf-heap-based-buffer-overflow-in-_dwarf_get_abbrev_for_code-dwarf_util-c-2/
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