https://sourceware.org/bugzilla/show_bug.cgi?id=22058
Bug ID: 22058
Summary: Heap out of bounds read in _bfd_elf_attr_strdup()
Product: binutils
Version: 2.29
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: fumfi.255 at gmail dot com
Target Milestone: ---
Created attachment 10383
--> https://sourceware.org/bugzilla/attachment.cgi?id=10383&action=edit
POC to trigger heap out of bounds read (objdump)
After some fuzz testing I found a crashing test case.
Version: 2.29
Command: objdump -x -Wl -R -SD objdump_hoobr_bfd_elf_attr_strdup
ASAN:
==29788==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x619000004090 at pc 0x000000424b5f bp 0x7fff480b0c50 sp 0x7fff480b03f8
READ of size 1 at 0x619000004090 thread T0
#0 0x424b5e in __interceptor_strlen
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:227:5
#1 0x794012 in _bfd_elf_attr_strdup XYZ/binutils-2.29/bfd/elf-attrs.c:310:9
#2 0x794012 in bfd_elf_add_obj_attr_string
XYZ/binutils-2.29/bfd/elf-attrs.c:323
#3 0x796201 in _bfd_elf_parse_attributes
XYZ/binutils-2.29/bfd/elf-attrs.c:533:6
#4 0x6e3766 in bfd_section_from_shdr XYZ/binutils-2.29/bfd/elf.c:2448:4
#5 0x803733 in bfd_elf32_object_p XYZ/binutils-2.29/bfd/./elfcode.h:805:7
#6 0x65bf6c in bfd_check_format_matches
XYZ/binutils-2.29/bfd/format.c:311:14
#7 0x4e8bb5 in display_object_bfd
XYZ/binutils-2.29/binutils/./objdump.c:3601:7
#8 0x4e8bb5 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c:3692
#9 0x4e7d5a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
#10 0x4e7d5a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
#11 0x7ff780a6f82f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#12 0x419d98 in _start (XYZ/binutils-2.29/binutils/objdump+0x419d98)
0x619000004090 is located 0 bytes to the right of 1040-byte region
[0x619000003c80,0x619000004090)
allocated by thread T0 here:
#0 0x4b85ac in malloc
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:64:3
#1 0x6618b3 in bfd_malloc XYZ/binutils-2.29/bfd/libbfd.c:193:9
#2 0x6e3766 in bfd_section_from_shdr XYZ/binutils-2.29/bfd/elf.c:2448:4
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:227:5
in __interceptor_strlen
Shadow bytes around the buggy address:
0x0c327fff87c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff87d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff87e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff87f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c327fff8800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c327fff8810: 00 00[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8820: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8830: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8840: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8850: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c327fff8860: 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
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
==29788==ABORTING
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