[Bug binutils/22552] New: readelf - heap buffer overflow in load_debug_section()

[jonghyk.song at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22552

            Bug ID: 22552
           Summary: readelf - heap buffer overflow in load_debug_section()
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: jonghyk.song at gmail dot com
  Target Milestone: ---

Created attachment 10667
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10667&action=edit
crafted_elf_file

Dear all,

I found this bug with AFL fuzzer(2.52b).

My fuzzing environments are as follows:

1. $ uname -an
Linux jhsong-ubuntu 4.10.0-40-generic #44~16.04.1-Ubuntu SMP Thu Nov 9 15:37:44
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

2. git commit: 8fbc617a46b015098876a7515c3a7ad6d1682876

3. build
CC="afl-gcc" CXX="afl-g++" CFLAGS="-fsanitize=address -ggdb -lpthread"
CXXFLAGS="-fsanitize=address -ggdb" LDFLAGS='-ldl' LIBS="-ldl" ./configure 


To reproduce:
1. download the attached file
2. ./readelf -a [attached file]


Thank you.



==1204==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x61200000c3e0
at pc 0x0000004a59ed bp 0x7fffce243f00 sp 0x7fffce243ef0
READ of size 8 at 0x61200000c3e0 thread T0
    #0 0x4a59ec in load_debug_section
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf.c:13588
    #1 0x538a91 in load_separate_debug_file
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/dwarf.c:9839
    #2 0x49c347 in process_object
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf.c:18580
    #3 0x404c5c in process_file
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf.c:19004
    #4 0x404c5c in main
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf.c:19063
    #5 0x7f885963b82f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #6 0x405988 in _start
(/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf+0x405988)

AddressSanitizer can not describe address in more detail (wild memory access
suspected).
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/jhsong/fuzzing/binutils/binutils-gdb/binutils/readelf.c:13588
load_debug_section
Shadow bytes around the buggy address:
  0x0c247fff9820: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff9830: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff9840: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff9850: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff9860: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c247fff9870: fa fa fa fa fa fa fa fa fa fa fa fa[fa]fa fa fa
  0x0c247fff9880: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff9890: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff98a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff98b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff98c0: 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
==1204==ABORTING

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