[Nasm-bugs] [Bug 3392644] New: heap-buffer-overflow in hash_findi at hashtbl.c:157

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392644

            Bug ID: 3392644
           Summary: heap-buffer-overflow in hash_findi at hashtbl.c:157
           Product: NASM
           Version: 2.15 (development)
          Hardware: PC
                OS: Linux
            Status: OPEN
          Severity: normal
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: prada960808 at gmail.com
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Built from git using configure

Created attachment 411755
  --> https://bugzilla.nasm.us/attachment.cgi?id=411755&action=edit
poc

Hi, 
I found a heap-buffer-overflow in hash_findi at hashtbl.c:157
It is triggered in nasm version 2.15.
NASM version 2.15rc0-20191023 compiled on Dec  9 2019

Please run following command

$ nasm -o /dev/null -f bin $PoC

Here's ASAN log
==28391==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x612000000456 at pc 0x00000049552c bp 0x7fffe7228b50 sp 0x7fffe7228300
READ of size 279 at 0x612000000456 thread T0
    #0 0x49552b in __interceptor_strlen.part.30
(/mnt/hda2/suhwan/BUG_AFL/ezxml_fuzzing/nasm+0x49552b)
    #1 0x9c4906 in hash_findi
/home/suhwan/project/program/nasm-2.15rc0-20191023/nasmlib/hashtbl.c:157:35
    #2 0x6932c5 in hash_findix
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:1171:9
    #3 0x6932c5 in expand_one_smacro
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:4999
    #4 0x690e0f in expand_smacro_noreset
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:5474:27
    #5 0x5e8c10 in expand_smacro
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:5431:12
    #6 0x5e8c10 in pp_tokline
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:6415
    #7 0x5e8c10 in pp_getline
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:6428
    #8 0x50a7f9 in assemble_file
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/nasm.c:1630:24
    #9 0x50a7f9 in main
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/nasm.c:637
    #10 0x7f5cbe6a9b96 in __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #11 0x41a4a9 in _start
(/mnt/hda2/suhwan/BUG_AFL/ezxml_fuzzing/nasm+0x41a4a9)

0x612000000456 is located 0 bytes to the right of 278-byte region
[0x612000000340,0x612000000456)
allocated by thread T0 here:
    #0 0x4d8720 in malloc
(/mnt/hda2/suhwan/BUG_AFL/ezxml_fuzzing/nasm+0x4d8720)
    #1 0x526d10 in nasm_malloc
/home/suhwan/project/program/nasm-2.15rc0-20191023/nasmlib/alloc.c:55:9
    #2 0x5e8c10 in expand_smacro
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:5431:12
    #3 0x5e8c10 in pp_tokline
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:6415
    #4 0x5e8c10 in pp_getline
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/preproc.c:6428
    #5 0x50a7f9 in assemble_file
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/nasm.c:1630:24
    #6 0x50a7f9 in main
/home/suhwan/project/program/nasm-2.15rc0-20191023/asm/nasm.c:637
    #7 0x7f5cbe6a9b96 in __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310

SUMMARY: AddressSanitizer: heap-buffer-overflow
(/mnt/hda2/suhwan/BUG_AFL/ezxml_fuzzing/nasm+0x49552b) in
__interceptor_strlen.part.30
Shadow bytes around the buggy address:
  0x0c247fff8030: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c247fff8040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c247fff8050: 00 00 00 00 00 00 00 00 00 00 06 fa fa fa fa fa
  0x0c247fff8060: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c247fff8070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c247fff8080: 00 00 00 00 00 00 00 00 00 00[06]fa fa fa fa fa
  0x0c247fff8090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff80a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c247fff80d0: 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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
==28391==ABORTING

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