[Nasm-bugs] [Bug 3392531] New: There is a heap-use-after-free at asm/preproc.c:5055(function:pp_getline) in nasm2.14rc16 that will cause dos attack.

[noreply-nasm at gorcunov.org]

https://bugzilla.nasm.us/show_bug.cgi?id=3392531

            Bug ID: 3392531
           Summary: There is a heap-use-after-free at
                    asm/preproc.c:5055(function:pp_getline) in
                    nasm2.14rc16 that will cause dos attack.
           Product: NASM
           Version: 2.14 (development)
          Hardware: All
                OS: All
            Status: OPEN
          Severity: blocker
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: ganshuitao at gmail.com
                CC: gorcunov at gmail.com, hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Binary from nasm.us

Created attachment 411690
  --> https://bugzilla.nasm.us/attachment.cgi?id=411690&action=edit
Trigger by"./nasm -f bin POC8 -o xxx"

version:nasm2.14rc16
Summary: 

There is a heap-use-after-free at asm/preproc.c:5055(function:pp_getline) in
nasm2.14rc16 that will cause dos attack. 

Description:

The ubsan debug is as follows:

$./nasm -f bin POC8 -o xxx

=================================================================
=================================================================
==113343==ERROR: AddressSanitizer: heap-use-after-free on address
0x60f00000d430 at pc 0x00000044769e bp 0x7ffe333a6c90 sp 0x7ffe333a6c80
READ of size 8 at 0x60f00000d430 thread T0
    #0 0x44769d in pp_getline asm/preproc.c:5055
    #1 0x40d791 in assemble_file asm/nasm.c:1442
    #2 0x40640d in main asm/nasm.c:573
    #3 0x7feb98dbea3f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)
    #4 0x4072f8 in _start
(/home/company/real_sanitize/poc_check/nasm/nasm_new_addr+0x4072f8)

0x60f00000d430 is located 16 bytes inside of 176-byte region
[0x60f00000d420,0x60f00000d4d0)
freed by thread T0 here:
    #0 0x7feb992006aa in __interceptor_free
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x986aa)
    #1 0x443fa0 in free_mmacro asm/preproc.c:630
    #2 0x443fa0 in do_directive asm/preproc.c:2957

previously allocated by thread T0 here:
    #0 0x7feb99200b49 in __interceptor_calloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98b49)
    #1 0x40e4e0 in nasm_zalloc nasmlib/malloc.c:69
    #2 0x4bd707 
(/home/company/real_sanitize/poc_check/nasm/nasm_new_addr+0x4bd707)

SUMMARY: AddressSanitizer: heap-use-after-free asm/preproc.c:5055 pp_getline
Shadow bytes around the buggy address:
  0x0c1e7fff9a30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff9a40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff9a50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff9a60: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1e7fff9a70: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c1e7fff9a80: fa fa fa fa fd fd[fd]fd fd fd fd fd fd fd fd fd
  0x0c1e7fff9a90: fd fd fd fd fd fd fd fd fd fd fa fa fa fa fa fa
  0x0c1e7fff9aa0: fa fa 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff9ab0: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x0c1e7fff9ac0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c1e7fff9ad0: 00 00 00 00 00 00 fa fa fa fa fa fa fa fa 00 00
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
==113343==ABORTING

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