Bug 701793

Summary: heap-buffer-overflow at contrib/japanese/gdevmjc.c:670 in mj_raster_cmd
Product: Ghostscript Reporter: Suhwan <prada960808>
Component: GeneralAssignee: Julian Smith <julian.smith>
Status: RESOLVED FIXED QA Contact: Bug traffic <tech>
Severity: normal    
Priority: P4    
Version: master   
Hardware: PC   
OS: Linux   
Customer: Word Size: ---
Attachments: poc

Description Suhwan 2019-10-26 06:26:37 UTC
Created attachment 18377 [details]
poc

Hello.

I found a heap-buffer-overflow bug in GhostScript.

Please confirm.

Thanks.

OS: Ubuntu 18.04 64bit

Steps to reproduce:
1. Download the .POC files.
2. Compile the source code with ASan.
3. Run following cmd.

gs -sOutputFile=tmp -sDEVICE=mj700v2c $PoC

Here's ASAN report

=================================================================
==42361==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62f000029670 at pc 0x000001fdc864 bp 0x7fffdbbb03c0 sp 0x7fffdbbb03b8
READ of size 1 at 0x62f000029670 thread T0
    #0 0x1fdc863 in mj_raster_cmd ghostpdl/./contrib/japanese/gdevmjc.c:670:18
    #1 0x1fd2de5 in mj_print_page ghostpdl/./contrib/japanese/gdevmjc.c:1393:13
    #2 0x13f07d9 in gx_default_print_page_copies ghostpdl/./base/gdevprn.c:1231:12
    #3 0x13ef028 in gdev_prn_output_page_aux ghostpdl/./base/gdevprn.c:1133:27
    #4 0x22b6f20 in gs_output_page ghostpdl/./base/gsdevice.c:212:17
    #5 0x3054b9f in zoutputpage ghostpdl/./psi/zdevice.c:416:12
    #6 0x2e8bdb6 in interp ghostpdl/./psi/interp.c:1300:28
    #7 0x2e8bdb6 in gs_call_interp ghostpdl/./psi/interp.c:520
    #8 0x2e8bdb6 in gs_interpret ghostpdl/./psi/interp.c:477
    #9 0x2e3f451 in gs_main_interpret ghostpdl/./psi/imain.c:253:12
    #10 0x2e3f451 in gs_main_run_string_end ghostpdl/./psi/imain.c:791
    #11 0x2e3f451 in gs_main_run_string_with_length ghostpdl/./psi/imain.c:735
    #12 0x2e548f0 in run_string ghostpdl/./psi/imainarg.c:1117:12
    #13 0x2e548f0 in runarg ghostpdl/./psi/imainarg.c:1086
    #14 0x2e5302a in argproc ghostpdl/./psi/imainarg.c:1008:16
    #15 0x2e479f7 in gs_main_init_with_args01 ghostpdl/./psi/imainarg.c:241:24
    #16 0x2e539d0 in gs_main_init_with_args ghostpdl/./psi/imainarg.c:288:16
    #17 0x57b86f in main ghostpdl/./psi/gs.c:95:16
    #18 0x7fe15e3f1b96 in __libc_start_main /build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:310
    #19 0x482e79 in _start (gs+0x482e79)

0x62f000029670 is located 0 bytes to the right of 53872-byte region [0x62f00001c400,0x62f000029670)
allocated by thread T0 here:
    #0 0x542d30 in __interceptor_malloc (gs+0x542d30)
    #1 0x23640fd in gs_heap_alloc_bytes ghostpdl/./base/gsmalloc.c:193:34

SUMMARY: AddressSanitizer: heap-buffer-overflow ghostpdl/./contrib/japanese/gdevmjc.c:670:18 in mj_raster_cmd
Shadow bytes around the buggy address:
  0x0c5e7fffd270: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd290: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd2a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c5e7fffd2b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5e7fffd2c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa
  0x0c5e7fffd2d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd2e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd2f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd300: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c5e7fffd310: 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
==42361==ABORTING