Bug: heap-buffer-overflow in mujs/mujs/jsarray.c:247:24

[MetamorphicAgg]

Bug: heap-buffer-overflow in mujs/mujs/jsarray.c:247:24

Environment:

Distributor ID: Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04

Compiler:

Ubuntu clang version 14.0.6
Target: x86_64-pc-linux-gnu
Thread model: posix

Compiling:

CFLAGS="-fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer -g" CXXFLAGS="-fsanitize=address -fsanitize=undefined -fno-omit-frame-pointer -g" make

Version:

tag: 1.3.7

PoCfile:

Unzip the following file.

poc.zip

Behavior:

./mujs poc/mujs_002.poc

Output:

/home/exp/src/mujs/mujs/jsrun.c:1550:29: runtime error: applying non-zero offset 18446744073709551608 to null pointer
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/exp/src/mujs/mujs/jsrun.c:1550:29 in 
=================================================================
==3955344==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c000000d9f at pc 0x5583f7bdf45c bp 0x7ffc2d3acea0 sp 0x7ffc2d3ace98
READ of size 1 at 0x60c000000d9f thread T0
    #0 0x5583f7bdf45b in Ap_sort_cmp /home/exp/src/mujs/mujs/jsarray.c:247:24
    #1 0x5583f7bdde32 in Ap_sort_sift /home/exp/src/mujs/mujs/jsarray.c:372:9
    #2 0x5583f7bddd27 in Ap_sort_heapsort /home/exp/src/mujs/mujs/jsarray.c:384:3
    #3 0x5583f7b4ddbb in Ap_sort /home/exp/src/mujs/mujs/jsarray.c:407:2
    #4 0x5583f7bba368 in jsR_callcfunction /home/exp/src/mujs/mujs/jsrun.c:1249:2
    #5 0x5583f7bb7733 in js_call /home/exp/src/mujs/mujs/jsrun.c:1299:3
    #6 0x5583f7c323de in jsR_run /home/exp/src/mujs/mujs/jsrun.c:1810:4
    #7 0x5583f7bb9e52 in jsR_callscript /home/exp/src/mujs/mujs/jsrun.c:1230:2
    #8 0x5583f7bb7162 in js_call /home/exp/src/mujs/mujs/jsrun.c:1295:3
    #9 0x5583f7bc0ed9 in js_dofile /home/exp/src/mujs/mujs/jsstate.c:249:2
    #10 0x5583f7b48425 in main /home/exp/src/mujs/mujs/main.c:363:7
    #11 0x7f4a6cc2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #12 0x7f4a6cc2a28a in __libc_start_main csu/../csu/libc-start.c:360:3
    #13 0x5583f7a884b4 in _start (/home/exp/bin/asan_ubsan/mujs+0xa34b4) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)

0x60c000000d9f is located 31 bytes to the right of 128-byte region [0x60c000000d00,0x60c000000d80)
allocated by thread T0 here:
    #0 0x5583f7b0c2ea in __interceptor_realloc (/home/exp/bin/asan_ubsan/mujs+0x1272ea) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)
    #1 0x5583f7bc24bf in js_defaultalloc /home/exp/src/mujs/mujs/jsstate.c:22:9
    #2 0x5583f7b7305d in js_realloc /home/exp/src/mujs/mujs/jsrun.c:48:8
    #3 0x5583f7c2cd1c in jsR_setarrayindex /home/exp/src/mujs/mujs/jsrun.c:658:21
    #4 0x5583f7bb48ac in jsR_setindex /home/exp/src/mujs/mujs/jsrun.c:780:3
    #5 0x5583f7c31b59 in jsR_run /home/exp/src/mujs/mujs/jsrun.c:1744:5
    #6 0x5583f7bb9e52 in jsR_callscript /home/exp/src/mujs/mujs/jsrun.c:1230:2
    #7 0x5583f7bb7162 in js_call /home/exp/src/mujs/mujs/jsrun.c:1295:3
    #8 0x5583f7bc0ed9 in js_dofile /home/exp/src/mujs/mujs/jsstate.c:249:2
    #9 0x5583f7b48425 in main /home/exp/src/mujs/mujs/main.c:363:7
    #10 0x7f4a6cc2a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #11 0x7f4a6cc2a28a in __libc_start_main csu/../csu/libc-start.c:360:3
    #12 0x5583f7a884b4 in _start (/home/exp/bin/asan_ubsan/mujs+0xa34b4) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/exp/src/mujs/mujs/jsarray.c:247:24 in Ap_sort_cmp
Shadow bytes around the buggy address:
  0x0c187fff8160: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x0c187fff8170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c187fff8180: fa fa fa fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c187fff8190: 00 00 00 00 00 00 00 00 fa fa fa fa fa fa fa fa
  0x0c187fff81a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c187fff81b0: fa fa fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff81c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff81d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff81e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff81f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff8200: 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
==3955344==ABORTING