Bug: heap-buffer-overflow in mujs/mujs/jsarray.c:246:24

[MetamorphicAgg]

Bug: heap-buffer-overflow in mujs/mujs/jsarray.c:246:24

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_001.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 
=================================================================
==3947254==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c000000b8f at pc 0x55716acd135a bp 0x7ffc3fce86d0 sp 0x7ffc3fce86c8
READ of size 1 at 0x60c000000b8f thread T0
    #0 0x55716acd1359 in Ap_sort_cmp /home/exp/src/mujs/mujs/jsarray.c:246:24
    #1 0x55716acd0b7d in Ap_sort_leaf /home/exp/src/mujs/mujs/jsarray.c:357:7
    #2 0x55716accfe20 in Ap_sort_sift /home/exp/src/mujs/mujs/jsarray.c:371:10
    #3 0x55716accfd27 in Ap_sort_heapsort /home/exp/src/mujs/mujs/jsarray.c:384:3
    #4 0x55716ac3fdbb in Ap_sort /home/exp/src/mujs/mujs/jsarray.c:407:2
    #5 0x55716acac368 in jsR_callcfunction /home/exp/src/mujs/mujs/jsrun.c:1249:2
    #6 0x55716aca9733 in js_call /home/exp/src/mujs/mujs/jsrun.c:1299:3
    #7 0x55716ad243de in jsR_run /home/exp/src/mujs/mujs/jsrun.c:1810:4
    #8 0x55716acabe52 in jsR_callscript /home/exp/src/mujs/mujs/jsrun.c:1230:2
    #9 0x55716aca9162 in js_call /home/exp/src/mujs/mujs/jsrun.c:1295:3
    #10 0x55716acb2ed9 in js_dofile /home/exp/src/mujs/mujs/jsstate.c:249:2
    #11 0x55716ac3a425 in main /home/exp/src/mujs/mujs/main.c:363:7
    #12 0x7fb74d42a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #13 0x7fb74d42a28a in __libc_start_main csu/../csu/libc-start.c:360:3
    #14 0x55716ab7a4b4 in _start (/home/exp/bin/asan_ubsan/mujs+0xa34b4) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)

0x60c000000b8f is located 271 bytes to the right of 128-byte region [0x60c000000a00,0x60c000000a80)
allocated by thread T0 here:
    #0 0x55716abfe2ea in __interceptor_realloc (/home/exp/bin/asan_ubsan/mujs+0x1272ea) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)
    #1 0x55716acb44bf in js_defaultalloc /home/exp/src/mujs/mujs/jsstate.c:22:9
    #2 0x55716ac6505d in js_realloc /home/exp/src/mujs/mujs/jsrun.c:48:8
    #3 0x55716ad1ed1c in jsR_setarrayindex /home/exp/src/mujs/mujs/jsrun.c:658:21
    #4 0x55716aca68ac in jsR_setindex /home/exp/src/mujs/mujs/jsrun.c:780:3
    #5 0x55716ad23b59 in jsR_run /home/exp/src/mujs/mujs/jsrun.c:1744:5
    #6 0x55716acabe52 in jsR_callscript /home/exp/src/mujs/mujs/jsrun.c:1230:2
    #7 0x55716aca9162 in js_call /home/exp/src/mujs/mujs/jsrun.c:1295:3
    #8 0x55716acb2ed9 in js_dofile /home/exp/src/mujs/mujs/jsstate.c:249:2
    #9 0x55716ac3a425 in main /home/exp/src/mujs/mujs/main.c:363:7
    #10 0x7fb74d42a1c9 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #11 0x7fb74d42a28a in __libc_start_main csu/../csu/libc-start.c:360:3
    #12 0x55716ab7a4b4 in _start (/home/exp/bin/asan_ubsan/mujs+0xa34b4) (BuildId: c001f7ca802cfd9dd64ad00127473712f50f5d3a)

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/exp/src/mujs/mujs/jsarray.c:246:24 in Ap_sort_cmp
Shadow bytes around the buggy address:
  0x0c187fff8120: fa fa fa fa fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c187fff8130: fd fd fd fd fd fd fd fd fa fa fa fa fa fa fa fa
  0x0c187fff8140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c187fff8150: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff8160: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c187fff8170: fa[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff8190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c187fff81a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  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
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
==3947254==ABORTING