Bug #78182 [Com]: Segmentation Fault in zend_execute.c:2572

From: Date: Wed, 19 Jun 2019 14:12:06 +0000
Subject: Bug #78182 [Com]: Segmentation Fault in zend_execute.c:2572
References: 1  Groups: php.bugs php.qa 
Request: Send a blank email to php-bugs+get-221392@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=78182&edit=1

 ID:                 78182
 Comment by:         danack@php.net
 Reported by:        nguyenmanhdung1710 at gmail dot com
 Summary:            Segmentation Fault in zend_execute.c:2572
 Status:             Open
 Type:               Bug
 Package:            Testing related
 Operating System:   Ubuntu 16.04 x64
 PHP Version:        7.3.6
 Block user comment: N
 Private report:     N

 New Comment:

"php version 3.1.6"

That version of PHP is 'slightly' out of date. Can you confirm you really meant 7.3.6?


Previous Comments:
------------------------------------------------------------------------
[2019-06-19 14:01:30] nguyenmanhdung1710 at gmail dot com

Description:
------------
Our fuzzer found a crash (a potential false positive) on php version 3.1.6 (commit b1bdae7621) due
to a malformed input.

PoC: https://github.com/strongcourage/PoCs/blob/master/php_v3.1.6_b1bdae7621/PoC

Command: php $POC

Valgrind says:
==25180== Invalid read of size 1
==25180==    at 0x12A5359: zend_object_fetch_property_type_info (zend_execute.c:2572)
==25180==    by 0x12A5359: ZEND_ASSIGN_OBJ_REF_SPEC_VAR_TMPVAR_OP_DATA_VAR_HANDLER
(zend_vm_execute.h:26956)
==25180==    by 0x12D6428: execute_ex (zend_vm_execute.h:62493)
==25180==    by 0x130F8DB: zend_execute (zend_vm_execute.h:65287)
==25180==    by 0xF374A2: zend_execute_scripts (zend.c:1625)
==25180==    by 0xD08147: php_execute_script (main.c:2650)
==25180==    by 0x131A67C: do_cli (php_cli.c:985)
==25180==    by 0x26F6FC: main (php_cli.c:1375)
==25180==  Address 0x125 is not stack'd, malloc'd or (recently) free'd

ASAN says:
ASAN:DEADLYSIGNAL
=================================================================
==11961==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000124 (pc 0x5654a71320f8 bp
0x7ffc1c9e4470 sp 0x7ffc1c9e4460 T0)
==11961==The signal is caused by a READ memory access.
==11961==Hint: address points to the zero page.
    #0 0x5654a71320f7 in zend_object_fetch_property_type_info
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_execute.c:2572
    #1 0x5654a7293da3 in ZEND_ASSIGN_OBJ_REF_SPEC_VAR_TMPVAR_OP_DATA_VAR_HANDLER
/home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:26956
    #2 0x5654a741388d in execute_ex /home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:62493
    #3 0x5654a742a6f5 in zend_execute /home/dungnm/fuzzing/php-7.3.6/Zend/zend_vm_execute.h:65287
    #4 0x5654a6fab1e2 in zend_execute_scripts /home/dungnm/fuzzing/php-7.3.6/Zend/zend.c:1625
    #5 0x5654a6e04ee1 in php_execute_script /home/dungnm/fuzzing/php-7.3.6/main/main.c:2650
    #6 0x5654a7433157 in do_cli /home/dungnm/fuzzing/php-7.3.6/sapi/cli/php_cli.c:985
    #7 0x5654a74358aa in main /home/dungnm/fuzzing/php-7.3.6/sapi/cli/php_cli.c:1375
    #8 0x7f4efe1a9b96 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #9 0x5654a6513369 in _start (/home/dungnm/fuzzing/php-7.3.6/obj-asan/sapi/cli/php+0x341369)

Thanks,
Manh Dung




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