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Bug #80181 Stack Overflow in Zend_compile.c
Submitted: 2020-10-04 00:06 UTC Modified: 2020-10-05 10:28 UTC
From: m dot aldofirmansyah at gmail dot com Assigned: cmb (profile)
Status: Duplicate Package: Scripting Engine problem
PHP Version: 8.0.0rc1 OS: Ubuntu 16.04.1
Private report: No CVE-ID: None
 [2020-10-04 00:06 UTC] m dot aldofirmansyah at gmail dot com
Description:
------------
When fuzzing I found many crashes in php (I'm using php 8 beta 4, not using rc1 or clone from git because in dropdown it's not exist and only test it on php 8 beta 4), here is one of them:

And I can confirm it's exploitable by using crashwalk and exploitable plugin. Here is the crash summary:

(1 of 1) - Hash: ae42ee8f2f472356cebed32184624e5a.6774ea9ee13f7f931d84f48ea97b1999
---CRASH SUMMARY---
Filename: /root/fuzzing-crash-file/php/fuzzing3/id:000053,sig:06,src:012664+008424,op:splice,rep:16
SHA1: d809ab3e51feedf4f3d18d2ebf330655634ee87c
Classification: EXPLOITABLE
Hash: ae42ee8f2f472356cebed32184624e5a.6774ea9ee13f7f931d84f48ea97b1999
Command: /root/php/src/build/bin/php /root/fuzzing-crash-file/php/fuzzing3/id:000053,sig:06,src:012664+008424,op:splice,rep:16
Faulting Frame:
   zend_stack_count @ 0x0000000001fbbc41: in /root/php/src/build/bin/php
Disassembly:
Stack Head (1000 entries):
   zend_stack_count          @ 0x0000000001fbbc41: in /root/php/src/build/bin/php
   zend_short_circuiting_che @ 0x0000000001ef650f: in /root/php/src/build/bin/php
   zend_compile_var          @ 0x0000000001e4f6e7: in /root/php/src/build/bin/php
   zend_compile_expr_inner   @ 0x0000000001ee4a22: in /root/php/src/build/bin/php
   zend_compile_expr         @ 0x0000000001e44c7c: in /root/php/src/build/bin/php
   zend_compile_simple_var_n @ 0x0000000001e4d700: in /root/php/src/build/bin/php
   zend_compile_simple_var   @ 0x0000000001ee7055: in /root/php/src/build/bin/php
   zend_compile_var_inner    @ 0x0000000001ee66c0: in /root/php/src/build/bin/php
   zend_compile_var          @ 0x0000000001e4f714: in /root/php/src/build/bin/php
   zend_compile_expr_inner   @ 0x0000000001ee4a22: in /root/php/src/build/bin/php
   zend_compile_expr         @ 0x0000000001e44c7c: in /root/php/src/build/bin/php
   zend_compile_simple_var_n @ 0x0000000001e4d700: in /root/php/src/build/bin/php
   zend_compile_simple_var   @ 0x0000000001ee7055: in /root/php/src/build/bin/php
   zend_compile_var_inner    @ 0x0000000001ee66c0: in /root/php/src/build/bin/php
   zend_compile_var          @ 0x0000000001e4f714: in /root/php/src/build/bin/php
   zend_compile_expr_inner   @ 0x0000000001ee4a22: in /root/php/src/build/bin/php
Registers:
rax=0x0000000000000000 rbx=0x0000000004970600 rcx=0x0000000004989023 rdx=0x000000000092d94c 
rsi=0x0000000004972c4c rdi=0x000000000000645e rbp=0x00007ffefc404050 rsp=0x00007ffefc404000 
 r8=0x00000000049706c0  r9=0x00000000049706c0 r10=0x0000000000000963 r11=0x0000000004972c4c 
r12=0x00000ff05d219600 r13=0x0000000000000018 r14=0x0000000000003678 r15=0x000000000497e0a0 
rip=0x0000000001fbbc41 efl=0x0000000000010202  cs=0x0000000000000033  ss=0x000000000000002b 
 ds=0x0000000000000000  es=0x0000000000000000  fs=0x0000000000000000  gs=0x0000000000000000 
 k0=0x0000000000000000  k1=0x0000000000000000  k2=0x0000000000000000  k3=0x0000000000000000 
 k4=0x0000000000000000  k5=0x0000000000000000  k6=0x0000000000000000  k7=0x0000000000000000 
Extra Data:
   Description: Access violation during branch instruction
   Short description: BranchAv (4/22)
   Explanation: The target crashed on a branch instruction, which may indicate that the control flow is tainted.
---END SUMMARY---

Test script:
---------------
<?php
$str = ".";
$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$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?>

Actual result:
--------------
root@26a2804f2327:/root/php/src/build/bin# php poc1.php
AddressSanitizer:DEADLYSIGNAL
=================================================================
==18374==ERROR: AddressSanitizer: stack-overflow on address 0x7ffe621c0ff8 (pc 0x00000044ef18 bp 0x7ffe621c1078 sp 0x7ffe621c1000 T0)
    #0 0x44ef17 in FastPoisonShadow /tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_poisoning.h:55:5
    #1 0x44ef17 in __asan_alloca_poison /tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_fake_stack.cc:270
    #2 0x1e4d703 in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2631
    #3 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #4 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #5 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #6 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #7 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #8 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #9 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #10 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #11 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #12 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #13 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #14 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #15 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #16 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #17 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #18 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #19 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #20 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #21 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #22 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #23 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #24 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #25 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #26 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #27 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #28 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #29 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #30 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #31 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #32 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #33 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #34 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #35 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #36 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #37 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #38 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #39 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #40 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #41 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #42 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #43 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #44 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #45 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #46 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #47 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #48 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #49 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #50 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
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    #240 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #241 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #242 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #243 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
    #244 0x1ee677f in zend_compile_var_inner /root/php/src/Zend/zend_compile.c:9635:11
    #245 0x1e4f7d3 in zend_compile_var /root/php/src/Zend/zend_compile.c:9670:20
    #246 0x1ee4ae1 in zend_compile_expr_inner /root/php/src/Zend/zend_compile.c:9505:4
    #247 0x1e44d3b in zend_compile_expr /root/php/src/Zend/zend_compile.c:9625:2
    #248 0x1e4d7bf in zend_compile_simple_var_no_cv /root/php/src/Zend/zend_compile.c:2636:2
    #249 0x1ee7114 in zend_compile_simple_var /root/php/src/Zend/zend_compile.c:2692:10
SUMMARY: AddressSanitizer: stack-overflow /tmp/final/llvm.src/projects/compiler-rt/lib/asan/asan_poisoning.h:55:5 in FastPoisonShadow
==18374==ABORTING

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 [2020-10-05 10:28 UTC] cmb@php.net
-Status: Open +Status: Duplicate -Type: Security +Type: Bug -Package: Unknown/Other Function +Package: Scripting Engine problem -Assigned To: +Assigned To: cmb
 [2020-10-05 10:28 UTC] cmb@php.net
This is basically a duplicate of bug #80183.
 
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