https://bugs.exim.org/show_bug.cgi?id=2766
Bug ID: 2766
Summary: pcretest.c in PCRE before 8.44 allows remote
attackers to cause a denial of service (heap-based
buffer overflow)
Product: PCRE
Version: 8.44
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Documentation
Assignee: Philip.Hazel@???
Reporter: 670605832@???
CC: pcre-dev@???
Hello, We found a heap-based buffer overflow bug in the pcretest.c(PCRE before
8.44) , .
How to Reproduce: cat poc | ./pcretest
==33844==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62d000012400 at pc 0x0000004023a7 bp 0x7ffd101463a0 sp 0x7ffd10146390
READ of size 1 at 0x62d000012400 thread T0
#0 0x4023a6 in pchars /pcre-8.44/pcretest.c:2045
#1 0x402a00 in callout /pcre-8.44/pcretest.c:2272
#2 0x441f37 in internal_dfa_exec /pcre-8.44/pcre_dfa_exec.c:3080
#3 0x444121 in pcre_dfa_exec /pcre-8.44/pcre_dfa_exec.c:3618
#4 0x40d1b1 in main /pcre-8.44/pcretest.c:5214
#5 0x7f917c87983f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
#6 0x4019d8 in _start (/pcre-8.44/pcretest+0x4019d8)
0x62d000012400 is located 0 bytes to the right of 32768-byte region
[0x62d00000a400,0x62d000012400)
allocated by thread T0 here:
#0 0x7f917ccbb961 in realloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98961)
#1 0x40a3d0 in main /pcre-8.44/pcretest.c:4593
#2 0x7f917c87983f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
SUMMARY: AddressSanitizer: heap-buffer-overflow /pcre-8.44/pcretest.c:2045
pchars
Shadow bytes around the buggy address:
0x0c5a7fffa430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a7fffa480:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa490: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4d0: 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
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
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
==33844==ABORTING
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