https://bugs.exim.org/show_bug.cgi?id=2108
Bug ID: 2108
Summary: Heap out of bounds read in match()
Product: PCRE
Version: 10.23 (PCRE2)
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: fumfi.255@???
CC: pcre-dev@???
Created attachment 1014
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https://bugs.exim.org/attachment.cgi?id=1014&action=edit
POC to trigger heap out of bounds read (pcre2test)
Affected:
- PCRE2 version 10.23 (SVN rev: 760)
To reproduce the problem (pcre2test):
pcre2test pcre2_hoobr_match /dev/null
ASAN:
==25520==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6290000051ff at pc 0x7f6d8f592b5b bp 0x7fffcec66470 sp 0x7fffcec66468
READ of size 1 at 0x6290000051ff thread T0
#0 0x7f6d8f592b5a in match XYZ/pcre/src/pcre2_match.c:1968:13
#1 0x7f6d8f5326e4 in pcre2_match_8 XYZ/pcre/src/pcre2_match.c:6644:8
#2 0x4fb54c in process_data XYZ/pcre/src/pcre2test.c:6808:9
#3 0x4ea545 in main XYZ/pcre/src/pcre2test.c:8045:12
#4 0x7f6d8e3c882f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#5 0x41acd8 in _start (/usr/local/bin/pcre2test+0x41acd8)
0x6290000051ff is located 1 bytes to the left of 16384-byte region
[0x629000005200,0x629000009200)
allocated by thread T0 here:
#0 0x4b989e in realloc
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:77:3
#1 0x4f7627 in process_data XYZ/pcre/src/pcre2test.c:5972:24
#2 0x4ea545 in main XYZ/pcre/src/pcre2test.c:8045:12
#3 0x7f6d8e3c882f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
SUMMARY: AddressSanitizer: heap-buffer-overflow
XYZ/pcre/src/pcre2_match.c:1968:13 in match
Shadow bytes around the buggy address:
0x0c527fff89e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff89f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff8a00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff8a10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff8a20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c527fff8a30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
0x0c527fff8a40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff8a50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff8a60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff8a70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff8a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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
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
Left alloca redzone: ca
Right alloca redzone: cb
==25520==ABORTING
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