[pcre-dev] [Bug 1985] New: PCRE2 10.23-RC1 - Global out of b…

https://bugs.exim.org/show_bug.cgi?id=1985

            Bug ID: 1985
           Summary: PCRE2 10.23-RC1 - Global out of bounds read in match()
           Product: PCRE
           Version: N/A
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Code
          Assignee: ph10@???
          Reporter: fumfi.255@???
                CC: pcre-dev@???

Created attachment 949
--> https://bugs.exim.org/attachment.cgi?id=949&action=edit
POC to trigger global out of bounds read (pcre2test)

Affected:
- PCRE2 version 10.23-RC1 2016-08-01 (SVN revision: 610)

To reproduce the problem (pcre2test):
pcre2test pcre2_goobr_match /dev/null

ASAN Output:

==22854==ERROR: AddressSanitizer: global-buffer-overflow on address
0x7fce13d5d4a0 at pc 0x7fce13d2e3cb bp 0x7fff64d192b0 sp 0x7fff64d192a8
READ of size 1 at 0x7fce13d5d4a0 thread T0
    #0 0x7fce13d2e3ca in match /XYZ/pcre/src/pcre2_match.c:2739:13
    #1 0x7fce13cd62b3 in pcre2_match_8 /XYZ/pcre/src/pcre2_match.c:6992:8
    #2 0x4ef4cc in process_data /XYZ/pcre/src/pcre2test.c:6576:9
    #3 0x4ef4cc in main /XYZ/pcre/src/pcre2test.c:7788
    #4 0x7fce12b6d82f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #5 0x41aad8 in _start (/usr/local/bin/pcre2test+0x41aad8)

0x7fce13d5d4a0 is located 0 bytes to the right of global variable
'_pcre2_ucd_stage1_8' defined in 'src/pcre2_ucd.c:832:15' (0x7fce13d5b2a0) of
size 8704
SUMMARY: AddressSanitizer: global-buffer-overflow
/XYZ/pcre/src/pcre2_match.c:2739:13 in match
Shadow bytes around the buggy address:
  0x0ffa427a3a40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffa427a3a50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffa427a3a60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffa427a3a70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffa427a3a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0ffa427a3a90: 00 00 00 00[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0ffa427a3aa0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0ffa427a3ab0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0ffa427a3ac0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0ffa427a3ad0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0ffa427a3ae0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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
==22854==ABORTING

Regards,
Kamil Frankowicz

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