[pcre-dev] [Bug 1977] New: PCRE 10.23-RC1 - Null pointer de…

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A: pcre-dev
Assumpte: [pcre-dev] [Bug 1977] New: PCRE 10.23-RC1 - Null pointer dereference in _pcre2_check_escape_8()
https://bugs.exim.org/show_bug.cgi?id=1977

            Bug ID: 1977
           Summary: PCRE 10.23-RC1 - Null pointer dereference in
                    _pcre2_check_escape_8()
           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 941
--> https://bugs.exim.org/attachment.cgi?id=941&action=edit
POC to trigger null ptr dereference (pcre2test)

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

To reproduce the problem (pcre2test):
pcre2test pcre2_null_ptr_deref_check_escape_8 /dev/null

==18582==ERROR: AddressSanitizer: SEGV on unknown address 0x0000000000d2 (pc
0x7f7e16d1120b bp 0x00000000000f sp 0x7ffca93b0b00 T0)
==18582==The signal is caused by a WRITE memory access.
==18582==Hint: address points to the zero page.
    #0 0x7f7e16d1120a in _pcre2_check_escape_8 XYZ/src/pcre2_compile.c:1409:26
    #1 0x7f7e16de440a in pcre2_substitute_8 XYZ/src/pcre2_substitute.c:734:12
    #2 0x4f3b1f in process_data XYZ/src/pcre2test.c:6409:3
    #3 0x4f3b1f in main XYZ/src/pcre2test.c:7788
    #4 0x7f7e15c0e82f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #5 0x41aad8 in _start (/usr/local/bin/pcre2test+0x41aad8)


AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV XYZ/src/pcre2_compile.c:1409:26 in
_pcre2_check_escape_8
==18582==ABORTING

Regards,
Kamil Frankowicz

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