https://bugs.exim.org/show_bug.cgi?id=1915
Bug ID: 1915
Summary: Global Variable Buffer Overflow in pcre2test
Product: PCRE
Version: N/A
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: p...@hermes.cam.ac.uk
Reporter: fumfi....@gmail.com
CC: pcre-dev@exim.org
Created attachment 935
--> https://bugs.exim.org/attachment.cgi?id=935&action=edit
POC to trigger global buffer overflow (pcre2test)
Affected:
- pcre2test in PCRE2 version 10.23-RC1 2016-08-01 (SVN revision: 597)
- pcre2test in PCRE2 version 10.22 (Faulty code line: pcre2test.c:3510)
To reproduce the problem (pcre2test):
pcre2test pcre2test_gbo /dev/null
ASAN Output (SVN Revision: 593):
==21946==ERROR: AddressSanitizer: global-buffer-overflow on address
0x0000013c85f8 at pc 0x0000004fdfa8 bp 0x7ffe4d81ef70 sp 0x7ffe4d81ef68
WRITE of size 1 at 0x0000013c85f8 thread T0
#0 0x4fdfa7 in decode_modifiers XYZ/pcre/src/pcre2test.c:3564:17
#1 0x4ed5b1 in process_data XYZ/pcre/src/pcre2test.c:6032:20
#2 0x4ed5b1 in main XYZ/pcre/src/pcre2test.c:7745
#3 0x7f8f4372482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#4 0x41aa78 in _start (/usr/local/bin/pcre2test+0x41aa78)
0x0000013c85f8 is located 0 bytes to the right of global variable 'dat_datctl'
defined in 'src/pcre2test.c:818:15' (0x13c84a0) of size 344
SUMMARY: AddressSanitizer: global-buffer-overflow
XYZ/pcre/src/pcre2test.c:3564:17 in decode_modifiers
Shadow bytes around the buggy address:
0x000080271060: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
0x000080271070: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9
0x000080271080: f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9 01 f9 f9 f9
0x000080271090: f9 f9 f9 f9 00 00 00 00 00 00 00 00 00 00 00 00
0x0000802710a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0000802710b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00[f9]
0x0000802710c0: f9 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 00
0x0000802710d0: 00 00 00 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9
0x0000802710e0: 00 f9 f9 f9 f9 f9 f9 f9 04 f9 f9 f9 f9 f9 f9 f9
0x0000802710f0: 01 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9
0x000080271100: 04 f9 f9 f9 f9 f9 f9 f9 04 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
==21946==ABORTING
Regards,
Kamil Frankowicz
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