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
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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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