https://bugs.exim.org/show_bug.cgi?id=1988
Bug ID: 1988
Summary: PCRE2 10.23-RC1 - Global out of bounds read in
_pcre2_xclass_8()
Product: PCRE
Version: N/A
Hardware: x86
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 952
--> https://bugs.exim.org/attachment.cgi?id=952&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_pcre2_xclass_8 /dev/null
ASAN Output:
==18541==ERROR: AddressSanitizer: global-buffer-overflow on address
0x7fb410237e20 at pc 0x7fb410219aac bp 0x7ffd529a5500 sp 0x7ffd529a54f8
READ of size 2 at 0x7fb410237e20 thread T0
#0 0x7fb410219aab in _pcre2_xclass_8 XYZ/pcre/src/pcre2_xclass.c:136:30
#1 0x7fb4101c3ae1 in match XYZ/pcre/src/pcre2_match.c:3258:14
#2 0x7fb4101a12b3 in pcre2_match_8 XYZ/pcre/src/pcre2_match.c:6992:8
#3 0x4ef4cc in process_data XYZ/pcre/src/pcre2test.c:6576:9
#4 0x4ef4cc in main XYZ/pcre/src/pcre2test.c:7788
#5 0x7fb40f03882f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#6 0x41aad8 in _start (/usr/local/bin/pcre2test+0x41aad8)
0x7fb410237e20 is located 1280 bytes to the right of global variable
'_pcre2_ucd_stage2_8' defined in 'src/pcre2_ucd.c:1379:16' (0x7fb410228d20) of
size 60416
SUMMARY: AddressSanitizer: global-buffer-overflow
XYZ/pcre/src/pcre2_xclass.c:136:30 in _pcre2_xclass_8
Shadow bytes around the buggy address:
0x0ff70203ef70: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203ef80: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203ef90: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203efa0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203efb0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x0ff70203efc0: f9 f9 f9 f9[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203efd0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203efe0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203eff0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203f000: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0ff70203f010: 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
==18541==ABORTING
Regards,
Kamil Frankowicz
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