https://bugs.exim.org/show_bug.cgi?id=2226
Bug ID: 2226
Summary: heap overflow in match src/pcre_exec.c:2311
Product: PCRE
Version: 8.41
Hardware: x86
OS: All
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: simo.ghannam@???
CC: pcre-dev@???
Created attachment 1065
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https://bugs.exim.org/attachment.cgi?id=1065&action=edit
file triggering the bug
Hi,
I found this bug by fuzzing pcre 8.41
here is the output of ASAN compiled library
_____________________________________________________________
./pcretest reg.txt
PCRE version 8.41 2017-07-05
PCRE version 8.41 2017-07-05
/./<CRLF>
\P
=================================================================
==45618==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62d000012400 at pc 0x0000004a8d4e bp 0x7ffc36043d00 sp 0x7ffc36043cf0
READ of size 1 at 0x62d000012400 thread T0
#0 0x4a8d4d in match /works/f/pcre-8.41_test/pcre_exec.c:2311
#1 0x4b284c in pcre_exec /works/f/pcre-8.41_test/pcre_exec.c:6936
#2 0x40ca9f in main /works/f/pcre-8.41_test/pcretest.c:5227
#3 0x7f89b4d151c0 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x211c0)
#4 0x414919 in _start (/works/f/pcre-8.41_test/pcretest+0x414919)
0x62d000012400 is located 0 bytes to the right of 32768-byte region
[0x62d00000a400,0x62d000012400)
allocated by thread T0 here:
#0 0x7f89b516c961 in realloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98961)
#1 0x407dad in main /works/f/pcre-8.41_test/pcretest.c:4593
SUMMARY: AddressSanitizer: heap-buffer-overflow
/works/f/pcre-8.41_test/pcre_exec.c:2311 match
Shadow bytes around the buggy address:
0x0c5a7fffa430: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fffa470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a7fffa480:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa490: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fffa4d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
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
==45618==ABORTING
_____________________________________________________________
Valgrind output :
PCRE version 8.41 2017-07-05
/./<CRLF>
\P
==45731== Invalid read of size 1
==45731== at 0x8080623: match (pcre_exec.c:2311)
==45731== by 0x807A578: pcre_exec (pcre_exec.c:6936)
==45731== by 0x80524F0: main (pcretest.c:5227)
==45731== Address 0x426fe68 is 0 bytes after a block of size 32,768 alloc'd
==45731== at 0x402F17C: malloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==45731== by 0x4031370: realloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==45731== by 0x804E787: main (pcretest.c:4593)
==45731==
Cheers,
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