https://bugs.exim.org/show_bug.cgi?id=2778
Bug ID: 2778
Summary: pchars (pcretest.c:2045) in PCRE8.45 can cause
heap-buffer-overflow.
Product: PCRE
Version: 8.45
Hardware: x86
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: Philip.Hazel@???
Reporter: 670605832@???
CC: pcre-dev@???
==8248==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62d000008400
at pc 0x00000052a0a6 bp 0x7ffd4e81eea0 sp 0x7ffd4e81ee98
READ of size 1 at 0x62d000008400 thread T0
#0 0x52a0a5 in pchars /pcre-CVE-2017-7186/pcretest.c:2045:7
#1 0x52b04a in callout /pcre-CVE-2017-7186/pcretest.c:2272:9
#2 0x5b17e1 in internal_dfa_exec
/pcre-CVE-2017-7186/pcre_dfa_exec.c:3080:20
#3 0x58d425 in pcre_dfa_exec /pcre-CVE-2017-7186/pcre_dfa_exec.c:3618:8
#4 0x522479 in main /pcre-CVE-2017-7186/pcretest.c:5214:9
#5 0x7f40690b482f in __libc_start_main
/build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
#6 0x419c88 in _start (/pcre-CVE-2017-7186/pcretest+0x419c88)
0x62d000008400 is located 0 bytes to the right of 32768-byte region
[0x62d000000400,0x62d000008400)
allocated by thread T0 here:
#0 0x4d2718 in realloc
/fuzzer/build/llvm_tools/llvm-4.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:79
#1 0x51b762 in main /pcre-CVE-2017-7186/pcretest.c:4593:31
#2 0x7f40690b482f in __libc_start_main
/build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
SUMMARY: AddressSanitizer: heap-buffer-overflow
/pcre-CVE-2017-7186/pcretest.c:2045:7 in pchars
Shadow bytes around the buggy address:
0x0c5a7fff9030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a7fff9080:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff9090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa==8248==ERROR:
AddressSanitizer: heap-buffer-overflow on address 0x62d000008400 at pc
0x00000052a0a6 bp 0x7ffd4e81eea0 sp 0x7ffd4e81ee98
READ of size 1 at 0x62d000008400 thread T0
#0 0x52a0a5 in pchars /pcre-CVE-2017-7186/pcretest.c:2045:7
#1 0x52b04a in callout /pcre-CVE-2017-7186/pcretest.c:2272:9
#2 0x5b17e1 in internal_dfa_exec
/pcre-CVE-2017-7186/pcre_dfa_exec.c:3080:20
#3 0x58d425 in pcre_dfa_exec /pcre-CVE-2017-7186/pcre_dfa_exec.c:3618:8
#4 0x522479 in main /pcre-CVE-2017-7186/pcretest.c:5214:9
#5 0x7f40690b482f in __libc_start_main
/build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
#6 0x419c88 in _start (/pcre-CVE-2017-7186/pcretest+0x419c88)
0x62d000008400 is located 0 bytes to the right of 32768-byte region
[0x62d000000400,0x62d000008400)
allocated by thread T0 here:
#0 0x4d2718 in realloc
/fuzzer/build/llvm_tools/llvm-4.0.0.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:79
#1 0x51b762 in main /pcre-CVE-2017-7186/pcretest.c:4593:31
#2 0x7f40690b482f in __libc_start_main
/build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:291
SUMMARY: AddressSanitizer: heap-buffer-overflow
/pcre-CVE-2017-7186/pcretest.c:2045:7 in pchars
Shadow bytes around the buggy address:
0x0c5a7fff9030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c5a7fff9070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c5a7fff9080:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff9090: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c5a7fff90d0: 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
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
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
==8248==ABORTING
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