https://bugs.exim.org/show_bug.cgi?id=1904
Bug ID: 1904 Summary: PCRE2 10.23-RC1 - Heap Buffer Overflow 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 933 --> https://bugs.exim.org/attachment.cgi?id=933&action=edit POC to trigger heap overflow (pcre2test) PCRE2 library is prone to a vulnerability which leads to Heap Overflow. Affected: - PCRE2 version 10.23-RC1 2016-08-01 (SVN revision: 573) To reproduce the problem (pcre2test): pcre2test heap_overflow2_573 /dev/null ASAN output: ==32003==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x611000009fe7 at pc 0x7f2cf460968d bp 0x7ffc3cf954f0 sp 0x7ffc3cf954e8 WRITE of size 1 at 0x611000009fe7 thread T0 #0 0x7f2cf460968c in compile_branch XYZ/pcre/src/pcre2_compile.c:7239:13 #1 0x7f2cf460968c in compile_regex XYZ/pcre/src/pcre2_compile.c:7422 #2 0x7f2cf45f7f62 in pcre2_compile_8 XYZ/pcre/src/pcre2_compile.c:9297:7 #3 0x4edf58 in process_pattern XYZ/pcre/src/pcre2test.c:5033:1 #4 0x4edf58 in main XYZ/pcre/src/pcre2test.c:7739 #5 0x7f2cf34eb82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #6 0x41a828 in _start (/usr/local/bin/pcre2test+0x41a828) 0x611000009fe7 is located 0 bytes to the right of 231-byte region [0x611000009f00,0x611000009fe7) allocated by thread T0 here: #0 0x4b903c in __interceptor_malloc /home/development/llvm/3.9.0/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:64:3 #1 0x4f048e in my_malloc XYZ/pcre/src/pcre2test.c:2380:15 #2 0x7f2cf45f7716 in pcre2_compile_8 XYZ/pcre/src/pcre2_compile.c:9230:3 #3 0x4edf58 in process_pattern XYZ/pcre/src/pcre2test.c:5033:1 #4 0x4edf58 in main XYZ/pcre/src/pcre2test.c:7739 #5 0x7f2cf34eb82f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) SUMMARY: AddressSanitizer: heap-buffer-overflow XYZ/pcre/src/pcre2_compile.c:7239:13 in compile_branch Shadow bytes around the buggy address: 0x0c227fff93a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff93e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x0c227fff93f0: 00 00 00 00 00 00 00 00 00 00 00 00[07]fa fa fa 0x0c227fff9400: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9410: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9420: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9430: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 0x0c227fff9440: 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 Left alloca redzone: ca Right alloca redzone: cb ==32003==ABORTING Regards, Kamil Frankowicz -- You are receiving this mail because: You are on the CC list for the bug. -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev