classification
Title: AddressSanitizer: SEGV on unknown address 0x7f4a36c604d0
Type: behavior Stage: resolved
Components: Extension Modules Versions: Python 3.6
process
Status: closed Resolution:
Dependencies: Superseder:
Assigned To: Nosy List: beginvuln
Priority: low Keywords:

Created on 2017-02-08 14:46 by beginvuln, last changed 2017-02-08 14:57 by matrixise. This issue is now closed.

Files
File name Uploaded Description Edit
ctypes_4748 beginvuln, 2017-02-08 14:46 PoC
Messages (1)
msg287323 - (view) Author: BeginVuln (beginvuln) Date: 2017-02-08 14:46
OS Version : Ubuntu 16.04 LTS
Python download link : https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tar.xz

Python version : 3.6.0

Normal build cmd : 
./configure 
make

Asan build cmd:
export CC="/usr/bin/clang -fsanitize=address
export CXX="/usr/bin/clang++ -fsanitize=address
./confiugre
make

GDB with exploitable:

To enable execution of this file add
	add-auto-load-safe-path /home/test/check/PythonGDB/python-gdb.py
line to your configuration file "/home/test/.gdbinit".
To completely disable this security protection add
	set auto-load safe-path /
line to your configuration file "/home/test/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual.  E.g., run from the shell:
	info "(gdb)Auto-loading safe path"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff5d87282 in Pointer_item (index=32767, myself=0x7ffff5b3b620) at /home/test/check/PythonGDB/Modules/_ctypes/_ctypes.c:4748
4748	    if (*(void **)self->b_ptr == NULL) {
Description: Access violation on destination operand
Short description: DestAv (8/22)
Hash: 6d733dd19a93baf3031238df7085b89d.f931e2f4bcacefcb07769ddcf0b1360f
Exploitability Classification: EXPLOITABLE
Explanation: The target crashed on an access violation at an address matching the destination operand of the instruction. This likely indicates a write access violation, which means the attacker may control the write address and/or value.
Other tags: AccessViolation (21/22)


ASAN:

ASAN:DEADLYSIGNAL
=================================================================
==18357==ERROR: AddressSanitizer: SEGV on unknown address 0x7f4a36c604d0 (pc 0x7f4a36e40562 bp 0x7ffc8c278530 sp 0x7ffc8c278060 T0)
    #0 0x7f4a36e40561 in Pointer_item /home/test/check/PythonASAN/Modules/_ctypes/_ctypes.c:4748
    #1 0x7f4a36e40561 in ?? ??:0
    #2 0x79987c in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:1458 (discriminator 1)
    #3 0x79987c in ?? ??:0
    #4 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #5 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #6 0x7a9847 in ?? ??:0
    #7 0x7ab648 in fast_function /home/test/check/PythonASAN/Python/ceval.c:4929 (discriminator 1)
    #8 0x7ab648 in ?? ??:0
    #9 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
    #10 0x7a76f2 in ?? ??:0
    #11 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #12 0x7995cc in ?? ??:0
    #13 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #14 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #15 0x7a9847 in ?? ??:0
    #16 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #17 0x7ac2ea in ?? ??:0
    #18 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #19 0x574668 in ?? ??:0
    #20 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #21 0x5749fa in ?? ??:0
    #22 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #23 0x573e9b in ?? ??:0
    #24 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
    #25 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
    #26 0x793369 in ?? ??:0
    #27 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #28 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #29 0x7a9847 in ?? ??:0
    #30 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #31 0x7ac2ea in ?? ??:0
    #32 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #33 0x574668 in ?? ??:0
    #34 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #35 0x5749fa in ?? ??:0
    #36 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #37 0x573e9b in ?? ??:0
    #38 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
    #39 0x66efe4 in ?? ??:0
    #40 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
    #41 0x5745f0 in ?? ??:0
    #42 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
    #43 0x7a7429 in ?? ??:0
    #44 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #45 0x7995cc in ?? ??:0
    #46 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #47 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #48 0x7a9847 in ?? ??:0
    #49 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #50 0x7ac2ea in ?? ??:0
    #51 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #52 0x574668 in ?? ??:0
    #53 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #54 0x5749fa in ?? ??:0
    #55 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #56 0x573e9b in ?? ??:0
    #57 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
    #58 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
    #59 0x793369 in ?? ??:0
    #60 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #61 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #62 0x7a9847 in ?? ??:0
    #63 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #64 0x7ac2ea in ?? ??:0
    #65 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #66 0x574668 in ?? ??:0
    #67 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #68 0x5749fa in ?? ??:0
    #69 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #70 0x573e9b in ?? ??:0
    #71 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
    #72 0x66efe4 in ?? ??:0
    #73 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
    #74 0x5745f0 in ?? ??:0
    #75 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
    #76 0x7a7429 in ?? ??:0
    #77 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #78 0x7995cc in ?? ??:0
    #79 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #80 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #81 0x7a9847 in ?? ??:0
    #82 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #83 0x7ac2ea in ?? ??:0
    #84 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #85 0x574668 in ?? ??:0
    #86 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #87 0x5749fa in ?? ??:0
    #88 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #89 0x573e9b in ?? ??:0
    #90 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
    #91 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
    #92 0x793369 in ?? ??:0
    #93 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #94 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #95 0x7a9847 in ?? ??:0
    #96 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #97 0x7ac2ea in ?? ??:0
    #98 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #99 0x574668 in ?? ??:0
    #100 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #101 0x5749fa in ?? ??:0
    #102 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #103 0x573e9b in ?? ??:0
    #104 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
    #105 0x66efe4 in ?? ??:0
    #106 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
    #107 0x5745f0 in ?? ??:0
    #108 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
    #109 0x7a7429 in ?? ??:0
    #110 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #111 0x7995cc in ?? ??:0
    #112 0x7ab4cb in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #113 0x7ab4cb in _PyFunction_FastCall /home/test/check/PythonASAN/Python/ceval.c:4870
    #114 0x7ab4cb in fast_function /home/test/check/PythonASAN/Python/ceval.c:4905
    #115 0x7ab4cb in ?? ??:0
    #116 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
    #117 0x7a76f2 in ?? ??:0
    #118 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #119 0x7995cc in ?? ??:0
    #120 0x7ab4cb in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #121 0x7ab4cb in _PyFunction_FastCall /home/test/check/PythonASAN/Python/ceval.c:4870
    #122 0x7ab4cb in fast_function /home/test/check/PythonASAN/Python/ceval.c:4905
    #123 0x7ab4cb in ?? ??:0
    #124 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
    #125 0x7a76f2 in ?? ??:0
    #126 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #127 0x7995cc in ?? ??:0
    #128 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #129 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #130 0x7a9847 in ?? ??:0
    #131 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
    #132 0x7ac2ea in ?? ??:0
    #133 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
    #134 0x574668 in ?? ??:0
    #135 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
    #136 0x5749fa in ?? ??:0
    #137 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
    #138 0x573e9b in ?? ??:0
    #139 0x6713f8 in slot_tp_init /home/test/check/PythonASAN/Objects/typeobject.c:6380
    #140 0x6713f8 in ?? ??:0
    #141 0x666d8d in type_call /home/test/check/PythonASAN/Objects/typeobject.c:915 (discriminator 1)
    #142 0x666d8d in ?? ??:0
    #143 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
    #144 0x5745f0 in ?? ??:0
    #145 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
    #146 0x7a7429 in ?? ??:0
    #147 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
    #148 0x7995cc in ?? ??:0
    #149 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
    #150 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
    #151 0x7a9847 in ?? ??:0
    #152 0x78e0df in PyEval_EvalCodeEx /home/test/check/PythonASAN/Python/ceval.c:4140
    #153 0x78e0df in PyEval_EvalCode /home/test/check/PythonASAN/Python/ceval.c:695
    #154 0x78e0df in ?? ??:0
    #155 0x5142f5 in run_mod /home/test/check/PythonASAN/Python/pythonrun.c:980
    #156 0x5142f5 in PyRun_FileExFlags /home/test/check/PythonASAN/Python/pythonrun.c:933
    #157 0x5142f5 in ?? ??:0
    #158 0x512afa in PyRun_SimpleFileExFlags /home/test/check/PythonASAN/Python/pythonrun.c:396
    #159 0x512afa in ?? ??:0
    #160 0x53eefd in run_file /home/test/check/PythonASAN/Modules/main.c:320
    #161 0x53eefd in Py_Main /home/test/check/PythonASAN/Modules/main.c:780
    #162 0x53eefd in ?? ??:0
    #163 0x503d16 in main /home/test/check/PythonASAN/./Programs/python.c:69
    #164 0x503d16 in ?? ??:0
    #165 0x7f4a3a79082f in __libc_start_main /build/glibc-GKVZIf/glibc-2.23/csu/../csu/libc-start.c:291
    #166 0x7f4a3a79082f in ?? ??:0
    #167 0x432548 in _start ??:?
    #168 0x432548 in ?? ??:0

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/test/check/PythonASAN/build/lib.linux-x86_64-3.6/_ctypes.cpython-36m-x86_64-linux-gnu.so+0x26561)
==18357==ABORTING
History
Date User Action Args
2017-02-08 14:57:25matrixisesetstatus: open -> closed
stage: resolved
2017-02-08 14:55:34christian.heimessetpriority: normal -> low
type: security -> behavior
components: + Extension Modules, - Interpreter Core
2017-02-08 14:46:24beginvulncreate