https://llvm.org/bugs/show_bug.cgi?id=25742
Bug ID: 25742
Summary: Use After Free Vulnerability lldb_private::Debugger
Product: lldb
Version: 3.4
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@lists.llvm.org
Reporter: ichai...@gmail.com
CC: llvm-b...@lists.llvm.org
Classification: Unclassified
Created attachment 15398
--> https://llvm.org/bugs/attachment.cgi?id=15398&action=edit
Proof-of-Concept for the crash
A use after free vulnerability exists in com.apple.LLDB.framework on Apple Mac
OS X 10.11.1 in LLDB version 340.4.110.1, that on exploitation, would allow an
attacker to execute arbitrary code with the privileges of the user.
Steps to reproduce:
~/D/A/t/lldbPython ❯❯❯ lldb
(lldb)script
Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D.
>>> import lldb
>>> s=lldb.SBDebugger.Create()
>>> s.__swig_destroy__(s)
>>> print s
Backtrace of the crash:
0 com.apple.LLDB.framework 0x0000000105c0ae0a
lldb::SBDebugger::GetDescription(lldb::SBStream&) + 28
1 com.apple.LLDB.framework 0x0000000105c5be4c
_wrap_SBDebugger___str__(_object*, _object*) + 128
2 org.python.python 0x0000000108ea0a0b PyEval_EvalFrameEx +
13400
3 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
4 org.python.python 0x0000000108e422e5 0x108e1a000 + 164581
5 org.python.python 0x0000000108e24202 PyObject_Call + 99
6 org.python.python 0x0000000108e2eff5 0x108e1a000 + 86005
7 org.python.python 0x0000000108e24202 PyObject_Call + 99
8 org.python.python 0x0000000108ea2e83
PyEval_CallObjectWithKeywords + 165
9 org.python.python 0x0000000108e6aa8f 0x108e1a000 + 330383
10 org.python.python 0x0000000108e53e17 _PyObject_Str + 127
11 org.python.python 0x0000000108e53eb0 PyObject_Str + 12
12 org.python.python 0x0000000108e53b70 0x108e1a000 + 236400
13 org.python.python 0x0000000108e3afb3 PyFile_WriteObject +
338
14 org.python.python 0x0000000108e9fb01 PyEval_EvalFrameEx +
9550
15 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
16 org.python.python 0x0000000108ea143e PyEval_EvalFrameEx +
16011
17 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
18 org.python.python 0x0000000108ea34ae 0x108e1a000 + 562350
19 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
20 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
21 org.python.python 0x0000000108ea34ae 0x108e1a000 + 562350
22 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
23 org.python.python 0x0000000108ea3541 0x108e1a000 + 562497
24 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
25 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
26 org.python.python 0x0000000108ea34ae 0x108e1a000 + 562350
27 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
28 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
29 org.python.python 0x0000000108ea34ae 0x108e1a000 + 562350
30 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
31 org.python.python 0x0000000108ea3541 0x108e1a000 + 562497
32 org.python.python 0x0000000108ea030c PyEval_EvalFrameEx +
11609
33 org.python.python 0x0000000108e9d3c1 PyEval_EvalCodeEx +
1583
34 org.python.python 0x0000000108e9cd8c PyEval_EvalCode + 54
35 org.python.python 0x0000000108ebca42 0x108e1a000 + 666178
36 org.python.python 0x0000000108ebcbff PyRun_StringFlags +
109
37 org.python.python 0x0000000108ebcb53
PyRun_SimpleStringFlags + 69
38 com.apple.LLDB.framework 0x00000001079e1cef
IOHandlerPythonInterpreter::Run() + 245
39 com.apple.LLDB.framework 0x00000001078e7b43
lldb_private::Debugger::ExecuteIOHandlers() + 63
40 com.apple.LLDB.framework 0x00000001079c89cc
lldb_private::CommandInterpreter::RunCommandInterpreter(bool, bool,
lldb_private::CommandInterpreterRunOptions&) + 126
41 com.apple.LLDB.framework 0x0000000105c0ca80
lldb::SBDebugger::RunCommandInterpreter(bool, bool) + 68
42 lldb 0x0000000105bdc05f Driver::MainLoop() +
2347
43 lldb 0x0000000105bdc594 main + 268
44 libdyld.dylib 0x00007fff9654e5ad start + 1
Please find the Proof-of-Concept attached as a python file.
Usage:
~/D/A/t/lldbPython ❯❯❯ python poc.py
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