Difference between revisions of "Searching for Code in J2EE/Java"

Revision as of 12:54, 11 January 2009

OWASP Code Review Guide Table of Contents

Input and Output Streams

These are used to read data into one’s application. They may be potential entry points into an application. The entry points may be from an external source and must be investigated. These may also be used in path traversal attacks or DoS attacks.

Java.io
java.util.zip
java.util.jar
FileInputStream
ObjectInputStream
FilterInputStream
PipedInputStream
SequenceInputStream
StringBufferInputStream
BufferedReader
ByteArrayInputStream
CharArrayReader
File
ObjectInputStream
PipedInputStream
StreamTokenizer
getResourceAsStream
java.io.FileReader
java.io.FileWriter
java.io.RandomAccessFile
java.io.File
java.io.FileOutputStream
mkdir
renameTo

Servlets

These API calls may be avenues for parameter, header, URL, and cookie tampering, HTTP Response Splitting and information leakage. They should be examined closely as many of such APIs obtain the parameters directly from HTTP requests.

javax.servlet.*
getParameterNames
getParameterValues
getParameter
getParameterMap
getScheme
getProtocol
getContentType
getServerName
getRemoteAddr
getRemoteHost
getRealPath
getLocalName
getAttribute
getAttributeNames
getLocalAddr
getAuthType
getRemoteUser
getCookies
isSecure
HttpServletRequest
getQueryString
getHeaderNames
getHeaders
getPrincipal
getUserPrincipal
isUserInRole
getInputStream
getOutputStream
getWriter
addCookie
addHeader
setHeader
setAttribute
putValue
javax.servlet.http.Cookie
getName
getPath
getDomain
getComment
getMethod
getPath
getReader
getRealPath
getRequestURI
getRequestURL
getServerName
getValue
getValueNames
getRequestedSessionId

Cross Site Scripting

javax.servlet.ServletOutputStream.print
javax.servlet.jsp.JspWriter.print
java.io.PrintWriter.print

Response Splitting

javax.servlet.http.HttpServletResponse.sendRedirect
addHeader, setHeader

Redirection

sendRedirect
setStatus
addHeader, setHeader

SQL & Database

Searching for Java Database related code this list should help you pinpoint classes/methods which are involved in the persistence layer of the application being reviewed.

jdbc
executeQuery
select
insert
update
delete
execute
executestatement
createStatement
java.sql.ResultSet.getString
java.sql.ResultSet.getObject
java.sql.Statement.executeUpdate
java.sql.Statement.executeQuery
java.sql.Statement.execute
java.sql.Statement.addBatch
java.sql.Connection.prepareStatement
java.sql.Connection.prepareCall

SSL

Looking for code which utilises SSL as a medium for point to point encryption. The following fragments should indicate where SSL functionality has been developed.

com.sun.net.ssl
SSLContext
SSLSocketFactory
TrustManagerFactory
HttpsURLConnection
KeyManagerFactory

Session Management

getSession
invalidate
getId

Legacy Interaction

Here we may be vulnerable to command injection attacks or OS injection attacks. Java linking to the native OS can cause serious issues and potentially give rise to total server compromise.

java.lang.Runtime.exec
java.lang.Runtime.getRuntime

Logging

We may come across some information leakage by examining code below contained in one’s application.

java.io.PrintStream.write
log4j
jLo
Lumberjack
MonoLog
qflog
just4log
log4Ant
JDLabAgent

Architectural Analysis

If we can identify major architectural components within that application (right away) it can help narrow our search, and we can then look for known vulnerabilities in those components and frameworks:

### Ajax 

XMLHTTP

1. 1. 1. Struts
         

org.apache.struts

1. 1. 1. Spring
         

org.springframework

1. 1. 1. Java Server Faces (JSF)
         

import javax.faces

1. 1. 1. Hibernate
         

import org.hibernate

1. 1. 1. Castor
         

org.exolab.castor

1. 1. 1. JAXB
         

javax.xml

1. 1. 1. JMS
         

JMS