This code checks the length of a path against a minimum and maximum size in Java

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Example 523 This code checks the length of a path against a minimum and maximum size
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if (path != null && pathlength() > 0 && pathlength() <= MAXPATH) { fileOperation(path); }
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Example 524 This example uses a regular expression to check against a whitelist and verify input length at the same time
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// limit character content, // also limit length to between 1 and MAXPATH final String PATH_REGEX = "[a-zA-Z0-9/]{1,"+MAXPATH+"}"; final Pattern PATH_PATTERN = Patterncompile(PATH_REGEX); if (path != null && PATH_PATTERNmatcher(path)matches()) { fileOperation(path); }
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A common argument used to justify the absence of explicit bounds on the length of input accepted is that safe languages such as Java do not carry the inherent buffer over ow risks that C and C++ do This is a partial truth Because Java Web applications frequently act as front ends to legacy systems or call into native code libraries using JNI, even though unbounded input might not directly lead to a vulnerability in Java code, it can easily lead to an exploit in an area of the system implemented in another language Missing bounds checks in a Java application can make it an ideal transmitter for a buffer over ow payload
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Unbounded Input: A Vulnerability Rosetta Stone for C, C++, and Java
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One of the most widely acknowledged buffer over ow pitfalls in the C language is the function gets() A call to gets() is a guaranteed buffer over ow vulnerability because it requires the programmer to pass in a xed-size buffer, but it doesn t place any limits on the amount of data it writes into the buffer The following two lines of C code are a sure- re disaster By allocating an array on the stack and then calling gets(), the program is a perfect setup for a stack buffer over ow:
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char buf[128]; gets(buf);
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The problem with gets() is so widely acknowledged that some compilers automatically emit a warning when they see it used Systems such as Mac OS X display a warning message when a program that calls gets() runs:
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warning: this program uses gets(), which is unsafe
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Continued The creators of C++ provided a direct translation of the gets() functionality into C++ syntax, vulnerability and all The following two lines of C++ are just as vulnerable as a call to gets():
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char buf[128]; cin >> buf;
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Because the C++ problem is so faithful to the gets() problem, we nd it odd that none of the compilers or runtime environments that we are aware of will give a warning about the danger inherent in this code C++ does provide a much better option By reading into a string object instead of a character array, the buffer over ow problem disappears because the string object automatically allocates enough space to hold the input:
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string str; cin >> str;
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But we re not out of the woods yet Although the buffer over ow problem is gone, the code still doesn t place any limit on the amount of input it will accept That makes it easy for an attacker to force a low-memory or out-of-memory condition on the program Although the means of exploiting such a condition are not as obvious as with a buffer over ow, many programs can, at the very least, be forced to crash when they butt up against a memory limitation The attacker might also take advantage of this code simply to slow the program down Introducing lag is a great prelude to exploiting a bug related to time and state Java does bounds checking and enforces type safety, so buffer over ow is not a scourge in Java the way it is in C and C++, and there is no direct analog to the gets() problem But just as with C++, Java provides an all-too-convenient way to read an unbounded amount of input into a string:
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And just as with C++, an attacker can exploit this code to cause a low-memory condition from which many programs will have a hard time recovering We are fascinated by the similarity of the problems built into the libraries for these programming languages It would appear that input-length checks are not a priority among language designers, so, in addition to avoiding the traps, you should expect you ll need design your own security-enhanced APIs
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