Assignment of a Fixed Address to a Pointer

The software sets a pointer to a specific address other than NULL or 0.


Description

Using a fixed address is not portable because that address will probably not be valid in all environments or platforms.

Demonstrations

The following examples help to illustrate the nature of this weakness and describe methods or techniques which can be used to mitigate the risk.

Note that the examples here are by no means exhaustive and any given weakness may have many subtle varieties, each of which may require different detection methods or runtime controls.

Example One

This code assumes a particular function will always be found at a particular address. It assigns a pointer to that address and calls the function.

int (*pt2Function) (float, char, char)=0x08040000;
int result2 = (*pt2Function) (12, 'a', 'b');
// Here we can inject code to execute.

The same function may not always be found at the same memory address. This could lead to a crash, or an attacker may alter the memory at the expected address, leading to arbitrary code execution.

See Also

SEI CERT C Coding Standard - Guidelines 04. Integers (INT)

Weaknesses in this category are related to the rules and recommendations in the Integers (INT) section of the SEI CERT C Coding Standard.

SFP Secondary Cluster: Glitch in Computation

This category identifies Software Fault Patterns (SFPs) within the Glitch in Computation cluster (SFP1).

CERT C++ Secure Coding Section 04 - Integers (INT)

Weaknesses in this category are related to rules in the Integers (INT) section of the CERT C++ Secure Coding Standard. Since not all rules map to specific weaknesses, ...

Comprehensive CWE Dictionary

This view (slice) covers all the elements in CWE.

CWE Cross-section

This view contains a selection of weaknesses that represent the variety of weaknesses that are captured in CWE, at a level of abstraction that is likely to be useful t...

Weaknesses Introduced During Implementation

This view (slice) lists weaknesses that can be introduced during implementation.


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