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Revision as of 13:01, 29 May 2009

This is a Vulnerability. To view all vulnerabilities, please see the Vulnerability Category page.

Last revision (mm/dd/yy): 05/29/2009

Vulnerabilities Table of Contents


In many languages, the compare statement is very close in appearance to the assignment statement and are often confused.

This bug is generally a result of a typo and usually should cause obvious problems with program execution. If the comparison is in an if statement, the if statement will always return the value of the right-hand side variable.



Exposure period

  • Pre-design through Build: The use of tools to detect this problem is recommended.
  • Implementation: Many logic errors can lead to this condition. It can be exacerbated by lack, or misuse, of mitigating technologies.


  • Languages: C, C++
  • Operating platforms: Any

Required resources




Likelihood of exploit


Risk Factors



In C/C++/Java:

void called(int foo){
        if (foo=1)  printf("foo\n");

int main(){
        return 0;

Related Attacks


Related Vulnerabilities

Related Controls


  • Control 1
  • Control 2
  • Pre-design: Through Build: Many IDEs and static analysis products will detect this problem.
  • Implementation: Place constants on the left. If one attempts to assign a constant with a variable, the compiler will of course produce an error.

Related Technical Impacts