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JavaScript Memory Leaks - Accidental global variable

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JavaScript Memory Leaks - Accidental global variable

Severity
4
CVSS
(AV:N/AC:L/Au:M/C:P/I:N/A:N)
Published
01/01/2017
Created
07/25/2018
Added
06/27/2018
Modified
06/27/2018

Description

Global variables are easily leaked in Javascript. You may consider the following javascript code used in the default, non-strict mode: 

      function f(){       Token = 1;      }      f();      console.log("I can still see Token: " + Token);
]]> The default, non-strict mode allows some relatively "unsafe" actions to be taken, and it allows some code mistakes that make it difficult for JavaScript engines to perform optimizations.

Solution(s)

  • javascriptcheck-javascriptleaks-r01

References

  • 316

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