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Do not make any assumptions about the size of environment variables, as an adversary could have full control over the environment. Calculate the length of the strings yourself, and dynamically allocate memory for your copies \[[STR31-C. Guarantee that storage for strings has sufficient space for character data and the nullNULL terminator]\]. |
Non-Compliant Code Example
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Search for vulnerabilities resulting from the violation of this rule on the CERT website.
References
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\[[ISO/IEC 9899-1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.20.4, "Communication with the environment" \[[Open Group 04|AA. C References#Open Group 04]\] Chapter 8, "Environment Variables" \[[Viega 03|AA. C References#Viega 03]\] Section 3.6, "Using Environment Variables Securely" |