SEI CERT C Coding Standard

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Information for Editors
In order to have a new guideline automatically listed above be sure to label it env and rule.

Risk Assessment Summary

Rule

Severity

Likelihood

Remediation Cost

Priority

Level

ENV30-CLowProbableMedium

P4

L3

ENV31-CLowProbableMedium

P4

L3

ENV32-CMediumLikelyMedium

P12

L1

ENV33-CHighProbableMedium

P12

L1

ENV34-CLowProbableMedium

P4

L3

Related Rules and Recommendations

ENV00-J. Do not sign code that performs only unprivileged operations
ENV01-C. Do not make assumptions about the size of an environment variable
ENV01-J. Place all security-sensitive code in a single JAR and sign and seal it
ENV02-C. Beware of multiple environment variables with the same effective name
ENV02-J. Do not trust the values of environment variables
ENV03-C. Sanitize the environment when invoking external programs
ENV03-J. Do not grant dangerous combinations of permissions
ENV04-J. Do not disable bytecode verification
ENV05-J. Do not deploy an application that can be remotely monitored
ENV06-J. Production code must not contain debugging entry points
ENV30-C. Do not modify the object referenced by the return value of certain functions
ENV31-C. Do not rely on an environment pointer following an operation that may invalidate it
ENV32-C. All exit handlers must return normally
ENV33-C. Do not call system()
ENV34-C. Do not store pointers returned by certain functions
Rec. 10. Environment (ENV)
Rule 10. Environment (ENV)
Rule 16. Runtime Environment (ENV)

1 Comment

  1. Casey Klimasauskas

    Do NOT modify the TZ enviornment as part of a hack to convert date/time from one time zone to another.

    I spent several days tracking down a bug in a production environment with a multi-threaded application in which conversion between time zones was done by setting the TZ environment variable to one time zone, getting local time, then changing to another time zone to get an ascii string to store the information in a database. Other portions of the code accessed the time functions to find the current time (assumed) local time. Depending on race conditions, this occasionally resulted in incorrect times. This is a published hack that should NOT be used. Use Boost or similar library instead.