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The Internet Systems Consortium's (ISC) Dynamic Host Configuration Protocol (DHCP) contained a vulnerability that introduced several potential buffer overflow conditions [VU#654390]. ISC DHCP makes use of the vsnprintf() function for writing various log file strings; vsnprintf() is defined in the Standard for Information Technology—Portable the Portable Operating System Interface (POSIX®POSIX^®), Base Specifications, Issue 7   [IEEE Std 1003.1:2013] as well as in the C Standard. For systems that do not support vsnprintf(), a C include file was created that defines the vsnprintf() function to vsprintf(), as shown in this noncompliant code example:

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Replacing secure functions with less secure functions is a very risky practice because developers can be easily fooled into trusting the function to perform a security check that is absent. This may be a concern, for example, as developers attempt to adopt more secure functions , such as the C11 Annex K functions, that might not be available on all platforms. (See VOID STR07-C. Use the bounds-checking interfaces for remediation of existing string manipulation code.)

Automated Detection

Related Vulnerabilities

Search for vulnerabilities resulting from the violation of this rule on the CERT website.

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 Bibliography

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