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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, which ; vsnprintf() is defined in the Open Group the Standard for Information Technology—Portable Operating System Interface (POSIX®), Base Specifications, Issue 6 [Open Group 20047 [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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