when compiled in environments that do not provide the vsnprintf
function, uses C include files that define vsnprintf to use the less
safe vsprintf function
Posting date: 22 Jun 2004
ISC DHCP makes use of the vsnprintf() function
for writing various log file strings. For systems that do not support
vsnprintf(), a C include file was created that defines the vsnprintf()
function to vsprintf() as such:
#define vsnprintf(buf, size, fmt, list) vsprintf (buf, fmt, list)
vsprintf() is a function that does not check bounds, therefore the
size is discarded creating the potential for a buffer overflow when
client provided data is supplied. Note that the vsnprintf() statements
are defined after the vulnerable code that is discussed in VU#317350.
This means that VU#317350 would be triggered prior to these potential
buffer overflows, unless a client could specify content to a vsnprintf()
statement not associated with logging. It is believed that there aren't
any other vsnprintf() statements vulnerable to this type of
None known at this time.
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Note: ISC patches only currently supported versions. When possible we indicate EOL versions affected.
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This Knowledge Base article https://kb.isc.org/article/AA-00960 is the complete and official security advisory document.
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