Re: Thousands of vulnerabilities, almost no CVEs: OSS-Fuzz

[Bob Friesenhahn <bfriesen () simple dallas tx us>]

On Mon, 24 Jun 2019, Alexander Potapenko wrote:
> > Most oss-fuzz issue detections are not CVE worthy.  For example, a
> > one-byte read "heap overflow" is not likely to cause any actual harm
> > but oss-fuzz would classify it as "heap overflow".
> There's enough information in the report though to assign the severity
> score depending on the access size, its type (read or write) the call
> stack etc.
> OSS-Fuzz deliberately doesn't do that now, but such scoring can be
> done to prune the list of potential CVE candidates.

Oss-fuzz does not take into account the important criteria which is 
the actual underlying size of the heap allocation.  It is true that 
this is implementation specific, but if the underlying heap allocation 
is larger than the requested allocation, the program might not be 
vulnerable.

Bob
--
Bob Friesenhahn
bfriesen () simple dallas tx us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt