Date: Tue, 8 Dec 2020 17:18:04 -0500 From: Robert Watson <robertcwatson1@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Bugs found by Cryptofuzz - some missing CVEs or too low impact for CVE? Question from a retired programmer but security novice... Since fuzzing is used to find bugs in other programs, doesn't it need to be held to a bit higher standard in order to maintain credibility? On Tue, Dec 8, 2020, 16:12 Eric Biggers <ebiggers@...nel.org> wrote: > On Tue, Dec 08, 2020 at 08:01:14PM +0100, yersinia wrote: > > At this link, multiple security bugs of various kinds are highlighted in > > very widespread basic cryptographic applications, which have then been > > corrected. I haven't done a deep analysis on all of them but I haven't > > found any associated CVEs of some of them. Do I have to assume that they > > weren't all that important or that the process of reporting them was > > missing? Thanks > > > > https://github.com/guidovranken/cryptofuzz > > Fuzzing can easily find large numbers of bugs, and it's usually unclear > what the > security impact of them is. So if people want CVEs, someone has to > actually put > the effort into analyzing each bug and (if applicable) filing for a CVE. > Presumably just no one has done that for the above bugs. > > Something similar happened when I added fuzz tests to the Linux kernel's > crypto > API last year. In less than a year they had resulted in over 100 bug > fixes. > Most didn't *seem* too concerning, e.g. most were bugs in crypto drivers > that > seemed to be rarely used, or crypto algorithms that seemed to be rarely > used, or > edge cases in the crypto API that seemed to be rarely or never encountered. > > The bugs in userspace libraries found by cryptofuzz look somewhat > similar. They > include some of the same kinds of bugs, like mishandling zero-length > inputs, > mishandling data passed in specific chunk sizes, or bugs in weird > algorithms. > > However, in both cases it isn't possible to be certain of the impact and > applicability for a CVE of each bug without analyzing each bug in detail, > which > would be very time-consuming, and in general it's no one's job to do that. > > Likewise, syzkaller has found thousands of Linux kernel bugs and most > haven't > had CVEs filed. > > - Eric >
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