Date: Mon, 20 Dec 2010 13:59:46 -0500 (EST) From: Petr Matousek <pmatouse@...hat.com> To: "Steven M. Christey" <coley@...us.mitre.org> Cc: oss-security@...ts.openwall.com, Dan Rosenberg <dan.j.rosenberg@...il.com> Subject: Re: CVE request: kernel: CAN information leak, 2nd attempt ----- Original Message ----- > I'm ok with this, but I wanted to point out that the previously > mentioned heap overflow is a semantic overflow only. Because the > field that is being overflowed is the last field in a struct that is > always allocated in a chunk significantly larger than the struct > itself, the overflow will never result in any kind of corruption, so > it has essentially no security impact. Yes, we are aware of this . Personally I'd call it a mitigation factor even though I don't have a strong opinion here. Steve, could you please comment?  https://bugzilla.redhat.com/show_bug.cgi?id=649695#c7 Petr > > -Dan > > On Mon, Dec 20, 2010 at 1:36 PM, Petr Matousek <pmatouse@...hat.com> > wrote: > > "The CAN protocol uses the address of a kernel heap object as a proc > > filename, revealing information that could be useful during > > exploitation." > > > > Reference: > > https://bugzilla.redhat.com/show_bug.cgi?id=664544 > > http://seclists.org/oss-sec/2010/q4/103 > > > > Credit: Dan Rosenberg > > > > ------------ > > > > Please note that there has been one attempt to request CVE for this > > issue already . The problem is that vendors (Red Hat more or less > > included) used the assigned CVE for the potential heap overflow > > issue > > [2, 3] whereas reporter used it for information leak . > > > >  http://seclists.org/oss-sec/2010/q4/107 > >  > > http://lists.opensuse.org/opensuse-updates/2010-12/msg00026.html > >  http://www.debian.org/security/2010/dsa-2126 > >  http://www.cs.brown.edu/people/drosenbe/research.html > > > > I'd suggest to keep the CVE-2010-3874 id for the heap overflow which > > has some (although very limited) security potential and assign a new > > id > > for the information leak. > > > > Thanks, > > -- > > Petr Matousek / Red Hat Security Response Team > > > >
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