Date: Wed, 8 Oct 2014 23:13:30 +0100 From: Vitor Ventura <ventura.vitor@...il.com> To: oss-security@...ts.openwall.com Subject: Re: openssh on linux rce in sftp-only mode Yes you do need to connect to it via ptrace, in order to read the mem. Em 08/10/2014 22:58, "Jann Horn" <jann@...jh.net> escreveu: > On Wed, Oct 08, 2014 at 03:32:23PM -0400, Josh Bressers wrote: > > > > > > I reported this to the OpenSSH developers, and although they included > my > > > patch as a mitigation, they did not treat it as a vuln in OpenSSH. > > > > > > I believe that treating this as a hardening patch makes sense. The SFTP > > > server behaves exactly as documented, it allows access to the whole > > > filesystem. And on Linux, that happens to equal write access to the > > > process RAM, so you should never give that access to someone who > > > shouldn't be able to run arbitrary code. > > > > > > > I think one has to assume if a user has unrestricted sftp access, they > can > > figure out how to do most anything. Even with the upstream hardening > patch, > > it really only protects the sftpd process. Any other processes the user > may > > own could be modified. > > Not that easily - /proc/$pid/mem requires you to either be the same process > or be attached to it via ptrace, I think. >
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