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Date: Wed, 8 Oct 2014 15:32:23 -0400 (EDT)
From: Josh Bressers <>
Subject: Re: openssh on linux rce in sftp-only mode

> 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.

I would hesitate to call this a security issue, if we do I think we open a
can of worms.


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