oss-sec mailing list archives
Re: openssh on linux rce in sftp-only mode
From: Josh Bressers <bressers () redhat com>
Date: Wed, 8 Oct 2014 15:32:23 -0400 (EDT)
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. -- JB
Current thread:
- openssh on linux rce in sftp-only mode Hanno Böck (Oct 08)
- Re: openssh on linux rce in sftp-only mode Jann Horn (Oct 08)
- Re: openssh on linux rce in sftp-only mode Josh Bressers (Oct 08)
- Re: openssh on linux rce in sftp-only mode Jann Horn (Oct 08)
- Re: openssh on linux rce in sftp-only mode Josh Bressers (Oct 08)
- Re: openssh on linux rce in sftp-only mode Jann Horn (Oct 08)
- Re: openssh on linux rce in sftp-only mode Yves-Alexis Perez (Oct 09)
- Re: openssh on linux rce in sftp-only mode Josh Bressers (Oct 08)
- Re: openssh on linux rce in sftp-only mode Vitor Ventura (Oct 09)
- Re: openssh on linux rce in sftp-only mode Jann Horn (Oct 08)