Date: Thu, 30 Jul 2015 11:58:57 -0400 From: Scott Arciszewski <scott@...agonie.com> To: oss-security@...ts.openwall.com Cc: Assign a CVE Identifier <cve-assign@...re.org> Subject: Re: A new class of security vulns? On Thu, Jul 30, 2015 at 11:33 AM, Kurt Seifried <kseifried@...hat.com> wrote: > So in past we have had vulns around injection of terminal control > characters into log files: > > http://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=terminal+escape > > However now I'm seeing flaws around printing/display of user data, e.g. > systems where a user can set their own name, but fills it with backspace > characters, so when an admin looks at the text record it is > mangled/shows something the attacker wants them to see and not the > "True" data. > > An example of this is: > > https://fedorahosted.org/freeipa/ticket/5153 > > assuming there are no actual terminal escape sequences allowed, but just > backspace characters/etc, is this worthy of a CVE? Right now it > definitely allows manipulation of displayed data, and if an admin cuts > and pastes it would potentially be just the modified data, so I'm > thinking there is an integrity impact (not a very big one mind you), but > it's quite limited (at least as I understand the issue right now). > > -- > Kurt Seifried -- Red Hat -- Product Security -- Cloud > PGP A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993 > Red Hat Product Security contact: secalert@...hat.com How would you exploit it? By adding a special command to someone's terminal inputs (i.e. a backdoored version of fixubuntu.org that adds a public key to /root/.ssh/authorized_keys) and then hiding it afterwards? It's worth exploring, but I'm not sold on the practicality. Scott Arciszewski Chief Development Officer Paragon Initiative Enterprises <https://paragonie.com>
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