Date: Wed, 26 Apr 2017 04:30:16 -0300 From: Dawid Golunski <dawid@...alhackers.com> To: oss-security@...ts.openwall.com Subject: Re: SquirrelMail <= 1.4.23 Remote Code Execution (CVE-2017-7692) Stuart, Your suggested mitigation is good and was in fact already mentioned in my advisory, see 'VIII. SOLUTION' section of: https://legalhackers.com/advisories/SquirrelMail-Exploit-Remote-Code-Exec-CVE-2017-7692-Vuln.html As for the utility I just wrote my own C tool that loops through argv and saves it into a file. If you need something more advanced / already available you can try auditd rules. Regards, Dawid Golunski https://legalhackers.com | https://ExploitBox.io t: @dawid_golunski On Tue, Apr 25, 2017 at 5:56 PM, Stuart Gathman <stuart@...hman.org> wrote: > On 04/24/2017 05:14 PM, Dawid Golunski wrote: >> SquirrelMail <= 1.4.23 Remote Code Execution (CVE-2017-7692) >> >> Desc.: >> SquirrelMail is affected by a critical Remote Code Execution vulnerability >> which stems from insufficient escaping of user-supplied data when >> SquirrelMail has been configured with Sendmail as the main transport. >> An authenticated attacker may be able to exploit the vulnerability >> to execute arbitrary commands on the target and compromise the remote >> system. > We deploy squirrelmail NOT using sendmail for sending mail ($useSendmail > = false). There is no reason not to use SMTP instead of running > sendmail directly. It doesn't seem to be vulnerable that way - and I > suggest that as a mitigation. Just to be sure, after reading this > advisory I added $sendmail_path = '/usr/sbin/false'; (We always avoid > direct command execution with PHP because PHP is prone to quoting bugs.) > > OT: is there already a utility that *safely* logs arguments and stdin > (as was apparently used to explain the exploit)? I could write a C > prog, or a carefully quoted bash script - but would rather use an > already proven utility. >
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