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Date: Tue, 25 Apr 2017 16:56:56 -0400
From: Stuart Gathman <stuart@...hman.org>
To: oss-security@...ts.openwall.com
Subject: Re: SquirrelMail <= 1.4.23 Remote Code Execution
(CVE-2017-7692)
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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