Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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.
>

Powered by blists - more mailing lists

Your e-mail address:

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.