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CVE-2017-7692

Published: 20 April 2017

SquirrelMail 1.4.22 (and other versions before 20170427_0200-SVN) allows post-authentication remote code execution via a sendmail.cf file that is mishandled in a popen call. It's possible to exploit this vulnerability to execute arbitrary shell commands on the remote server. The problem is in the Deliver_SendMail.class.php with the initStream function that uses escapeshellcmd() to sanitize the sendmail command before executing it. The use of escapeshellcmd() is not correct in this case since it doesn't escape whitespaces, allowing the injection of arbitrary command parameters. The problem is in -f$envelopefrom within the sendmail command line. Hence, if the target server uses sendmail and SquirrelMail is configured to use it as a command-line program, it's possible to trick sendmail into using an attacker-provided configuration file that triggers the execution of an arbitrary command. For exploitation, the attacker must upload a sendmail.cf file as an email attachment, and inject the sendmail.cf filename with the -C option within the "Options > Personal Informations > Email Address" setting.

Notes

AuthorNote
ratliff
Duplicate of CVE-2017-5181

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
squirrelmail
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
upstream Needs triage

xenial
Released (2:1.4.23~svn20120406-2+deb8u1ubuntu0.16.04.1)
yakkety
Released (2:1.4.23~svn20120406-2+deb8u1ubuntu0.16.10.1)
zesty Does not exist

trusty
Released (2:1.4.23~svn20120406-2+deb8u1build0.14.04.1)

Severity score breakdown

Parameter Value
Base score 8.8
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H