CVE-2017-7692

Publication date 20 April 2017

Last updated 24 July 2024


Ubuntu priority

Cvss 3 Severity Score

8.8 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
squirrelmail 17.04 zesty Not in release
16.10 yakkety
Fixed 2:1.4.23~svn20120406-2+deb8u1ubuntu0.16.10.1
16.04 LTS xenial
Fixed 2:1.4.23~svn20120406-2+deb8u1ubuntu0.16.04.1
14.04 LTS trusty
Fixed 2:1.4.23~svn20120406-2+deb8u1build0.14.04.1
12.04 LTS precise Ignored end of life

Notes


ratliff

Duplicate of CVE-2017-5181

Severity score breakdown

Parameter Value
Base score 8.8 · High
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