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CVE-2017-7692

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 201709-13
Posted Sep 18, 2017
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201709-13 - A vulnerability in SquirrelMail might allow remote attackers to execute arbitrary code. Versions less than 1.4.23_pre20140426 are affected.

tags | advisory, remote, arbitrary
systems | linux, gentoo
advisories | CVE-2017-7692
MD5 | cb232401734b30b4a34acc080d281ec5
SquirrelMail 1.4.22 Remote Code Execution
Posted Apr 23, 2017
Authored by Dawid Golunski

SquirrelMail versions 1.4.22 and below suffer from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2017-7692
MD5 | aca9c60af6e94fd27e23b8ce1f25f382
Squirrelmail 1.4.22 Remote Code Execution
Posted Apr 19, 2017
Authored by Filippo Cavallarin

Squirrelmail versions 1.4.22 and below suffer from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2017-7692
MD5 | 800720d25684ef211bcc844e0901eb71
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