CVE-2017-7692
Description
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| squirrelmail | squirrelmail | 1.4.22 | |
References
- http://openwall.com/lists/oss-security/2017/04/19/6
- http://openwall.com/lists/oss-security/2017/04/27/1
- http://www.debian.org/security/2017/dsa-3852
- http://www.securityfocus.com/bid/98067
- http://www.securitytracker.com/id/1038312
- https://legalhackers.com/advisories/SquirrelMail-Exploit-Remote-Code-Exec-CVE-2017-7692-Vuln.html
- https://security.gentoo.org/glsa/201709-13
- https://www.exploit-db.com/exploits/41910/
- http://openwall.com/lists/oss-security/2017/04/19/6
- http://openwall.com/lists/oss-security/2017/04/27/1
- http://www.debian.org/security/2017/dsa-3852
- http://www.securityfocus.com/bid/98067
- http://www.securitytracker.com/id/1038312
- https://legalhackers.com/advisories/SquirrelMail-Exploit-Remote-Code-Exec-CVE-2017-7692-Vuln.html
- https://security.gentoo.org/glsa/201709-13
- https://www.exploit-db.com/exploits/41910/
CWEs
CWE-20
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.