CVE-2017-7692
57Vexday Risk Score
Prioritize patching. It exploitation observed by VulnCheck and has a public proof of concept.
ssvc Actepss 32%
from disclosure to weapon3 days
Published on NVDApr 20
1st PoC+3d
VulnCheck+3317d
exploitation probability
32%top 2% of all CVEs
observed exploitation
yesVulnCheck
2 public exploit(s)
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.
Affected products
n/a · n/apublic PoCs found — 2
cve_referencewww.exploit-db.com/exploits/41910/unverifiedexploitdbwww.exploit-db.com/exploits/41910unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
http://openwall.com/lists/oss-security/2017/04/19/6http://openwall.com/lists/oss-security/2017/04/27/1https://legalhackers.com/advisories/SquirrelMail-Exploit-Remote-Code-Exec-CVE-2017-7692-Vuln.htmlhttps://security.gentoo.org/glsa/201709-13https://www.exploit-db.com/exploits/41910/http://www.debian.org/security/2017/dsa-3852http://www.securityfocus.com/bid/98067http://www.securitytracker.com/id/1038312