CVE-2018-19518

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CVE-2018-19518

Summary:

Details: University of Washington IMAP Toolkit 2007f on UNIX, as used in imap_open() in PHP and other products, launches an rsh command (by means of the imap_rimap function in c-client/imap4r1.c and the tcp_aopen function in osdep/unix/tcp_unix.c) without preventing argument injection, which might allow remote attackers to execute arbitrary OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics. For example, if rsh is a link to ssh (as seen on Debian and Ubuntu systems), then the attack can use an IMAP server name containing a "-oProxyCommand" argument.

References: http://www.securityfocus.com/bid/106018, http://www.securitytracker.com/id/1042157, https://git.php.net/?p=php-src.git%3Ba=commit%3Bh=e5bfea64c81ae34816479bb05d17cdffe45adddb, https://bugs.debian.org/913775, https://bugs.debian.org/913835, https://bugs.debian.org/913836, https://bugs.php.net/bug.php?id=77160, https://lists.debian.org/debian-lts-announce/2018/12/msg00006.html, https://lists.debian.org/debian-lts-announce/2019/03/msg00001.html, https://lists.debian.org/debian-lts-announce/2021/12/msg00031.html, https://security.gentoo.org/glsa/202003-57, https://security.netapp.com/advisory/ntap-20181221-0004/, https://usn.ubuntu.com/4160-1/, https://www.debian.org/security/2018/dsa-4353, https://antichat.com/threads/463395/#post-4254681, https://bugs.php.net/bug.php?id=76428, https://bugs.php.net/bug.php?id=77153, https://github.com/Bo0oM/PHP_imap_open_exploit/blob/master/exploit.php, https://www.exploit-db.com/exploits/45914/, https://www.openwall.com/lists/oss-security/2018/11/22/3