CVE-2018-19518 Information

Description

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OS commands if the IMAP server name is untrusted input (e.g. entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics.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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

http://www.securityfocus.com/bid/106018 http://www.securitytracker.com/id/1042157 https://antichat.com/threads/463395/post-4254681 https://bugs.debian.org/913775 https://bugs.debian.org/913835 https://bugs.debian.org/913836 https://bugs.php.net/bug.php?id=76428 https://bugs.php.net/bug.php?id=77153 https://bugs.php.net/bug.php?id=77160 https://git.php.net/?p=php-src.git;a=commit;h=e5bfea64c81ae34816479bb05d17cdffe45adddb https://github.com/Bo0oM/PHP_imap_open_exploit/blob/master/exploit.php https://lists.debian.org/debian-lts-announce/2018/12/msg00006.html https://lists.debian.org/debian-lts-announce/2019/03/msg00001.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://www.exploit-db.com/exploits/45914/ https://www.openwall.com/lists/oss-security/2018/11/22/3

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.5