CVE-2018-19518

high-risk

Published 2018-11-25

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OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics.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

Do I need to act?

93.9% chance of exploitation in next 30 days

EPSS score — higher than 6% of all CVEs

Not on CISA KEV list

No confirmed active exploitation reported to CISA

1 public exploit available

45914

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 7.5/10 High

NETWORK / HIGH complexity

Affected Products (7)

Php

Debian Linux

Uw-Imap

Ubuntu Linux

Affected Vendors

Debian Php Canonical Uw-Imap Project

References (40)

Broken Link http://www.securityfocus.com/bid/106018

Broken Link http://www.securitytracker.com/id/1042157

Exploit https://antichat.com/threads/463395/#post-4254681

Mailing List https://bugs.debian.org/913775

Mailing List https://bugs.debian.org/913835

Mailing List https://bugs.debian.org/913836

Exploit https://bugs.php.net/bug.php?id=76428

Exploit https://bugs.php.net/bug.php?id=77153

Vendor Advisory https://bugs.php.net/bug.php?id=77160

https://git.php.net/?p=php-src.git%3Ba=commit%3Bh=e5bfea64c81ae34816479bb05d17cd...

Exploit https://github.com/Bo0oM/PHP_imap_open_exploit/blob/master/exploit.php

Mailing List https://lists.debian.org/debian-lts-announce/2018/12/msg00006.html

Mailing List https://lists.debian.org/debian-lts-announce/2019/03/msg00001.html

Mailing List https://lists.debian.org/debian-lts-announce/2021/12/msg00031.html

Third Party Advisory https://security.gentoo.org/glsa/202003-57

Third Party Advisory https://security.netapp.com/advisory/ntap-20181221-0004/

Third Party Advisory https://usn.ubuntu.com/4160-1/

Third Party Advisory https://www.debian.org/security/2018/dsa-4353

Exploit https://www.exploit-db.com/exploits/45914/

Exploit https://www.openwall.com/lists/oss-security/2018/11/22/3

and 20 more references

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high-risk

Severity 22/34 · High

Exploitability 27/34 · High

Exposure 14/34 · Moderate