CVE-2018-19518: High severity PHP PHP vulnerability

Published Nov 25, 2018
·
Updated

Fixed bug (imapopen allows to run arbitrary shell commands via mailbox parameter). (CVE-2018-19518)

Other sources

University of Washington IMAP Toolkit 2007f on UNIX, as used in imapopen() in PHP and other products, launches an rsh command (by means of the imaprimap function in c-client/imap4r1.c and the tcpaopen function in osdep/unix/tcpunix.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OS commands if the IMAP server name is untrusted input (e.g., entered by a user of a web application) and if rsh has been replaced by a program with different argument semantics.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.

— Launchpad

Affected Software

13 affected componentsFixes available
PHP PHP<7.0.33
7.0.33
PHP PHP>=5.6.0<=5.6.38
PHP PHP>=7.0.0<=7.0.32
PHP PHP>=7.1.0<=7.1.24
PHP PHP>=7.2.0<=7.2.12
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Uw-imap Project Uw-imap=2007f
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
Canonical Ubuntu Linux=19.04
debian/uw-imap
8:2007f~dfsg-7
alpine/php7<7.1.29-r0
7.1.29-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade PHP to a version that resolves this vulnerability.

    Fixed in 7.0.33
  2. Upgrade

    Upgrade debian/uw-imap to a version that resolves this vulnerability.

    Fixed in 8:2007f~dfsg-7
  3. Upgrade

    Upgrade alpine/php7 to a version that resolves this vulnerability.

    Fixed in 7.1.29-r0

Event History

Nov 25, 2018
CVE Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
RemedyDescriptionSeverityAffected Software
CVE Published
via MITRE·10:00 AM
Data Sourced
via MITRE·10:00 AM
Description
Data Sourced
via NVD·10:29 AM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·10:29 AM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2018-19518?

CVE-2018-19518 has a high severity rating due to its ability to execute arbitrary shell commands.

2

How do I fix CVE-2018-19518?

To fix CVE-2018-19518, upgrade to the appropriate remedied versions of affected packages including PHP and UW-IMAP.

3

Which versions are affected by CVE-2018-19518?

Affected versions include various PHP versions before 5.6.39, 7.0.x before 7.0.33, and several other specified UW-IMAP versions.

4

What products are impacted by CVE-2018-19518?

CVE-2018-19518 impacts products such as PHP and UW-IMAP when using the imap_open function.

5

Is CVE-2018-19518 a remote code execution vulnerability?

Yes, CVE-2018-19518 allows remote attackers to execute arbitrary shell commands, constituting a remote code execution vulnerability.

Company

Resources

Contact

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