[SECURITY] [DLA 1608-1] php5 security update

Package : php5
Version : 5.6.39+dfsg-0+deb8u1
CVE ID : CVE-2018-19518 CVE-2018-19935

Vulnerabilities have been discovered in php5, a server-side,
HTML-embedded scripting language. Note that this update includes a
change to the default behavior for IMAP connections. See below for
details.

CVE-2018-19518

An argument injection vulnerability in imap_open() may allow a
remote attacker to execute arbitrary OS commands on the IMAP server.

The fix for the CVE-2018-19518 vulnerability included this
additional note from the upstream developers:

Starting with 5.6.38, rsh/ssh logins are disabled by default. Use
imap.enable_insecure_rsh if you want to enable them. Note that the
IMAP library does not filter mailbox names before passing them to
rsh/ssh command, thus passing untrusted data to this function with
rsh/ssh enabled is insecure.

CVE-2018-19935

A NULL pointer dereference leads to an application crash and a
denial of service via an empty string in the message argument to the
imap_mail function of ext/imap/php_imap.c.

For Debian 8 "Jessie", these problems have been fixed in version
5.6.39+dfsg-0+deb8u1.

We recommend that you upgrade your php5 packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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