ESB-2018.3890 - [Debian] php5: Multiple vulnerabilities 2018-12-17

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3890
                     [DLA 1608-1] php5 security update
                             17 December 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           php5
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account            
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-19935 CVE-2018-19518 

Reference:         ESB-2018.3830
                   ESB-2018.3801

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2018/12/msg00006.html

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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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