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AUSCERT External Security Bulletin Redistribution
[DLA 1608-1] php5 security update
17 December 2018
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote with User Interaction
CVE Names: CVE-2018-19935 CVE-2018-19518
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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
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.
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
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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