Python-Django and Isp-dhcp updates for Debian
Posted on: 03/08/2018 09:37 AM

The following updates has been released for Debian GNU/Linux:

Debian GNU/Linux 7 LTS:
DLA 1303-1: python-django security update

Debian GNU/Linux 8 and 9:
DSA 4133-1: isc-dhcp security update

DLA 1303-1: python-django security update



Package : python-django
Version : 1.4.22-1+deb7u4
CVE ID : CVE-2018-7536 CVE-2018-7537


Several functions were extremely slow to evaluate certain inputs due to
catastrophic backtracking vulnerabilities in several regular expressions.

CVE-2018-7536

The django.utils.html.urlize() function was extremely slow to evaluate
certain inputs due to catastrophic backtracking vulnerabilities in two
regular expressions. The urlize() function is used to implement the urlize
and urlizetrunc template filters, which were thus vulnerable.

The problematic regular expressions are replaced with parsing logic that
behaves similarly.

CVE-2018-7537

If django.utils.text.Truncators chars() and words() methods were passed
the html=True argument, they were extremely slow to evaluate certain inputs
due to a catastrophic backtracking vulnerability in a regular expression.
The chars() and words() methods are used to implement the truncatechars_html
and truncatewords_html template filters, which were thus vulnerable.

The backtracking problem in the regular expression is fixed.

For Debian 7 "Wheezy", these problems have been fixed in version
1.4.22-1+deb7u4.

We recommend that you upgrade your python-django 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



DSA 4133-1: isc-dhcp security update



- -------------------------------------------------------------------------
Debian Security Advisory DSA-4133-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
March 07, 2018 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : isc-dhcp
CVE ID : CVE-2017-3144 CVE-2018-5732 CVE-2018-5733
Debian Bug : 887413 891785 891786

Several vulnerabilities have been discovered in the ISC DHCP client,
relay and server. The Common Vulnerabilities and Exposures project
identifies the following issues:

CVE-2017-3144

It was discovered that the DHCP server does not properly clean up
closed OMAPI connections, which can lead to exhaustion of the pool
of socket descriptors available to the DHCP server, resulting in
denial of service.

CVE-2018-5732

Felix Wilhelm of the Google Security Team discovered that the DHCP
client is prone to an out-of-bound memory access vulnerability when
processing specially constructed DHCP options responses, resulting
in potential execution of arbitrary code by a malicious DHCP server.

CVE-2018-5733

Felix Wilhelm of the Google Security Team discovered that the DHCP
server does not properly handle reference counting when processing
client requests. A malicious client can take advantage of this flaw
to cause a denial of service (dhcpd crash) by sending large amounts
of traffic.

For the oldstable distribution (jessie), these problems have been fixed
in version 4.3.1-6+deb8u3.

For the stable distribution (stretch), these problems have been fixed in
version 4.3.5-3+deb9u1.

We recommend that you upgrade your isc-dhcp packages.

For the detailed security status of isc-dhcp please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/isc-dhcp

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







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