The following updates has been released for Debian:

[DLA 610-1] tiff3 security update
[DSA 3653-2] flex security update
[DSA 3659-1] linux security update

[DLA 610-1] tiff3 security update

Package : tiff3
Version : 3.9.6-11+deb7u1
CVE ID : CVE-2010-2596 CVE-2013-1961 CVE-2014-8128
CVE-2014-8129 CVE-2014-9655 CVE-2015-1547
CVE-2015-8665 CVE-2015-8683 CVE-2016-3186
CVE-2016-3623 CVE-2016-3945 CVE-2016-3990
CVE-2016-3991 CVE-2016-5314 CVE-2016-5315
CVE-2016-5316 CVE-2016-5317 CVE-2016-5320
CVE-2016-5321 CVE-2016-5322 CVE-2016-5323
CVE-2016-5875 CVE-2016-6223


Several security vulnerabilities were discovered in tiff3, a library
providing support for the Tag Image File Format (TIFF). An attacker
could take advantage of these flaws to cause a denial-of-service
against an application using the libtiff4 or libtiffxx0c2 library
(application crash), or potentially execute arbitrary code with the
privileges of the user running the application.

For Debian 7 "Wheezy", these problems have been fixed in version
3.9.6-11+deb7u1.

We recommend that you upgrade your tiff3 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 3653-2] flex security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3653-2 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 04, 2016 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : flex
CVE ID : CVE-2016-6354
Debian Bug : 832768 835542

It was reported that the update for flex as released in DSA-3653-1 did
not completely address CVE-2016-6354 as intended due to problems in the
patch handling and regenerated files during the build. Additionally a
regression was introduced, causing new warnings when compiling flex
generated code. Updated packages are now available to address these
problems. For reference, the relevant part of the original advisory
text follows.

Alexander Sulfrian discovered a buffer overflow in the
yy_get_next_buffer() function generated by Flex, which may result in
denial of service and potentially the execution of code if operating on
data from untrusted sources.

Affected applications need to be rebuild.

For the stable distribution (jessie), this problem has been fixed in
version 2.5.39-8+deb8u2.

We recommend that you upgrade your flex packages.

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/

[DSA 3659-1] linux security update

- -------------------------------------------------------------------------
Debian Security Advisory DSA-3659-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 04, 2016 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : linux
CVE ID : CVE-2016-5696 CVE-2016-6136 CVE-2016-6480 CVE-2016-6828

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or have other
impacts.

CVE-2016-5696

Yue Cao, Zhiyun Qian, Zhongjie Wang, Tuan Dao, and Srikanth V.
Krishnamurthy of the University of California, Riverside; and Lisa
M. Marvel of the United States Army Research Laboratory discovered
that Linux's implementation of the TCP Challenge ACK feature
results in a side channel that can be used to find TCP connections
between specific IP addresses, and to inject messages into those
connections.

Where a service is made available through TCP, this may allow
remote attackers to impersonate another connected user to the
server or to impersonate the server to another connected user. In
case the service uses a protocol with message authentication
(e.g. TLS or SSH), this vulnerability only allows denial of
service (connection failure). An attack takes tens of seconds, so
short-lived TCP connections are also unlikely to be vulnerable.

This may be mitigated by increasing the rate limit for TCP
Challenge ACKs so that it is never exceeded:
sysctl net.ipv4.tcp_challenge_ack_limit=1000000000

CVE-2016-6136

Pengfei Wang discovered that the audit subsystem has a
'double-fetch' or 'TOCTTOU' bug in its handling of special
characters in the name of an executable. Where audit logging of
execve() is enabled, this allows a local user to generate
misleading log messages.

CVE-2016-6480

Pengfei Wang discovered that the aacraid driver for Adaptec RAID
controllers has a 'double-fetch' or 'TOCTTOU' bug in its
validation of 'FIB' messages passed through the ioctl() system
call. This has no practical security impact in current Debian
releases.

CVE-2016-6828

Marco Grassi reported a 'use-after-free' bug in the TCP
implementation, which can be triggered by local users. The
security impact is unclear, but might include denial of service or
privilege escalation.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.36-1+deb8u1. In addition, this update contains several
changes originally targeted for the upcoming jessie point release.

We recommend that you upgrade your linux packages.

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/