Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2016.2086
linux security update
5 September 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel
Publisher: Debian
Operating System: Debian GNU/Linux 8
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-6828 CVE-2016-6480 CVE-2016-6136
CVE-2016-5696
Reference: ESB-2016.2027
ESB-2016.1997
Original Bulletin:
http://www.debian.org/security/2016/dsa-3659
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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
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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/
Mailing list: debian-security-announce@lists.debian.org
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