CVE-2016-5696

Public Exploit

Description

net/ipv4/tcp_input.c in the Linux kernel before 4.7 does not properly determine the rate of challenge ACK segments, which makes it easier for remote attackers to hijack TCP sessions via a blind in-window attack.

Category

4.8
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 29.16% Top 5%
Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory oracle.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html vendor advisory
https://github.com/Gnoxter/mountain_goat third party advisory exploit
http://www.ubuntu.com/usn/USN-3070-1 vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1657.html vendor advisory
https://bto.bluecoat.com/security-advisory/sa131
https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758 issue tracking patch
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html third party advisory
http://rhn.redhat.com/errata/RHSA-2016-1814.html vendor advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10167
http://source.android.com/security/bulletin/2016-10-01.html third party advisory
http://www.securityfocus.com/bid/91704 vdb entry
http://www.ubuntu.com/usn/USN-3070-3 vendor advisory
http://www.ubuntu.com/usn/USN-3070-2 vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1815.html vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1939.html vendor advisory
http://www.ubuntu.com/usn/USN-3071-1 vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1632.html vendor advisory
https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf technical description
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758 issue tracking patch
http://www.ubuntu.com/usn/USN-3070-4 vendor advisory
http://www.securitytracker.com/id/1036625 vdb entry
http://rhn.redhat.com/errata/RHSA-2016-1631.html vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1354708 issue tracking
http://www.ubuntu.com/usn/USN-3072-2 vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1633.html vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1664.html vendor advisory
http://www.ubuntu.com/usn/USN-3072-1 vendor advisory
http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html technical description
http://www.openwall.com/lists/oss-security/2016/07/12/2 third party advisory mailing list
http://www.ubuntu.com/usn/USN-3071-2 vendor advisory
https://security.paloaltonetworks.com/CVE-2016-5696
https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23

Frequently Asked Questions

What is the severity of CVE-2016-5696?
CVE-2016-5696 has been scored as a medium severity vulnerability.
How to fix CVE-2016-5696?
To fix CVE-2016-5696, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-5696 being actively exploited in the wild?
It is possible that CVE-2016-5696 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~29% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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