Vulnerability Details : CVE-2016-5696
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.
Vulnerability category: Information leak
Products affected by CVE-2016-5696
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:vm_server:3.4:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:vm_server:3.3:*:*:*:*:*:*:*
- cpe:2.3:o:google:android:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2016-5696
0.45%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2016-5696
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:P |
8.6
|
4.9
|
NIST | |
|
4.8
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
2.2
|
2.5
|
NIST |
CWE ids for CVE-2016-5696
-
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.Assigned by: nvd@nist.gov (Primary)
References for CVE-2016-5696
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http://rhn.redhat.com/errata/RHSA-2016-1633.html
RHSA-2016:1633 - Security Advisory - Red Hat Customer Portal
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http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=75ff39ccc1bd5d3c455b6822ab09e533c551f758
kernel/git/torvalds/linux.git - Linux kernel source treeIssue Tracking;Patch
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http://www.openwall.com/lists/oss-security/2016/07/12/2
oss-security - Re: CVE-2016-5389: linux kernel - challange ack information leak.Mailing List;Third Party Advisory
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http://www.ubuntu.com/usn/USN-3072-1
USN-3072-1: Linux kernel vulnerabilities | Ubuntu security notices
-
http://www.ubuntu.com/usn/USN-3071-1
USN-3071-1: Linux kernel vulnerabilities | Ubuntu security notices
-
http://www.ubuntu.com/usn/USN-3072-2
USN-3072-2: Linux kernel (OMAP4) vulnerabilities | Ubuntu security notices
-
https://bugzilla.redhat.com/show_bug.cgi?id=1354708
1354708 – (CVE-2016-5696) CVE-2016-5696 kernel: challenge ACK counter information disclosure.Issue Tracking
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http://www.securityfocus.com/bid/91704
Linux Kernel 'Ack Challenge' Information Disclosure Vulnerability
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https://bto.bluecoat.com/security-advisory/sa131
SA131 : TCP Session Hijacking in Operating Systems Supporting RFC 5961
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http://www.ubuntu.com/usn/USN-3070-1
USN-3070-1: Linux kernel vulnerabilities | Ubuntu security notices
-
http://rhn.redhat.com/errata/RHSA-2016-1631.html
RHSA-2016:1631 - Security Advisory - Red Hat Customer Portal
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https://security.paloaltonetworks.com/CVE-2016-5696
CVE-2016-5696 Kernel Vulnerability
-
https://github.com/Gnoxter/mountain_goat
GitHub - Gnoxter/mountain_goat: A PoC demonstrating techniques exploiting CVE-2016-5696 Off-Path TCP Exploits: Global Rate Limit Considered DangerousExploit;Third Party Advisory
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http://www.ubuntu.com/usn/USN-3070-4
USN-3070-4: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices
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https://www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf
Technical Description
-
http://www.ubuntu.com/usn/USN-3071-2
USN-3071-2: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu security notices
-
http://www.ubuntu.com/usn/USN-3070-2
USN-3070-2: Linux kernel (Raspberry Pi 2) vulnerabilities | Ubuntu security notices
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http://rhn.redhat.com/errata/RHSA-2016-1632.html
RHSA-2016:1632 - Security Advisory - Red Hat Customer Portal
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https://www.arista.com/en/support/advisories-notices/security-advisories/1461-security-advisory-23
Security Advisory 0023 - Arista
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http://www.securitytracker.com/id/1036625
Linux Kernel Lets Remote Users Obtain Potentially Sensitive Information About, Deny Service, and Hijack Target TCP Connections in Certain Cases - SecurityTracker
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http://www.ubuntu.com/usn/USN-3070-3
USN-3070-3: Linux kernel (Qualcomm Snapdragon) vulnerabilities | Ubuntu security notices
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https://github.com/torvalds/linux/commit/75ff39ccc1bd5d3c455b6822ab09e533c551f758
tcp: make challenge acks less predictable · torvalds/linux@75ff39c · GitHubIssue Tracking;Patch
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https://kc.mcafee.com/corporate/index?page=content&id=SB10167
McAfee Security Bulletin: kernel challenge ACK counter information disclosure vulnerability (CVE-2016-5696)
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http://source.android.com/security/bulletin/2016-10-01.html
Android Security Bulletin—October 2016 | Android Open Source ProjectThird Party Advisory
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http://rhn.redhat.com/errata/RHSA-2016-1664.html
RHSA-2016:1664 - Security Advisory - Red Hat Customer Portal
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http://rhn.redhat.com/errata/RHSA-2016-1814.html
RHSA-2016:1814 - Security Advisory - Red Hat Customer Portal
-
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
Oracle VM Server for x86 Bulletin - July 2016Vendor Advisory
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http://rhn.redhat.com/errata/RHSA-2016-1815.html
RHSA-2016:1815 - Security Advisory - Red Hat Customer Portal
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http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
Oracle Linux Bulletin - July 2016Third Party Advisory
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http://www.prnewswire.com/news-releases/mitnick-attack-reappears-at-geekpwn-macau-contest-300270779.html
Mitnick Attack Reappears at GeekPwn Macau ContestTechnical Description
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http://rhn.redhat.com/errata/RHSA-2016-1939.html
RHSA-2016:1939 - Security Advisory - Red Hat Customer Portal
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http://rhn.redhat.com/errata/RHSA-2016-1657.html
RHSA-2016:1657 - Security Advisory - Red Hat Customer Portal
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