CVE-2016-5696

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Summary

CVECVE-2016-5696
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-08-06 20:59:05 UTC
Updated2026-05-06 22:30:45 UTC
Descriptionnet/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.

Risk And Classification

Primary CVSS: v3.0 4.8 MEDIUM from [email protected]

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Problem Types: CWE-200 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary4.8MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
2.0[email protected]Primary5.8AV:N/AC:M/Au:N/C:N/I:P/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:N/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Google Android All All All All
Operating System Linux Linux Kernel All All All All
Application Oracle Vm Server 3.3 All All All
Application Oracle Vm Server 3.4 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
USN-3070-1: Linux kernel vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Security Advisory 0023 - Arista af854a3a-2127-422b-91ae-364da2661108 www.arista.com
Android Security Bulletin—October 2016 | Android Open Source Project af854a3a-2127-422b-91ae-364da2661108 source.android.com Third Party Advisory
USN-3072-2: Linux kernel (OMAP4) vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
CVE-2016-5696 Kernel Vulnerability af854a3a-2127-422b-91ae-364da2661108 security.paloaltonetworks.com
Oracle VM Server for x86 Bulletin - July 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Vendor Advisory
USN-3070-2: Linux kernel (Raspberry Pi 2) vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
oss-security - Re: CVE-2016-5389: linux kernel - challange ack information leak. af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
GitHub - Gnoxter/mountain_goat: A PoC demonstrating techniques exploiting CVE-2016-5696 Off-Path TCP Exploits: Global Rate Limit Considered Dangerous af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
USN-3072-1: Linux kernel vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Mitnick Attack Reappears at GeekPwn Macau Contest af854a3a-2127-422b-91ae-364da2661108 www.prnewswire.com Technical Description
Bug 1354708 – CVE-2016-5696 kernel: challenge ACK counter information disclosure. af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Oracle Linux Bulletin - July 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
USN-3071-2: Linux kernel (Trusty HWE) vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
McAfee Security Bulletin: kernel challenge ACK counter information disclosure vulnerability (CVE-2016-5696) af854a3a-2127-422b-91ae-364da2661108 kc.mcafee.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Linux Kernel 'Ack Challenge' Information Disclosure Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Linux Kernel Lets Remote Users Obtain Potentially Sensitive Information About, Deny Service, and Hijack Target TCP Connections in Certain Cases - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
www.usenix.org/system/files/conference/usenixsecurity16/sec16_paper_cao.pdf af854a3a-2127-422b-91ae-364da2661108 www.usenix.org Technical Description
kernel/git/torvalds/linux.git - Linux kernel source tree af854a3a-2127-422b-91ae-364da2661108 git.kernel.org Issue Tracking, Patch
USN-3071-1: Linux kernel vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
USN-3070-3: Linux kernel (Qualcomm Snapdragon) vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
USN-3070-4: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
Broadcom Support Portal af854a3a-2127-422b-91ae-364da2661108 bto.bluecoat.com
tcp: make challenge acks less predictable · torvalds/linux@75ff39c · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Issue Tracking, Patch
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
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