In lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a buffer over-read while parsing malformed TCP, UDP, and IPv6 packets in the functions `extract_l3_ipv6`, `extract_l4_tcp`, and `extract_l4_udp` that can be triggered remotely.

An update of the openvswitch package has been released.

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-3450-1 advisory.

    Bhargava Shastry discovered that Open vSwitch incorrectly handled certain OFP messages. A remote attacker     could possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service.
    (CVE-2017-9214)

    It was discovered that Open vSwitch incorrectly handled certain OpenFlow role messages. A remote attacker     could possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service.
    (CVE-2017-9263)

    It was discovered that Open vSwitch incorrectly handled certain malformed packets. A remote attacker could     possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service. This issue only     affected Ubuntu 17.04. (CVE-2017-9264)

    It was discovered that Open vSwitch incorrectly handled group mod OpenFlow messages. A remote attacker     could possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service.
    (CVE-2017-9265)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

An update for openvswitch is now available for Fast Datapath for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Open vSwitch provides standard network bridging functions and support for the OpenFlow protocol for remote per-flow control of traffic.

The following packages have been upgraded to a later upstream version:
openvswitch (2.7.2). (BZ#1472854)

Security Fix(es) :

* An unsigned int wrap around leading to a buffer over-read was found when parsing OFPT_QUEUE_GET_CONFIG_REPLY messages in Open vSwitch (OvS). An attacker could use this flaw to cause a remote DoS.
(CVE-2017-9214)

* In Open vSwitch (OvS), while parsing an OpenFlow role status message there is a call to the abort() function for undefined role status reasons in the function `ofp_print_role_status_message` in `lib/ofp-print.c` that may be leveraged toward a remote DoS attack by a malicious switch. (CVE-2017-9263)

* A buffer over-read was found in the Open vSwitch (OvS) firewall implementation. This flaw can be triggered by parsing a specially crafted TCP, UDP, or IPv6 packet. A remote attack could use this flaw to cause a Denial of Service (DoS). (CVE-2017-9264)

* A buffer over-read flaw was found in Open vSwitch (OvS) while parsing the group mod OpenFlow messages sent from the controller. An attacker could use this flaw to cause a Denial of Service (DoS).
(CVE-2017-9265)

Security fix for CVE-2017-9264

----

Security fix for CVE-2017-9214

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
121699	Photon OS 1.0: Openvswitch PHSA-2017-0020	Nessus	PhotonOS Local Security Checks	critical
103813	Ubuntu 16.04 LTS : Open vSwitch vulnerabilities (USN-3450-1)	Nessus	Ubuntu Local Security Checks	critical
102187	RHEL 7 : openvswitch (RHSA-2017:2418)	Nessus	Red Hat Local Security Checks	critical
101648	Fedora 26 : openvswitch (2017-671e8c760f)	Nessus	Fedora Local Security Checks	critical

Detections

Analytics

CVE-2017-9264

critical

Tenable Plugins

critical

critical

critical

critical