An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6. The decode_bundle function inside lib/ofp-actions.c is affected by a buffer over-read issue during BUNDLE action decoding.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0053 advisory.

  - openvswitch: Mishandle of group mods in lib/ofp-util.c:parse_group_prop_ntr_selection_method() allows for     assertion failure (CVE-2018-17204)

  - openvswitch: Error during bundle commit in ofproto/ofproto.c:ofproto_rule_insert__() allows for crash     (CVE-2018-17205)

  - openvswitch: Buffer over-read in lib/ofp-actions.c:decode_bundle() (CVE-2018-17206)

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0081 advisory.

  - openvswitch: Mishandle of group mods in lib/ofp-util.c:parse_group_prop_ntr_selection_method() allows for     assertion failure (CVE-2018-17204)

  - openvswitch: Error during bundle commit in ofproto/ofproto.c:ofproto_rule_insert__() allows for crash     (CVE-2018-17205)

  - openvswitch: Buffer over-read in lib/ofp-actions.c:decode_bundle() (CVE-2018-17206)

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

Several issues have been found in openvswitch, a production quality, multilayer, software-based, Ethernet virtual switch.

CVE-2020-35498

Denial of service attacks, in which crafted network packets could cause the packet lookup to ignore network header fields from layers 3 and 4. The crafted network packet is an ordinary IPv4 or IPv6 packet with Ethernet padding length above 255 bytes. This causes the packet sanity check to abort parsing header fields after layer 2.

CVE-2020-27827

Denial of service attacks using crafted LLDP packets.

CVE-2018-17206

Buffer over-read issue during BUNDLE action decoding.

CVE-2018-17204

Assertion failure due to not validating information (group type and command) in OF1.5 decoder.

CVE-2017-9214

Buffer over-read that is caused by an unsigned integer underflow.

CVE-2015-8011

Buffer overflow in the lldp_decode function in daemon/protocols/lldp.c in lldpd before 0.8.0 allows remote attackers to cause a denial of service (daemon crash) and possibly execute arbitrary code via vectors involving large management addresses and TLV boundaries.

For Debian 9 stretch, these problems have been fixed in version 2.6.10-0+deb9u1. This version is a new upstream point release.

We recommend that you upgrade your openvswitch packages.

For the detailed security status of openvswitch please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/openvswitch

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An update of the openvswitch package has been released.

It was discovered that Open vSwitch incorrectly decoded certain packets. A remote attacker could possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service. (CVE-2018-17204)

It was discovered that Open vSwitch incorrectly handled processing certain flows. 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 18.04 LTS. (CVE-2018-17205)

It was discovered that Open vSwitch incorrectly handled BUNDLE action decoding. A remote attacker could possibly use this issue to cause Open vSwitch to crash, resulting in a denial of service.
(CVE-2018-17206).

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

This update for openvswitch to version 2.7.6 fixes the following issues :

These security issues were fixed :

CVE-2018-17205: Prevent OVS crash when reverting old flows in bundle commit (bsc#1104467).

CVE-2018-17206: Avoid buffer overread in BUNDLE action decoding (bsc#1104467).

CVE-2018-17204: When decoding a group mod, it validated the group type and command after the whole group mod has been decoded. The OF1.5 decoder, however, tried to use the type and command earlier, when it might still be invalid. This caused an assertion failure (via OVS_NOT_REACHED) (bsc#1104467).

The update package also includes non-security fixes. See advisory for details.

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

This update for openvswitch to version 2.7.6 fixes the following issues :

These security issues were fixed :

  - CVE-2018-17205: Prevent OVS crash when reverting old     flows in bundle commit (bsc#1104467).

  - CVE-2018-17206: Avoid buffer overread in BUNDLE action     decoding (bsc#1104467).

  - CVE-2018-17204:When decoding a group mod, it validated     the group type and command after the whole group mod has     been decoded. The OF1.5 decoder, however, tried to use     the type and command earlier, when it might still be     invalid. This caused an assertion failure (via     OVS_NOT_REACHED) (bsc#1104467).

These non-security issues were fixed :

  - ofproto/bond: Fix bond reconfiguration race condition.

  - ofproto/bond: Fix bond post recirc rule leak.

  - ofproto/bond: fix interal flow leak of tcp-balance bond

  - systemd: Restart openvswitch service if a daemon crashes

  - conntrack: Fix checks for TCP, UDP, and IPv6 header     sizes.

  - ofp-actions: Fix translation of set_field for nw_ecn

  - netdev-dpdk: Fix mempool segfault.

  - ofproto-dpif-upcall: Fix flow setup/delete race.

  - learn: Fix memory leak in learn_parse_sepc()

  - netdev-dpdk: fix mempool_configure error state

  - vswitchd: Add --cleanup option to the 'appctl exit'     command

  - ofp-parse: Fix memory leak on error path in     parse_ofp_group_mod_file().

  - actions: Fix memory leak on error path in     parse_ct_lb_action().

  - dpif-netdev: Fix use-after-free error in     reconfigure_datapath().

  - bridge: Fix memory leak in bridge_aa_update_trunks().

  - dpif-netlink: Fix multiple-free and fd leak on error     path.

  - ofp-print: Avoid array overread in     print_table_instruction_features().

  - flow: Fix buffer overread in flow_hash_symmetric_l3l4().

  - systemd: start vswitchd after udev

  - ofp-util: Check length of buckets in     ofputil_pull_ofp15_group_mod().

  - ovsdb-types: Fix memory leak on error path.

  - tnl-ports: Fix loss of tunneling upon removal of a     single tunnel port.

  - netdev: check for NULL fields in netdev_get_addrs

  - netdev-dpdk: vhost get stats fix.

  - netdev-dpdk: use 64-bit arithmetic when converting     rates.

  - ofp-util: Fix buffer overread in     ofputil_decode_bundle_add().

  - ofp-util: Fix memory leaks on error cases in     ofputil_decode_group_mod().

  - ofp-util: Fix memory leaks when parsing OF1.5 group     properties.

  - ofp-actions: Fix buffer overread in     decode_LEARN_specs().

  - flow: Fix buffer overread for crafted IPv6 packets.

  - ofp-actions: Properly interpret 'output:in_port'.

  - ovs-ofctl: Avoid read overrun in ofperr_decode_msg().

  - odp-util: Avoid misaligned references to ip6_hdr.

  - ofproto-dpif-upcall: Fix action attr iteration.

  - ofproto-dpif-upcall: Fix key attr iteration.

  - netdev-dpdk: vhost get stats fix.

  - netdev-dpdk: use 64-bit arithmetic when converting     rates.

  - ofp-util: Fix buffer overread in     ofputil_decode_bundle_add().

  - ofp-util: Fix memory leaks on error cases in     ofputil_decode_group_mod().

  - ofp-util: Fix memory leaks when parsing OF1.5 group     properties.

  - odp-util: Fix buffer overread in parsing string form of     ODP flows.

  - ovs-vsctl: Fix segfault when attempting to del-port from     parent bridge.

This update was imported from the SUSE:SLE-12-SP3:Update update project.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2018:3500 advisory.

  - openvswitch: Mishandle of group mods in lib/ofp-util.c:parse_group_prop_ntr_selection_method() allows for     assertion failure (CVE-2018-17204)

  - openvswitch: Error during bundle commit in ofproto/ofproto.c:ofproto_rule_insert__() allows for crash     (CVE-2018-17205)

  - openvswitch: Buffer over-read in lib/ofp-actions.c:decode_bundle() (CVE-2018-17206)

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

ID	Name	Product	Family	Severity
194036	RHEL 7 : openvswitch (RHSA-2019:0053)	Nessus	Red Hat Local Security Checks	high
194031	RHEL 7 : openvswitch (RHSA-2019:0081)	Nessus	Red Hat Local Security Checks	high
146677	Debian DLA-2571-1 : openvswitch security update	Nessus	Debian Local Security Checks	critical
135491	Photon OS 1.0: Openvswitch PHSA-2020-1.0-0288	Nessus	PhotonOS Local Security Checks	medium
121506	Ubuntu 16.04 LTS / 18.04 LTS : Open vSwitch vulnerabilities (USN-3873-1)	Nessus	Ubuntu Local Security Checks	high
119720	SUSE SLES12 Security Update : openvswitch (SUSE-SU-2018:4128-1)	Nessus	SuSE Local Security Checks	high
119716	openSUSE Security Update : openvswitch (openSUSE-2018-1562)	Nessus	SuSE Local Security Checks	high
118745	RHEL 7 : openvswitch (RHSA-2018:3500)	Nessus	Red Hat Local Security Checks	high

Detections

Analytics

CVE-2018-17206

medium

Tenable Plugins

high

high

critical

medium

high

high

high

high