PT-2018-2465 · Open Vswitch+3 · Openvswitch+3

Published 2018-08-15 · Updated 2021-08-04 · CVE-2018-17204

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Open vSwitch (OvS) versions 2.7.x through 2.7.6

Description An issue was discovered in Open vSwitch (OvS), affecting the parse group prop ntr selection method function in lib/ofp-util.c. When decoding a group mod, it validates the group type and command after the whole group mod has been decoded. However, the OF1.5 decoder tries to use the type and command earlier, when it might still be invalid, causing an assertion failure via OVS NOT REACHED. This issue can be exploited by a remote attacker to cause a denial of service.

Recommendations For Open vSwitch (OvS) versions 2.7.x through 2.7.6, consider disabling support for OpenFlow 1.5 until a patch is available, as ovs-vswitchd does not enable it by default. As a temporary workaround, restrict the use of the parse group prop ntr selection method function in lib/ofp-util.c to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Assertion Failure

XSS

Weakness Enumeration

CWE-617

CWE-79

Related Identifiers

ALT-PU-2018-2159

BDU:2019-00706

CVE-2018-17204

DLA-2571-1

OPENSUSE-SU-2018_4148-1

RHSA-2018:3500

RHSA-2019:0053

RHSA-2019:0081

SUSE-SU-2018:4128-1

SUSE-SU-2018_4128-1

USN-3873-1

Affected Products

Alt Linux

Openvswitch

Suse

Ubuntu

References · 26

• https://github.com/openvswitch/ovs/commit/4af6da3b275b764b1afe194df6499b33d2bf4cde · Patch
• https://osv.dev/vulnerability/SUSE-SU-2018:4128-1 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2571-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-17205 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-17204 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2019:0081 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2018-17204 · Vendor Advisory
• https://usn.ubuntu.com/3873-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-3873-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-17204 · Vendor Advisory
• https://osv.dev/vulnerability/USN-3873-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2018:3500 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-17204 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2018-17204 · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-17204 · Vendor Advisory