Integer underflow in Red Hat OpenStack - CVE-2017-9214

Vulnerability identifier: #VU8433

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-9214

CWE-ID: CWE-191

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the Open vSwitch (OvS) component due to unsigned integer underflow in the function ofputil_pull_queue_get_config_reply10 in lib/ofp-util.c. when parsing of OFPT_QUEUE_GET_CONFIG_REPLY messages. A remote attacker can send a specially crafted OFPT_QUEUE_GET_CONFIG_REPLY message, trigger buffer over-read and cause the application to crash.

Successful exploitation of the vulnerability results in denial of service.

Red Hat OpenStack
Red Hat Virtualization
Red Hat Enterprise Linux Fast Datapath
Ubuntu
Fedora
openvswitch (Red Hat package)
openvswitch

Install update from vendor's website.

Red Hat OpenStack - addressed in versions 10.0, 11.0
openvswitch (Red Hat package) - addressed in versions 2.4.1-2.git20160727.el7ost, 2.6.1-13.git20161206.el7ost, 2.7.2-1.git20170719.el7fdp
openvswitch - addressed in versions 2.7.0-4.fc26, 2.7.0-5.fc26

• https://access.redhat.com/errata/RHSA-2017:2698

• Multiple vulnerabilities in Red Hat OpenStack
• Ubuntu update for Open vSwitch
• Red Hat update for openvswitch
• Red Hat update for openvswitch
• Fedora 26 update for openvswitch
• Fedora 26 update for openvswitch
• Fast Datapath for Red Hat Enterprise Linux 7 update for openvswitch
• Red Hat Enterprise Linux OpenStack Platform 6 update for openvswitch
• Multiple vulnerabilities in Red Hat OpenStack 10.0 packages
• Multiple vulnerabilities in Red Hat OpenStack 11.0 packages