#VU8433 Integer underflow in Red Hat OpenStack - CVE-2017-9214

Vulnerability identifier: #VU8433

Vulnerability risk: Low

CVSSv4.0: 2.7 [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/E:U/U:Clear]

CVE-ID: CVE-2017-9214

CWE-ID: CWE-191

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Red Hat OpenStack
Server applications / Other server solutions

Vendor: Red Hat Inc.

Description
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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Red Hat OpenStack: 7.0

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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.