Vulnerabilities > CVE-2016-2074 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
Buffer overflow in lib/flow.c in ovs-vswitchd in Open vSwitch 2.2.x and 2.3.x before 2.3.3 and 2.4.x before 2.4.1 allows remote attackers to execute arbitrary code via crafted MPLS packets, as demonstrated by a long string in an ovs-appctl command.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 5 | |
| Application | 1 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_B53BBF58257F11E69F4D20CF30E32F6D.NASL description Open vSwitch reports : Multiple versions of Open vSwitch are vulnerable to remote buffer overflow attacks, in which crafted MPLS packets could overflow the buffer reserved for MPLS labels in an OVS internal data structure. The MPLS packets that trigger the vulnerability and the potential for exploitation vary depending on version : Open vSwitch 2.1.x and earlier are not vulnerable. In Open vSwitch 2.2.x and 2.3.x, the MPLS buffer overflow can be exploited for arbitrary remote code execution. In Open vSwitch 2.4.x, the MPLS buffer overflow does not obviously lead to a remote code execution exploit, but testing shows that it can allow a remote denial of service. See the mitigation section for details. Open vSwitch 2.5.x is not vulnerable. last seen 2020-06-01 modified 2020-06-02 plugin id 91375 published 2016-05-31 reporter This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/91375 title FreeBSD : openvswitch -- MPLS buffer overflow (b53bbf58-257f-11e6-9f4d-20cf30e32f6d) NASL family Misc. NASL id CITRIX_XENSERVER_CTX232655.NASL description The version of Citrix XenServer running on the remote host is missing a security hotfix. It is, therefore, affected by multiple vulnerabilities. last seen 2020-06-01 modified 2020-06-02 plugin id 108887 published 2018-04-06 reporter This script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/108887 title Citrix XenServer Multiple Vulnerabilities (CTX232655) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201701-07.NASL description The remote host is affected by the vulnerability described in GLSA-201701-07 (Open vSwitch: Remote execution of arbitrary code) A buffer overflow was discovered in lib/flow.c in ovs-vswitchd. Impact : A remote attacker, using a specially crafted MPLS packet, could execute arbitrary code. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 96238 published 2017-01-03 reporter This script is Copyright (C) 2017 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/96238 title GLSA-201701-07 : Open vSwitch: Remote execution of arbitrary code NASL family Debian Local Security Checks NASL id DEBIAN_DSA-3533.NASL description Kashyap Thimmaraju and Bhargava Shastry discovered a remotely triggerable buffer overflow vulnerability in openvswitch, a production quality, multilayer virtual switch implementation. Specially crafted MPLS packets could overflow the buffer reserved for MPLS labels in an OVS internal data structure. A remote attacker can take advantage of this flaw to cause a denial of service, or potentially, execution of arbitrary code. last seen 2020-06-01 modified 2020-06-02 plugin id 90252 published 2016-03-29 reporter This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/90252 title Debian DSA-3533-1 : openvswitch - security update NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2016-0615.NASL description Updated openvswitch packages that fix one security issue are now available for Red Hat OpenShift Enterprise 3.1. Red Hat Product Security has rated this update as having Important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. OpenShift Enterprise by Red Hat is the company last seen 2020-06-12 modified 2018-12-04 plugin id 119369 published 2018-12-04 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/119369 title RHEL 7 : openvswitch (RHSA-2016:0615)
Redhat
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References
- http://openvswitch.org/pipermail/announce/2016-March/000082.html
- http://openvswitch.org/pipermail/announce/2016-March/000082.html
- http://openvswitch.org/pipermail/announce/2016-March/000083.html
- http://openvswitch.org/pipermail/announce/2016-March/000083.html
- http://rhn.redhat.com/errata/RHSA-2016-0523.html
- http://rhn.redhat.com/errata/RHSA-2016-0523.html
- http://rhn.redhat.com/errata/RHSA-2016-0524.html
- http://rhn.redhat.com/errata/RHSA-2016-0524.html
- http://rhn.redhat.com/errata/RHSA-2016-0537.html
- http://rhn.redhat.com/errata/RHSA-2016-0537.html
- http://www.debian.org/security/2016/dsa-3533
- http://www.debian.org/security/2016/dsa-3533
- http://www.securityfocus.com/bid/85700
- http://www.securityfocus.com/bid/85700
- https://access.redhat.com/errata/RHSA-2016:0615
- https://access.redhat.com/errata/RHSA-2016:0615
- https://bugzilla.redhat.com/show_bug.cgi?id=1318553
- https://bugzilla.redhat.com/show_bug.cgi?id=1318553
- https://security.gentoo.org/glsa/201701-07
- https://security.gentoo.org/glsa/201701-07
- https://security-tracker.debian.org/tracker/CVE-2016-2074
- https://security-tracker.debian.org/tracker/CVE-2016-2074
- https://support.citrix.com/article/CTX232655
- https://support.citrix.com/article/CTX232655