Vulnerability Name:

CVE-2019-25076 (CCN-235841)

Assigned:2020-12-10
Published:2020-12-10
Updated:2022-09-13
Summary:The TSS (Tuple Space Search) algorithm in Open vSwitch 2.x through 2.17.2 and 3.0.0 allows remote attackers to cause a denial of service (delays of legitimate traffic) via crafted packet data that requires excessive evaluation time within the packet classification algorithm for the MegaFlow cache, aka a Tuple Space Explosion (TSE) attack.
CVSS v3 Severity:5.8 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L)
5.1 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Changed
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.7 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:U/RC:R)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-noinfo
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-25076

Source: MISC
Type: Third Party Advisory
https://arxiv.org/abs/2011.09107

Source: MISC
Type: Third Party Advisory
https://dl.acm.org/citation.cfm?doid=3359989.3365431

Source: XF
Type: UNKNOWN
openvswitch-cve201925076-dos(235841)

Source: MISC
Type: Exploit, Third Party Advisory
https://sites.google.com/view/tuple-space-explosion

Source: CCN
Type: Open vSwitch Web site
Open vSwitch

Source: MISC
Type: Exploit, Third Party Advisory
https://www.youtube.com/watch?v=5cHpzVK0D28

Source: CCN
Type: YouTube Web site
The Discrepancy of the Megaflow Cache in OVS, Final Episode

Source: MISC
Type: Exploit, Third Party Advisory
https://www.youtube.com/watch?v=DSC3m-Bww64

Vulnerable Configuration:Configuration 1:
  • cpe:/a:openvswitch:openvswitch:3.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:openvswitch:openvswitch:*:*:*:*:*:*:*:* (Version >= 2.0.0 and <= 2.17.2)

    • * Denotes that component is vulnerable
    BACK
    openvswitch openvswitch 3.0.0
    openvswitch openvswitch *