6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
9.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
0.001 Low
EPSS
Percentile
42.8%
Revision | Date | Changes |
---|---|---|
1.0 | August 20th, 2021 | Initial Release |
The CVE-ID tracking this issue: CVE-2021-28494
CVSSv3.1 Base Score: 9.6( CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H)
This advisory documents the impact of an internally found vulnerability in Aristaβs MOS (Metamako Operating System) software which is supported on the 7130 product line. The effect of this vulnerability is that, under certain conditions, authentication is bypassed by unprivileged users who are accessing the Web UI.
This issue was discovered internally and Arista is not aware of any malicious uses of this issue in customer networks.
Affected Software
MOS
Affected Platforms
The following products are affected by this vulnerability:
The following products are not affected:
Check if the installed software version falls under the list specified in the βAffected Softwareβ section:
Switch#show version
Device: Metamako MetaConnect 96 with E-Series
SKU: DCS-7130-96E
Serial number: C96E-A7-36803-2
Software image version: 0.26.5
<output omitted for brevity>
In the above example, as the Switch is running 0.26.5, it is exposed to the vulnerability.
Web UI access to the affected systems is enabled by default and can be disabled by using the following commands. However, note that this will break any automation that relies on Web UI or JSON API access to the system and should be used only if Web UI and JSON API access is not required for managing the system.
Switch#conf
Switch(config)#management http
Switch(conf-mgmt-http)#shutdown
Switch(conf-mgmt-http)#show http status
HTTP server status: Stopped
HTTP protocol: Secure
HTTP server port: 443
For the final resolution, please refer to the next section which lists the details of the remediated software versions.
This vulnerability is being tracked by BUG567401. The recommended resolution is to upgrade to a remediated MOS version during a maintenance window.
This vulnerability has been fixed in the following MOS version:
If you require further assistance, or if you have any further questions regarding this security notice, please contact the Arista Networks Technical Assistance Center (TAC) by one of the following methods:
By email: This email address is being protected from spambots. You need JavaScript enabled to view it.
By telephone: 408-547-5502 ; 866-476-0000
6.5 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
9.6 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
0.001 Low
EPSS
Percentile
42.8%