9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
56.6%
Revision | Date | Changes |
---|---|---|
1.0 | August 20th, 2021 | Initial Release |
The CVE-ID tracking this issue: CVE-2021-28495
CVSSv3.1 Base Score: 7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)
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. Under certain conditions, user authentication can be bypassed when API access is enabled via the JSON-RPC APIs.
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:
To check the version of MOS running on the system, use the following commands
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.
Check if API access is enabled:
Switch#show api status
JSON API server status: Started
In the above example, the output of the command shows that the API server is in the βStartedβ state (highlighted) and hence enabled. This setting is required for the device to be vulnerable.
API access to the affected systems can be disabled by using the following commands. However, note that this will break any automation that relies on API access to the system and should be used only if API access is not required for managing the system.
Switch#conf
Switch(config)#management api
Switch(config-mgmt-api)#shutdown
Switch(config-mgmt-api)#show api status
JSON API server status: Stopped
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 BUG567400. 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:
A hotfix has been implemented as an extension, which can be downloaded from the following link. Note that in addition to patches for the vulnerability described in this security advisory 66, this hotfix also contains patches for vulnerabilities covered under security advisories 64 and 65.
The above hotfix is applicable to the following releases:.
The above hotfix is applicable to the following releases:
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
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.7 High
AI Score
Confidence
High
6.8 Medium
CVSS2
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
0.002 Low
EPSS
Percentile
56.6%