4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
12.6%
Revision | Date | Changes |
---|---|---|
1.0 | August 20th, 2021 | Initial Release |
The CVE-ID tracking this issue: CVE-2021-28493
CVSSv3.1 Base Score: 8.4 (CVSS:3.1/AV:L/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, a user may be able to execute commands despite not having the privileges to do so.
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.
The following workarounds may be leveraged as mitigation:
Change home directory permission for privileged groups
switch# bash chown -R $USER:admins $HOME
Change .bashrc to limit permissions
switch# bash chmod -R u-w,g-X $HOME
To make the mitigation persistent across reboots, please add the steps above in startup-config with the command below:
switch# bash echo $'bash find /home/* -maxdepth 0 -type d -exec sh -c \'chown -R \"$(basename {}):admins\" \"{}\" && chmod -R u-w,g-X \"{}\"\' \;' >> /mnt/flash/startup-config
This vulnerability is being tracked by BUG567402. 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
4.6 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
12.6%