7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
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
6.5 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
12.6%
Revision | Date | Changes |
---|---|---|
1.0 | August 20th, 2021 | Initial Release |
The CVE-ID tracking this issue: CVE-2021-28498
CVSSv3.1 Base Score: 8.7 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H)
The CVE-ID tracking this issue: CVE-2021-28499
CVSSv3.1 Base Score: 6.3 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L)
This advisory documents the impact of two internally found vulnerabilities in Arista’s MOS (Metamako Operating System) software which is supported on the 7130 product line. The vulnerabilities involve user account passwords (CVE-2021-28499) or enable passwords (CVE-2021-28498) set in clear text could result in unprivileged users getting complete access to the systems.
Both issues were 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. During the creation of local user accounts, if the option of ‘0’ or ‘plaintext’ was used like shown in the example below, the password will be stored in clear text in the running configuration and any subsequent outputs that use the running configuration like the ‘show tech-support’ command. This has been addressed in the fixed releases noted in the ‘Resolution’ section of this advisory.
switch(conf)#username test secret 0 opensesame
A simple configuration change that aligns with security best practice can be used as an immediate mitigation. Follow the steps below:
Change the password for user accounts and the enable password and set them with SHA512 option.
switch# config
switch(conf)#username bill privilege 2 secret sha512 $6$VclX0m78qOPNJLBD$g.B61.fmqMxfDlkMC1waI1BQ9fqFD66mxdlZwbaefIdgoArFr5HV3qHOgbSZkUXrpBztj6GE.61jxFDsO/45b
In the above example, the highlighted portion of the output is the encrypted string.
2. Clear device log messages
switch# bash sudo rm -f /var/log/messages*
Clear CLI history
switch# clear history
For the final resolution, please refer to the next section which lists the details of the remediated software versions.
These vulnerabilities are being tracked by the following bug IDs - BUG567393 (CVE-2021-28499) and BUG567395 (CVE-2021-28498). The recommended resolution is to upgrade to a remediated MOS version during a maintenance window or to install the hotfix.
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 these two vulnerabilities described in this security advisory 64, this hotfix also contains patches for vulnerabilities covered under security advisories 65 and 66.
The above hotfix is applicable to the following releases:
To install the hotfix, follow these instructions:
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
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
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
6.5 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
12.6%