QID 43818

Date Published: 2021-05-17

QID 43818: Arista EOS Privilege Escalation Vulnerability (SA0056)

Arista EOS is the Worlds Most Advanced Network Operating System.

Arista EOS is a fully programmable and highly modular, Linux-based network operation system, using familiar industry standard CLI and runs a single binary software image across the Arista switching family.

The effect of this vulnerability is that malformed packets can be incorrectly forwarded across VLAN boundaries in one direction. This vulnerability is only susceptible to exploitation by unidirectional traffic (ex. UDP) and not bidirectional traffic (ex. TCP).

The manipulation with an unknown input leads to a privilege escalation vulnerability.

Affected EOS versions: 4.21.4.1F and below releases in the 4.21.x train. 4.21.11M and below releases in the 4.21.x train. 4.22.6M and below releases in the 4.22.x train. 4.23.4M and below releases in the 4.23.x train. 4.24.2.1F and below releases in the 4.24.x train. QID Detection Logic (Authenticated):
The check matches Arista EOS version retrieved via Unix Auth using "show version" command.

This vulnerability could be exploited to cause malformed packets can be incorrectly forwarded across VLAN boundaries in one direction.

CVSS V3 rated as Medium - 5.3 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Refer to Arista Security Advisory SA0056 for patch details.

Vendor References

Arista:Security Advisory 0056 - www.arista.com/en/support/advisories-notices/security-advisories/11996-security-advisory-56

CVEs related to QID 43818

CVE-2020-15898 |

Software Advisories

Advisory ID	Software	Component	Link
Security Advisory 0056			www.arista.com/en/support/advisories-notices/security-advisories/11996-security-advisory-56

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