QID 43814

QID 43814: Arista EOS Authentication vulnerability (SA0054)

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 the vulnerability is dependent on the routing protocol mode configuration. The IS-IS protocol (in Multi-Agent mode) or all layer 3 protocols (in Ribd, single routing agent mode) can be affected if the IS-IS Router receives a malformed link-state PDU. The effect will be agent restarts (Rib process or IS-IS process, depending on the routing protocol mode) that could trigger route churn, which may subsequently result in traffic loss or incorrect forwarding of traffic.

This is an internally found vulnerability and Arista has not received any report of this issue being used in any malicious manner.

Affected EOS/vEOS versions: 4.24.1F and below release in the 4.24.x train. 4.23.4M and below releases in the 4.23.x train. 4.22.6M and below releases in the 4.22.x train. 4.21.10M and below releases in the 4.21.x train. All releases in the 4.20.x train QID Detection Logic (Authenticated):
The check matches Arista EOS version retrieved via Unix Auth using "show version" command.

Successful exploitation Leads to arbitrary remote code execution by an attacker without requiring credentials.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Refer to Arista Security Advisory SA0054 for patch details.

Vendor References

Arista:Security Advisory 0054 - www.arista.com/en/support/advisories-notices/security-advisories/11760-security-advisory-54

CVEs related to QID 43814

CVE-2020-15897 |

Software Advisories

Advisory ID	Software	Component	Link
Security Advisory 0054			www.arista.com/en/support/advisories-notices/security-advisories/11760-security-advisory-54

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