QID 43821

Date Published: 2021-11-11

QID 43821: Arista EOS Domain Name System (DNS) cache poisoning Vulnerability (SA0061)

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.

Dnsmasq is vulnerable to memory corruption and cache poisoning

Affected EOS versions: 4.25.1F and below releases in the 4.25.x train 4.24.3.1M and below releases in the 4.24.x train 4.23.6M and below releases in the 4.23.x train 4.22.8.1F and below releases in the 4.22.x train 4.21.13M and below releases in the 4.21.x train QID Detection Logic (Authenticated):
The check matches Arista EOS version retrieved via Unix Auth using "show version" command.

The issues with dnsmasq may result in the DNS cache being poisoned by a malicious attacker. The impact is that other clients querying the EOS switch as a DNS server would receive invalid DNS records.

CVSS V3 rated as Medium - 3.7 severity.

CVSS V2 rated as Medium - 4.3 severity.

Solution

Refer to Arista Security Advisory SA0061 for patch details.

Vendor References

Arista:Security Advisory 0061 - www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61

CVEs related to QID 43821

CVE-2020-25684 | CVE-2020-25685 | CVE-2020-25686 |

Software Advisories

Advisory ID	Software	Component	Link
Security Advisory 0061			www.arista.com/en/support/advisories-notices/security-advisories/12135-security-advisory-61

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