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SSH Terrapin (CVE-2023-48795) Vulnerability on Cisco 9336C-FX2 Switches

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Applies to

  • Cisco Nexus 9336C-FX2
  • Cluster Switches (N9K-C9336C-FX2)
  • Cisco NX-OS Software (specifically versions 10.3(4a)
  • NetApp environments using Cisco-supported cluster switches
  • Vulnerability: CVE-2023-48795 (SSH Terrapin Prefix Truncation Weakness)

Issue

  • A security scan reported the following on Cisco Nexus9336C-FX2 cluster switches

SSHTerrapinPrefixTruncationWeakness(CVE-2023-48795)

Synopsis: The remote SSH server is vulnerable to a mitm prefix truncation attack.

Description: The remote SSH server is vulnerable to a man-in-the-middle prefix truncation weakness known as Terrapin. This can allow a remote, man-in-the-middle attacker to bypass integrity checks and downgrade the connection's security.

  • The affected switches were running Cisco NX-OS version 10.3(4a).

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