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CVE-2018-17903: Sagaradio Saga1 L8b Firmware: Authentication Bypass by Capture-replay

CVE-2018-17903 is rated critical with a CVSS v3.1 base score of 9.1 and NVD lists Sagaradio Saga1 L8b Firmware as the affected product. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.

Vulnerability description

SAGA1-L8B with any firmware versions prior to A0.10 are vulnerable to a replay attack and command forgery.

Severity breakdown

CVSS v3.1 9.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: None. No loss of confidentiality.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-294: Authentication Bypass by Capture-replay

A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).

Affected products

  • Sagaradio Saga1 L8b Firmware: before a0.10

References