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CVE-2017-9853: NOTE: the vendor reports that the 12-character limit provides "a very high security standard." Also, only…

CVE-2017-9853 is rated critical with a CVSS v3.0 base score of 9.8 and NVD lists 39 affected products, including Sma Sunny Boy 3600 Firmware. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

An issue was discovered in SMA Solar Technology products. All inverters have a very weak password policy for the user and installer password. No complexity requirements or length requirements are set. Also, strong passwords are impossible due to a maximum of 12 characters and a limited set of characters. NOTE: the vendor reports that the 12-character limit provides "a very high security standard." Also, only Sunny Boy TLST-21 and TL-21 and Sunny Tripower TL-10 and TL-30 could potentially be affected

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • 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-521: Weak Password Requirements

The product does not require that users should have strong passwords.

Affected products

  • Sma Sunny Boy 3600 Firmware: all versions listed by NVD
  • Sma Sunny Boy 5000 Firmware: all versions listed by NVD
  • Sma Sunny Tripower Core1 Firmware: all versions listed by NVD
  • Sma Sunny Tripower 15000tl Firmware: all versions listed by NVD
  • Sma Sunny Tripower 20000tl Firmware: all versions listed by NVD
  • Sma Sunny Tripower 25000tl Firmware: all versions listed by NVD
  • Sma Sunny Tripower 5000tl Firmware: all versions listed by NVD
  • Sma Sunny Tripower 12000tl Firmware: all versions listed by NVD
  • Sma Sunny Tripower 60 Firmware: all versions listed by NVD
  • Sma Sunny Boy 3000tl Firmware: all versions listed by NVD
  • Sma Sunny Boy 3600tl Firmware: all versions listed by NVD
  • Sma Sunny Boy 4000tl Firmware: all versions listed by NVD
  • Sma Sunny Boy 5000tl Firmware: all versions listed by NVD
  • Sma Sunny Boy 1.5 Firmware: all versions listed by NVD
  • Sma Sunny Boy 2.5 Firmware: all versions listed by NVD

References