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CVE-2017-9856: Sniffed passwords from SMAdata2+ communication can be decrypted very easily.

CVE-2017-9856 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. Sniffed passwords from SMAdata2+ communication can be decrypted very easily. The passwords are "encrypted" using a very simple encryption algorithm. This enables an attacker to find the plaintext passwords and authenticate to the device. NOTE: the vendor reports that 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-256: Plaintext Storage of a Password

The product stores a password in plaintext within resources such as memory or files.

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