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CVE-2017-7905: Ge Multilin Sr 750 Feeder Protection Relay Firmware: Weak Encoding for Password

CVE-2017-7905 is rated critical with a CVSS v3.0 base score of 9.8 and affects Ge Multilin Sr 750 Feeder Protection Relay Firmware, along with 8 other products in NVD’s configuration data. 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

A Weak Cryptography for Passwords issue was discovered in General Electric (GE) Multilin SR 750 Feeder Protection Relay, firmware versions prior to Version 7.47; SR 760 Feeder Protection Relay, firmware versions prior to Version 7.47; SR 469 Motor Protection Relay, firmware versions prior to Version 5.23; SR 489 Generator Protection Relay, firmware versions prior to Version 4.06; SR 745 Transformer Protection Relay, firmware versions prior to Version 5.23; SR 369 Motor Protection Relay, all firmware versions; Multilin Universal Relay, firmware Version 6.0 and prior versions; and Multilin URplus (D90, C90, B95), all versions. Ciphertext versions of user passwords were created with a non-random initialization vector leaving them susceptible to dictionary attacks. Ciphertext of user passwords can be obtained from the front LCD panel of affected products and through issued Modbus commands.

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-261: Weak Encoding for Password

The product uses a weak or trivial encoding for a password.

CWE-326: Inadequate Encryption Strength

The product stores or transmits sensitive data using an encryption scheme that is theoretically sound, but is not strong enough for the level of protection required.

CWE-330: Use of Insufficiently Random Values

The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

Affected products

  • Ge Multilin Sr 750 Feeder Protection Relay Firmware: up to and including 5.02
  • Ge Multilin Universal Relay Firmware: up to and including 6.0
  • Ge Multilin Sr 760 Feeder Protection Relay Firmware: up to and including 5.02
  • Ge Multilin Sr 469 Motor Protection Relay Firmware: up to and including 2.90
  • Multilin Sr 489 Generator Protection Relay Firmware: up to and including 1.53
  • Ge Multilin Sr 745 Transformer Protection Relay Firmware: up to and including 2.85
  • Ge Multilin Sr 369 Motor Protection Relay Firmware: all versions listed by NVD
  • Ge Multilin Urplus D90 Firmware: all versions listed by NVD
  • Ge Multilin Urplus C90 Firmware: all versions listed by NVD
  • Ge Multilin Urplus B95 Firmware: all versions listed by NVD

References