Wago: Buffer Copy without Checking Size of Input in wbm of multiple products

Versions reported by the vendor

Affected version ranges reported by the assigning authority (CERTVDE). Independent of NVD's CPE analysis and usually ahead of it.

• WAGO Controller BACnet MS/TP

  • up to and including FW13affected

• WAGO Controller BACnet/IP

  • up to and including FW13affected

• WAGO Ethernet Controller 3rd Generation

  • up to and including FW13affected
  • up to and including FW13affected

• WAGO Fieldbus Coupler Ethernet 3rd Generation

  • up to and including FW13affected

Other highest-scoring records for the same primary product.

• CVE-2018-25090Wago: Improper Neutralization of Input During Web Page Generation in multiple devices
  21Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1char buf[256];2memcpy(buf, pkt->data, pkt->len);

1char buf[256];2if (pkt->len > sizeof(buf)) {3  return -EINVAL;4}5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.