CVE-2019-5181: wago pfc200_firmware Out-of-bounds Write

Vulnerability summary

CVE-2019-5181 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in wago pfc200_firmware. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.4% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 11-03-2020
   PublishedVulnerability first disclosed.
2. 04-08-2024
   Last modifiedVulnerability information updated.

Description

An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service ‘I/O-Check’ functionality of WAGO PFC 200 Firmware version 03.02.02(14). A specially crafted XML cache file written to a specific location on the device can cause a stack buffer overflow, resulting in code execution. An attacker can send a specially crafted packet to trigger the parsing of this cache file. The destination buffer sp+0x440 is overflowed with the call to sprintf() for any subnetmask values that are greater than 1024-len(‘/etc/config-tools/config_interfaces interface=X1 state=enabled subnet-mask=‘) in length. A subnetmask value of length 0x3d9 will cause the service to crash.

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.