An exploitable stack buffer overflow vulnerability vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200. An attacker can send a specially crafted packet to trigger the parsing of this cache file.At 0x1eb9c the extracted interface element name from the xml file is used as an argument to /etc/config-tools/config_interfaces interface=<contents of interface element> using sprintf(). The destination buffer sp+0x40 is overflowed with the call to sprintf() for any interface values that are greater than 512-len("/etc/config-tools/config_interfaces interface=") in length. Later, at 0x1ea08 strcpy() is used to copy the contents of the stack buffer that was overflowed sp+0x40 into sp+0x440. The buffer sp+0x440 is immediately adjacent to sp+0x40 on the stack. Therefore, there is no NULL termination on the buffer sp+0x40 since it overflowed into sp+0x440. The strcpy() will result in invalid memory access. An interface value of length 0x3c4 will cause the service to crash.
References
| Link | Resource |
|---|---|
| https://talosintelligence.com/vulnerability_reports/TALOS-2019-0966 | Exploit Mitigation Third Party Advisory |
| https://talosintelligence.com/vulnerability_reports/TALOS-2019-0966 | Exploit Mitigation Third Party Advisory |
Configurations
Configuration 1 (hide)
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History
21 Nov 2024, 04:44
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://talosintelligence.com/vulnerability_reports/TALOS-2019-0966 - Exploit, Mitigation, Third Party Advisory |
Information
Published : 2020-03-23 14:15
Updated : 2024-11-21 04:44
NVD link : CVE-2019-5186
Mitre link : CVE-2019-5186
CVE.ORG link : CVE-2019-5186
JSON object : View
Products Affected
wago
- pfc200_firmware
- pfc200