Summaryinfo

A vulnerability was found in WAGO PFC 200. It has been declared as critical. Affected by this vulnerability is the function sprintf of the component iocheckd Service. The manipulation as part of Crafted Packet leads to buffer overflow. This vulnerability is known as CVE-2019-5186. Local access is required to approach this attack. There is no exploit available. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Detailsinfo

A vulnerability was found in WAGO PFC 200 (the affected version is unknown). It has been classified as critical. Affected is the function sprintf of the component iocheckd Service. The manipulation as part of a Crafted Packet leads to a buffer overflow vulnerability. CWE is classifying the issue as CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was released 03/23/2020. This vulnerability is traded as CVE-2019-5186 since 01/04/2019. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Entries connected to this vulnerability are available at VDB-152015 and VDB-152014. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• WAGO

Name

• PFC 200

License

• commercial

CPE 2.3info

• 🔍

CPE 2.2info

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