Summaryinfo

A vulnerability was found in WAGO PFC 200. It has been classified as critical. Affected is the function sprintf of the component iocheckd Service. The manipulation as part of Crafted Packet leads to buffer overflow. This vulnerability is traded as CVE-2019-5185. An attack has to be approached locally. There is no exploit available. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Detailsinfo

A vulnerability was found in WAGO PFC 200 (the affected version unknown) and classified as critical. This issue affects the function sprintf of the component iocheckd Service. The manipulation as part of a Crafted Packet leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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 0x1ea28 the extracted state value from the xml file is used as an argument to /etc/config-tools/config_interfaces interface=X1 state=<contents of state node> using sprintf(). The destination buffer sp+0x40 is overflowed with the call to sprintf() for any state values that are greater than 512-len("/etc/config-tools/config_interfaces interface=X1 state=") 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 state value of length 0x3c9 will cause the service to crash.

The weakness was published 03/23/2020. The identification of this vulnerability is CVE-2019-5185 since 01/04/2019. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit.

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

Similar entries are available at VDB-152016 and VDB-152014. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• WAGO

Name

• PFC 200

License

• commercial

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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