Advisory Details

July 10th, 2020

Phoenix Contact Automationworx PLCOpen XML File Parsing Stack-based Buffer Overflow Remote Code Execution Vulnerability

ZDI-20-825
ZDI-CAN-10147

CVE ID CVE-2020-12497
CVSS SCORE 7.8, (AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Phoenix Contact
AFFECTED PRODUCTS Automationworx
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Phoenix Contact Automationworx. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing of PLCOpen XML files. When parsing the pou element, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Phoenix Contact has issued an update to correct this vulnerability. More details can be found at:
https://us-cert.cisa.gov/ics/advisories/icsa-20-191-01
DISCLOSURE TIMELINE
  • 2020-04-02 - Vulnerability reported to vendor
  • 2020-07-10 - Coordinated public release of advisory
CREDIT Natnael Samson (@NattiSamson)
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