CVE-2017-7924 : An Improper Input Validation issue was discovered in Rockwell Automation MicroLo

An Improper Input Validation issue was discovered in Rockwell Automation MicroLogix 1100 controllers 1763-L16BWA, 1763-L16AWA, 1763-L16BBB, and 1763-L16DWD. A remote, unauthenticated attacker could send a single, specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition.

Published 2017-09-20 16:29:01

Updated 2019-10-09 23:29:59

Source ICS-CERT

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2017-7924

Rockwellautomation » 1763-l16bwa Firmware » Version: N/A
cpe:2.3:o:rockwellautomation:1763-l16bwa_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Rockwellautomation » 1763-l16bwa » Version: N/A
Rockwellautomation » 1763-l16awa Firmware » Version: N/A
cpe:2.3:o:rockwellautomation:1763-l16awa_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Rockwellautomation » 1763-l16awa » Version: N/A
Rockwellautomation » 1763-l16bbb Firmware » Version: N/A
cpe:2.3:o:rockwellautomation:1763-l16bbb_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Rockwellautomation » 1763-l16bbb » Version: N/A
Rockwellautomation » 1763-l16dwd Firmware » Version: N/A
cpe:2.3:o:rockwellautomation:1763-l16dwd_firmware:-:*:*:*:*:*:*:*
Matching versions
When used together with: Rockwellautomation » 1763-l16dwd » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2017-7924

EPSS FAQ

3.35%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 91 %

Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2017-7924

DoS Exploitation of Allen-Bradley's Legacy Protocol (PCCC)

First seen: 2020-04-26

auxiliary/dos/scada/allen_bradley_pccc

A remote, unauthenticated attacker could send a single, specially crafted Programmable Controller Communication Commands (PCCC) packet to the controller that could potentially cause the controller to enter a DoS condition. MicroLogix 1100 controllers are affected: 17

More information

CVSS scores for CVE-2017-7924

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.5	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2017-7924

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Assigned by:
- ics-cert@hq.dhs.gov (Secondary)
- nvd@nist.gov (Primary)

References for CVE-2017-7924

http://www.securityfocus.com/bid/99622

Rockwell Automation MicroLogix 1100 CVE-2017-7924 Remote Denial of Service Vulnerability
Third Party Advisory;VDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-17-138-03

Rockwell Automation MicroLogix 1100 Controllers | CISA
Mitigation;Third Party Advisory;US Government Resource

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