Vulnerability CVE-2017-7901


Published: 2017-06-29   Modified: 2017-06-30

Description:
A Predictable Value Range from Previous Values issue was discovered in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable-logic controllers 1763-L16AWA, Series A and B, Version 16.00 and prior versions; 1763-L16BBB, Series A and B, Version 16.00 and prior versions; 1763-L16BWA, Series A and B, Version 16.00 and prior versions; and 1763-L16DWD, Series A and B, Version 16.00 and prior versions and Allen-Bradley MicroLogix 1400 programmable logic controllers 1766-L32AWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWA, Series A and B, Version 16.00 and prior versions; 1766-L32BWAA, Series A and B, Version 16.00 and prior versions; 1766-L32BXB, Series A and B, Version 16.00 and prior versions; 1766-L32BXBA, Series A and B, Version 16.00 and prior versions; and 1766-L32AWAA, Series A and B, Version 16.00 and prior versions. Insufficiently random TCP initial sequence numbers are generated, which may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections, resulting in a denial of service for the target device.

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
9/10
8.5/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Complete
Affected software
Rockwellautomation -> 1766-l32bwa series b 
Rockwellautomation -> 1766-l32bxba series b 
Rockwellautomation -> 1763-l16bwa series b 
Rockwellautomation -> 1766-l32bwaa series a 
Rockwellautomation -> 1766-l32bwa series a 
Rockwellautomation -> 1763-l16dwd series b 
Rockwellautomation -> 1763-l16bwa series a 
Rockwellautomation -> 1763-l16dwd series a 
Rockwellautomation -> 1766-l32awa series b 
Rockwellautomation -> 1766-l32awaa series a 
Rockwellautomation -> 1763-l16bbb series a 
Rockwellautomation -> 1766-l32awaa series b 
Rockwellautomation -> 1763-l16awa series a 
Rockwellautomation -> 1763-l16awa series b 
Rockwellautomation -> 1763-l16bbb series b 
Rockwellautomation -> 1766-l32bwaa series b 
Rockwellautomation -> 1766-l32bxb series b 
Rockwellautomation -> 1766-l32awa series a 
Rockwellautomation -> 1766-l32bxba series a 
Rockwellautomation -> 1766-l32bxb series a 

 References:
http://www.securitytracker.com/id/1038546
https://ics-cert.us-cert.gov/advisories/ICSA-17-115-04

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