CVE-2017-7901
First published: Fri Jun 30 2017(Updated: )
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.
Credit: ics-cert@hq.dhs.gov
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Rockwell Automation 1763-L16AWA Series A | <=16.000 | |
| Rockwell Automation 1763-L16AWA Series B | <=16.000 | |
| Rockwell Automation 1763-L16BBB Series A | <=16.000 | |
| Rockwell Automation 1763-L16BBB Series B | <=16.000 | |
| Rockwell Automation 1763-L16BWA Series A | <=16.000 | |
| Rockwell Automation 1763-L16AWA Series B | <=16.000 | |
| Rockwell Automation 1763-L16DWD Series A | <=16.000 | |
| Rockwell Automation 1763-L16DWD Series B | <=16.000 | |
| Rockwell Automation MicroLogix | =1100 | |
| Rockwell Automation 1766-L32AWA Series A | <=16.000 | |
| Rockwell Automation 1766-L32AWA Series B | <=16.000 | |
| Rockwell Automation 1766-L32AWAA Series A | <=16.000 | |
| Rockwell Automation 1766-L32AWAA Series B | <=16.000 | |
| Rockwell Automation 1766-L32BWA Series A | <=16.000 | |
| Rockwell Automation 1766-L32BWA Series B | <=16.000 | |
| Rockwell Automation 1766-L32BWAA Series A | <=16.000 | |
| Rockwell Automation 1766-L32BWAA Series A | <=16.000 | |
| Rockwell Automation 1766-L32BXB Series A | <=16.000 | |
| Rockwell Automation 1766-L32BXB Series B | <=16.000 | |
| Rockwell Automation 1766-L32BXBA Series A | <=16.000 | |
| Rockwell Automation 1766-L32BXBA Series B | <=16.000 | |
| Rockwell Automation MicroLogix | =1400 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2017-7901?
CVE-2017-7901 is classified as a medium severity vulnerability.
How do I fix CVE-2017-7901?
To fix CVE-2017-7901, update the affected Rockwell Automation MicroLogix 1100 programmable-logic controllers to the latest firmware version beyond 16.00.
What systems are affected by CVE-2017-7901?
CVE-2017-7901 affects Rockwell Automation Allen-Bradley MicroLogix 1100 controllers, specifically the Series A and B versions with firmware version 16.00 and prior.
What is the nature of the vulnerability CVE-2017-7901?
CVE-2017-7901 involves a predictable value range derived from previous values, which could lead to unauthorized access or manipulation.
Is CVE-2017-7901 publicly known?
Yes, CVE-2017-7901 is publicly disclosed and documented in security vulnerability databases.
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- agent/tags
- agent/softwarecombine
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- agent/software-canonical-lookup-request
- vendor/rockwellautomation
- canonical/rockwell automation 1763-l16awa series a
- version/rockwell automation 1763-l16awa series a/16.000
- canonical/rockwell automation 1763-l16awa series b
- version/rockwell automation 1763-l16awa series b/16.000
- canonical/rockwell automation 1763-l16bbb series a
- version/rockwell automation 1763-l16bbb series a/16.000
- canonical/rockwell automation 1763-l16bbb series b
- version/rockwell automation 1763-l16bbb series b/16.000
- canonical/rockwell automation 1763-l16bwa series a
- version/rockwell automation 1763-l16bwa series a/16.000
- canonical/rockwell automation 1763-l16dwd series a
- version/rockwell automation 1763-l16dwd series a/16.000
- canonical/rockwell automation 1763-l16dwd series b
- version/rockwell automation 1763-l16dwd series b/16.000
- canonical/rockwell automation micrologix
- version/rockwell automation micrologix/1100
- canonical/rockwell automation 1766-l32awa series a
- version/rockwell automation 1766-l32awa series a/16.000
- canonical/rockwell automation 1766-l32awa series b
- version/rockwell automation 1766-l32awa series b/16.000
- canonical/rockwell automation 1766-l32awaa series a
- version/rockwell automation 1766-l32awaa series a/16.000
- canonical/rockwell automation 1766-l32awaa series b
- version/rockwell automation 1766-l32awaa series b/16.000
- canonical/rockwell automation 1766-l32bwa series a
- version/rockwell automation 1766-l32bwa series a/16.000
- canonical/rockwell automation 1766-l32bwa series b
- version/rockwell automation 1766-l32bwa series b/16.000
- canonical/rockwell automation 1766-l32bwaa series a
- version/rockwell automation 1766-l32bwaa series a/16.000
- canonical/rockwell automation 1766-l32bxb series a
- version/rockwell automation 1766-l32bxb series a/16.000
- canonical/rockwell automation 1766-l32bxb series b
- version/rockwell automation 1766-l32bxb series b/16.000
- canonical/rockwell automation 1766-l32bxba series a
- version/rockwell automation 1766-l32bxba series a/16.000
- canonical/rockwell automation 1766-l32bxba series b
- version/rockwell automation 1766-l32bxba series b/16.000
- version/rockwell automation micrologix/1400