VDB-115669 · CVE-2018-8836 · BID 103726

WAGO 750 PLC up to 10 TCP Handshake Crafted Packet denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in WAGO 750 PLC up to 10. This issue affects some unknown processing of the component TCP Handshake Handler. This manipulation as part of Crafted Packet causes denial of service. The identification of this vulnerability is CVE-2018-8836. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability classified as problematic was found in WAGO 750 PLC up to 10. Affected by this vulnerability is an unknown functionality of the component TCP Handshake Handler. The manipulation as part of a Crafted Packet leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

Wago 750 Series PLCs with firmware version 10 and prior include a remote attack may take advantage of an improper implementation of the 3 way handshake during a TCP connection affecting the communications with commission and service tools. Specially crafted packets may also be sent to Port 2455/TCP/IP, used in Codesys management software, which may result in a denial-of-service condition of communications with commissioning and service tools.

The bug was discovered 03/29/2018. The weakness was shared 04/03/2018 (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2018-8836 since 03/20/2018. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 5 days. During that time the estimated underground price was around $0-$5k.

Proper firewalling of tcp/2455 is able to address this issue.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 103726†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Firewalling: 🔍

Timelineinfo

03/20/2018 🔍
03/29/2018 +9 days 🔍
03/29/2018 +0 days 🔍
04/03/2018 +5 days 🔍
04/03/2018 +0 days 🔍
04/04/2018 +1 days 🔍
02/08/2021 +1041 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Researcher: Younes Dragoni
Status: Not defined

CVE: CVE-2018-8836 (🔍)
GCVE (CVE): GCVE-0-2018-8836
GCVE (VulDB): GCVE-100-115669
SecurityFocus: 103726 - Multiple WAGO Products CVE-2018-8836 Denial of Service Vulnerability

Entryinfo

Created: 04/04/2018 08:27
Updated: 02/08/2021 11:59
Changes: 04/04/2018 08:27 (61), 01/21/2020 09:23 (3), 02/08/2021 11:59 (2)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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