VDB-137828 · CVE-2018-7838 · GCVE-0-2018-7838

Modicon M580 CPU BMEP582040/Ethernet Module BMENOC0301 FTP Service CWD Command memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in Modicon M580 CPU BMEP582040 and Ethernet Module BMENOC0301. This impacts an unknown function of the component FTP Service. Such manipulation as part of CWD Command leads to memory corruption. This vulnerability is listed as CVE-2018-7838. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Modicon M580 CPU BMEP582040 and Ethernet Module BMENOC0301 (SCADA Software) (unknown version). Affected by this issue is an unknown code block of the component FTP Service. The manipulation as part of a CWD Command leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. CVE summarizes:

A CWE-119 Buffer Errors vulnerability exists in Modicon M580 CPU - BMEP582040, all versions before V2.90, and Modicon Ethernet Module BMENOC0301, all versions before V2.16, which could cause denial of service on the FTP service of the controller or the Ethernet BMENOC module when it receives a FTP CWD command with a data length greater than 1020 bytes. A power cycle is then needed to reactivate the FTP service.

The bug was discovered 05/16/2019. The weakness was presented 07/15/2019. This vulnerability is handled as CVE-2018-7838 since 03/08/2018. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 60 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

SCADA Software

Vendor

Modicon

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

03/08/2018 🔍
05/16/2019 +434 days 🔍
07/15/2019 +60 days 🔍
07/16/2019 +1 days 🔍
10/26/2023 +1563 days 🔍

Sourcesinfo

Advisory: schneider-electric.com
Status: Not defined

CVE: CVE-2018-7838 (🔍)
GCVE (CVE): GCVE-0-2018-7838
GCVE (VulDB): GCVE-100-137828
OSVDB: - Schneider Electric Modicon Controllers information disclosure

Entryinfo

Created: 07/16/2019 09:25
Updated: 10/26/2023 12:02
Changes: 07/16/2019 09:25 (39), 07/04/2020 18:32 (18), 10/26/2023 12:02 (4)
Complete: 🔍
Cache ID: 216::103