VDB-123387 · CVE-2018-7791 · BID 105182

Schneider Electric Modicon M221 up to 1.6.1 Password Change access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Schneider Electric Modicon M221 up to 1.6.1. It has been classified as critical. Affected by this vulnerability is an unknown functionality of the component Password Change Handler. Performing a manipulation results in access control. This vulnerability is reported as CVE-2018-7791. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Schneider Electric Modicon M221 up to 1.6.1 (SCADA Software). It has been classified as critical. This affects an unknown code block of the component Password Change Handler. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A Permissions, Privileges, and Access Control vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to overwrite the original password with their password. If an attacker exploits this vulnerability and overwrite the password, the attacker can upload the original program from the PLC.

The bug was discovered 08/28/2018. The weakness was disclosed 08/29/2018 (Website). It is possible to read the advisory at schneider-electric.com. This vulnerability is uniquely identified as CVE-2018-7791 since 03/07/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 1.6.2.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 105182†). The entries VDB-123386 and VDB-123388 are pretty similar. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.0
VulDB Meta Temp Score: 8.9

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

ADP CISA Base Score: 9.8
ADP CISA 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: Access control
CWE: CWE-264
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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Modicon M221 1.6.2.0

Timelineinfo

03/07/2018 🔍
08/28/2018 +173 days 🔍
08/28/2018 +0 days 🔍
08/29/2018 +0 days 🔍
08/29/2018 +0 days 🔍
08/30/2018 +1 days 🔍
05/29/2026 +2829 days 🔍

Sourcesinfo

Vendor: schneider-electric.com

Advisory: schneider-electric.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-7791 (🔍)
GCVE (CVE): GCVE-0-2018-7791
GCVE (VulDB): GCVE-100-123387
SecurityFocus: 105182 - Schneider Electric Modicon M221 Multiple Security Bypass Vulnerabilities

See also: 🔍

Entryinfo

Created: 08/30/2018 08:22
Updated: 05/29/2026 21:38
Changes: 08/30/2018 08:22 (63), 03/19/2020 11:08 (4), 05/29/2026 21:38 (29)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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