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Moxa EDS-G516E and EDS-510E Series Ethernet Switches

Moxa EDS-G516E and EDS-510E Series Ethernet Switches

1. EXECUTIVE SUMMARY

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could crash the device, execute arbitrary code, and allow access to sensitive information.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Moxa reports the vulnerabilities affect the following Ethernet switches:

3.2 VULNERABILITY OVERVIEW

3.2.1    STACK-BASED BUFFER OVERFLOW CWE-121

The attacker may execute arbitrary codes or target the device, causing it to go out of service.

CVE-2020-7007 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.2    USE OF A BROKEN OR RISKY CRYPTOGRAPHIC ALGORITHM CWE-327

The affected products use a weak cryptographic algorithm, which may allow confidential information to be disclosed.

CVE-2020-7001 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

3.2.3    USE OF HARD-CODED CRYPTOGRAPHIC KEY CWE-321

The affected products use a hard-coded cryptographic key, increasing the possibility that confidential data can be recovered.

CVE-2020-6979 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.4    USE OF HARD-CODED CREDENTIALS CWE-798

An attacker may gain access to the system without proper authentication.

CVE-2020-6981 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.2.5    CLASSIC BUFFER OVERFLOW CWE-120

Some of the parameters in the setting pages do not ensure text is the correct size for its buffer.

CVE-2020-6989 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

3.2.6    CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319

Sensitive information is transmitted over some web applications in cleartext.

CVE-2020-6997 has been assigned to this vulnerability. A CVSS v3 base score of 4.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N).

3.2.7    WEAK PASSWORD REQUIREMENTS CWE-521

Weak password requirements may allow an attacker to gain access using brute force.

CVE-2020-6991 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

3.4 RESEARCHER

Ilya Karpov and Evgeniy Druzhinin from Rostelecom-Solar and Georgy Zaytsev of Positive Technologies reported these vulnerabilities to Moxa.

4. MITIGATIONS

Moxa has developed the following solutions to address the vulnerabilities:

Please see Moxa’s security advisory for more information.

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.

Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.

CISA also recommends users take the following measures to protect themselves from social engineering attacks: 

No known public exploits specifically target these vulnerabilities.

Source:

https://www.us-cert.gov/ics/advisories/icsa-20-056-04

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