Multiple vulnerabilities in Siemens SIMATIC WinCC and SIMATIC PCS



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-40358
CVE-2021-40359
CVE-2021-40364
CWE-ID CWE-22
CWE-532
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SIMATIC PCS 7
Server applications / SCADA systems

Siemens SIMATIC WinCC
Server applications / SCADA systems

Vendor Siemens

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Path traversal

EUVDB-ID: #VU58235

Risk: Medium

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-40358

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote authenticated attacker can send a specially crafted HTTP request and read, write or delete critical files.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC PCS 7: 8.2 - 9.1

Siemens SIMATIC WinCC: 7.4 - 17

CPE2.3 External links

https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Path traversal

EUVDB-ID: #VU58236

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-40359

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences. A remote authenticated attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC PCS 7: 8.2 - 9.1

Siemens SIMATIC WinCC: 7.4 - 17

CPE2.3 External links

https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Inclusion of Sensitive Information in Log Files

EUVDB-ID: #VU58237

Risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-40364

CWE-ID: CWE-532 - Information Exposure Through Log Files

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to software stores sensitive information into log files. A local user can read the log files and gain access to sensitive data.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC PCS 7: 8.2 - 9.1

Siemens SIMATIC WinCC: 7.4 - 17

CPE2.3 External links

https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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