Denial of service vulnerabilities in Siemens SIMATIC S7



Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2018-13815
CVE-2018-16556
CVE-2018-16557
CWE-ID CWE-400
CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SIMATIC S7-1200
Hardware solutions / Firmware

SIMATIC S7-1500 CPU
Hardware solutions / Firmware

SIMATIC S7-410
Hardware solutions / Firmware

SIMATIC S7-400
Hardware solutions / Firmware

SIMATIC S7-400 PN/DP V7
Server applications / SCADA systems

SIMATIC S7-400 H
Server applications / SCADA systems

Vendor Siemens

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Resource exhaustion

EUVDB-ID: #VU15890

Risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-13815

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to resource exhaustion. A remote attacker can send packets to Port 102/TCP, exhaust the available connection pool by opening a sufficient number of connections to the device and cause the service to crash.

Mitigation

The vulnerability has been fixed in the version 2.6.

Vulnerable software versions

SIMATIC S7-1200: before 2.6

SIMATIC S7-1500 CPU: before 2.6

CPE2.3 External links

https://ics-cert.us-cert.gov/advisories/ICSA-18-317-05


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Improper input validation

EUVDB-ID: #VU15891

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16556

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when processing malicious input. A remote attacker can send specially crafted packets to Port 102/TCP via Ethernet interface, via PROFIBUS, or via multi-point interfaces (MPI) and cause the affected devices to go into defect mode.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC S7-410: All versions

SIMATIC S7-400 PN/DP V7: All versions

SIMATIC S7-400 H: All versions

SIMATIC S7-400: All versions

CPE2.3 External links

https://ics-cert.us-cert.gov/advisories/ICSA-18-317-02


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

3) Improper input validation

EUVDB-ID: #VU15892

Risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-16557

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to an error when processing malicious input. A remote attacker can send specially crafted packets to Port 102/TCP via Ethernet interface via PROFIBUS or MPI and cause the affected devices to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

SIMATIC S7-410: All versions

SIMATIC S7-400 PN/DP V7: All versions

SIMATIC S7-400 H: All versions

SIMATIC S7-400: All versions

CPE2.3 External links

https://ics-cert.us-cert.gov/advisories/ICSA-18-317-02


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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