Two vulnerabilities in Siemens SIMATIC WinCC



Published: 2014-12-19
Risk Critical
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2014-8551
CVE-2014-8552
CWE-ID CWE-20
CWE-200
Exploitation vector Network
Public exploit Vulnerability #1 is being exploited in the wild.
Vulnerable software
Subscribe 		Siemens SIMATIC WinCC
Server applications / SCADA systems

SIMATIC PCS 7
Server applications / SCADA systems

Vendor Siemens

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU6190

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2014-8551

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to improper input validation when processing packets sent to the WinCC server. A remote unauthenticated attacker can send a specially crafted packet and execute arbitrary code on the target system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Note: this vulnerability has been exploited in targeted attacks.

Mitigation

Install updates from vendor's website:

TIA Portal V13 (including WinCC Professional Runtime)

WinCC 7.0

WinCC V7.0 SP3

WinCC 7.2

WinCC 7.3

PCS 7 V7.1 SP4

PCS 7 V8.0 SP2

PCS 7 V8.1

Vulnerable software versions

Siemens SIMATIC WinCC: 7.0 - 7.3 Update 1

SIMATIC PCS 7: 7.1 - 8.1

External links

http://ics-cert.us-cert.gov/advisories/ICSA-14-329-02D
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-134508.pdf


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker 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?

Yes. This vulnerability is being exploited in the wild.

2) Information disclosure

EUVDB-ID: #VU6191

Risk: Medium

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2014-8552

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to view arbitrary files on the system.

The vulnerability exists due to improper input validation when processing packets sent to the WinCC server. A remote unauthenticated attacker can send a specially crafted packet and view contents of arbitrary files on the target system.

Successful exploitation of the vulnerability may allow an attacker to gain access to potentially sensitive information.

Mitigation

Install updates from vendor's website:

TIA Portal V13 (including WinCC Professional Runtime)

WinCC 7.0

WinCC V7.0 SP3

WinCC 7.2

WinCC 7.3

PCS 7 V7.1 SP4

PCS 7 V8.0 SP2

PCS 7 V8.1

Vulnerable software versions

Siemens SIMATIC WinCC: 7.0 - 7.3 Update 1

SIMATIC PCS 7: 7.1 - 8.1

External links

http://ics-cert.us-cert.gov/advisories/ICSA-14-329-02D
http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-134508.pdf


Q & A

Can this vulnerability be exploited remotely?

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



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