CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
EPSS
Percentile
94.5%
ICS-CERT has received a report from Siemens regarding a buffer overflow vulnerability in the web interface of the Scalance X Industrial Ethernet switch. This vulnerability was reported to Siemens by Jürgen Bilberger from Daimler TSS GmbH.
This vulnerability leaves the affected devices susceptible to a remote denial of service attack. Siemens has published a firmware update that addresses this vulnerability.
The following Scalance X products affected by this vulnerability:
Successful exploitation of the reported vulnerability allows an attacker to perform malicious actions which may lead to a denial of service condition or possible arbitrary code execution. These actions may ultimately impact the process environment in which the system is deployed.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Scalance X Industrial Ethernet switches are industrial grade Ethernet switches used to connect industrial components. This product line provides a web interface to manage controller configuration. Scalance X is used in the Agriculture and Food, Critical Manufacturing, Government Facilities, Dams, Transportation Systems, Water, Chemical, Defense Industrial Base, Energy, and Communications sectors.
The embedded web server does not properly sanitize URLs in HTTP requests. If an attacker requests a malformed URL from the web server, a vulnerable Scalance X switch reboots, inhibits further data transmission to the switch, and may allow arbitrary code execution.
CVE-2012-1802 has been assigned to this vulnerability. Siemens has assigned a CVSS V2 base score of 7.8.
This vulnerability is remotely exploitable.
No known exploits specifically target this vulnerability.
An attacker with a moderate skill level would be able to exploit these vulnerabilities.
Siemens has produced firmware updates that resolve this vulnerability for the listed hardware platforms. Siemens strongly recommends installing the updates as soon as possible. Download the appropriate update from the following links:
The Siemens Security Advisory is available at <http://www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-130874.pdf>.
In addition to applying the update provided by Siemens, ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
The Control Systems Security Program (CSSP) also provides a section for control systems security recommended practices on the CSSP web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
support.automation.siemens.com/WW/view/en/59613294
support.automation.siemens.com/WW/view/en/59868786
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-1802
www.industry.siemens.com/topics/global/en/industrial-security/Documents/operational_guidelines_industrial_security_en.pdf
www.siemens.com/cert
www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-130874.pdf
www.siemens.com/industrialsecurity
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-12-102-04
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20Scalance%20X%20Buffer%20Overflow%20Vulnerability+https://www.cisa.gov/news-events/ics-advisories/icsa-12-102-04
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-12-102-04&title=Siemens%20Scalance%20X%20Buffer%20Overflow%20Vulnerability
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-12-102-04
www.oig.dhs.gov/
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20Scalance%20X%20Buffer%20Overflow%20Vulnerability&body=www.cisa.gov/news-events/ics-advisories/icsa-12-102-04