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Cellular networks that offer ubiquitous connectivity have been the major medium for delivering emergency services. In the U.S., mobile users can dial an emergency call with 911 for emergency uses in cellular networks, and the call can be forwarded to public safety answer points (PSAPs), which deal with emergency service requests. According to regulatory authority requirements for the cellular emergency services, anonymous user equipment (UE), which does not have a SIM (Subscriber Identity Module) card or a valid mobile subscription, is allowed to access them. Such support of emergency services for anonymous UEs requires different operations from conventional cellular services, and can therefore increase the attack surface of the cellular infrastructure. In this work, we are thus motivated to study the insecurity of the cellular emergency services and then discover four security vulnerabilities from them. Threateningly, they can be exploited to launch not only free data service attacks against cellular carriers, but also data DoS/overcharge and denial of cellular emergency service (DoCES) attacks against mobile users. All vulnerabilities and attacks have been validated experimentally as practical security issues in the networks of three major U.S. carriers. We finally propose and prototype standard-compliant remedies to mitigate the vulnerabilities.
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Communicating Next-Generation 911 with local 911 professionals: Preliminary recommendations
Next-Generation 911 (NG911) infrastructure will replace analog systems designed to support voice services for landline 911 callers with digital, IP-based systems that will allow smartphone users to “call” 911 via voice, text, image, and streaming video. This brief paper reports findings from a workshop conducted at the 2019 911 Early Adopters’ Summit, during which local 911 professionals from across the United States reflected on strengths, weaknesses, opportunities, and threats associated with the adoption of NG911 infrastructure and, in particular, multimedia 911 services. Workshop participants pointed to long-standing issues NG911 stands to exacerbate, including high non-emergency call volumes, poor staff retention, and inadequate psychological support which the influx of multimedia 911 calls, including those with graphic imagery, may worsen. At the same time, participants looked to local, existing resources to mitigate these issues and exploit new opportunities afforded through NG911 infrastructure. Using these findings, preliminary recommendations are offered to improve information resources available to local 911 professionals adopting NG911 systems for effective and efficient multimedia 911 services.
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- Award ID(s):
- 1951917
- PAR ID:
- 10281186
- Date Published:
- Journal Name:
- 2020 IEEE International Professional Communication Conference (ProComm
- Page Range / eLocation ID:
- 110 to 114
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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- Free Publicly Accessible Full Text
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Accepted Manuscript1.0
- Conference Paper:
- https://doi.org/10.1109/ProComm48883.2020.00023
