An Empirical Study of the Use of Integrity Verification Mechanisms for Web Subresources

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Ressource 1Download: Chapuis20WWW.pdf (3041.47 [Ko])
State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_641044F40080
Type
Inproceedings: an article in a conference proceedings.
Collection
Publications
Institution
Title
An Empirical Study of the Use of Integrity Verification Mechanisms for Web Subresources
Title of the conference
Proceedings of the Web Conference (WWW)
Author(s)
Chapuis Bertil, Omolola Olamide, Cherubini Mauro, Humbert Mathias, Huguenin Kévin
Publisher
ACM
Address
Taipei, Taiwan
Publication state
Published
Issued date
04/2020
Peer-reviewed
Oui
Pages
34-45
Language
english
Abstract
Web developers can (and do) include subresources such as scripts, stylesheets and images in their webpages. Such subresources might be stored on remote servers such as content delivery networks (CDNs). This practice creates security and privacy risks, should a subresource be corrupted, as was recently the case for the British Airways websites. The subresource integrity (SRI) recommendation, released in mid-2016 by the W3C, enables developers to include digests in their webpages in order for web browsers to verify the integrity of subresources before loading them. In this paper, we conduct the first large-scale longitudinal study of the use of SRI on the Web by analyzing massive crawls (3B unique URLs) of the Web over the last 3.5 years. Our results show that the adoption of SRI is modest (3.40%), but grows at an increasing rate and is highly influenced by the practices of popular library developers (e.g., Bootstrap) and CDN operators (e.g., jsDelivr). We complement our analysis about SRI with a survey of web developers (N =227): It shows that a substantial proportion of developers know SRI and understand its basic functioning, but most of them ignore important aspects of the specication, such as the case of malformed digests. The results of the survey also show that the integration of SRI by developers is mostly manual-hence not scalable and error prone. This calls for a better integration of SRI in build tools.
Keywords
web security, subresource integrity, common crawl
Open Access
Yes
Funding(s)
Hasler Foundation / 19024
Create date
27/04/2020 19:07
Last modification date
03/02/2021 7:24
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