The Security Risk of Lacking Compiler Protection in WebAssembly

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Abstract

WebAssembly is increasingly used as the compilation target for cross-platform applications.
In this paper, we investigate whether one can rely on the security measures enforced by existing C compilers when compiling C programs to WebAssembly.
We compiled 4,469 C programs with known buffer overflow vulnerabilities to x86 code and to WebAssembly, and observed the outcome of the execution of the generated code to differ for 1,088 programs.
Through manual inspection, we identified that the root cause for these is the lack of security measures such as stack canaries in the generated
WebAssembly: while x86 code crashes upon a stack-based buffer overflow,
the corresponding WebAssembly continues to be executed.
We conclude that compiling an existing C program to WebAssembly without additional precautions may hamper its security, and we encourage more research in this direction.
Original languageEnglish
Title of host publication21st IEEE International Conference on Software Quality, Reliability, and Security
PublisherIEEE
Publication statusPublished - 2021
Event21st IEEE International Conference on Software Quality, Reliability, and Security -
Duration: 6 Dec 202110 Dec 2021
Conference number: 2021
https://qrs21.techconf.org/

Conference

Conference21st IEEE International Conference on Software Quality, Reliability, and Security
Abbreviated titleQRS
Period6/12/2110/12/21
Internet address

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