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Linux kernel security fixes spotted before release with side channel attack on...developer mailing lists

Submitted by Roy Schestowitz on Saturday 5th of September 2020 10:45:44 PM Filed under
Linux
Security

Boffins affiliated with BMW, Siemens, and two German universities have found that they can detect Linux kernel security fixes before they get released, insight that could allow miscreants to develop and deploy exploit code for which there's no defense.

What's more, they have found that Linux kernel patches regularly get added in a way that bypasses public review and discussion, a practice that opens at least a theoretical risk of backdoored code.

In an ArXiv-distributed paper [PDF] titled, "The Sound of Silence: Mining Security Vulnerabilities from Secret Integration Channels in Open-Source Projects," Ralf Ramsauer (University of Applied Sciences Regensburg), Lukas Bulwahn (BMW), Daniel Lohmann (University of Hanover), and Wolfgang Mauerer (University of Applied Sciences Regensburg/Siemens) outline a data mining scheme that amounts to a side channel attack on the open source vulnerability disclosure process.

They describe the patch process to address the 2018 Level 1 Terminal Fault (L1TF) vulnerability, a side channel speculative execution attack that allowed data to be obtained from virtual machines on Intel-based servers.

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