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permission: fix some vulnerabilities in fs #47091

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merged 1 commit into from
Mar 19, 2023
Merged

permission: fix some vulnerabilities in fs #47091

merged 1 commit into from
Mar 19, 2023

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tniessen
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@tniessen tniessen commented Mar 14, 2023 •
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Without this patch, any restrictions imposed by the permission model can be easily bypassed, granting full read and write access to any file. On Windows, this could even be used to delete files that are supposed to be write-protected.

This likely also fixes a separate bug in fsPromises.open(), which currently incorrectly requires read permissions even for write-only access. (Unless that was somehow intentional?)

I'm not very confident in my understanding of the permission model. Please review carefully.

Fixes: #47090

@tniessen tniessen added fs Issues and PRs related to the fs subsystem / file system. security Issues and PRs related to security. labels Mar 14, 2023
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@tniessen tniessen requested a review from RafaelGSS March 14, 2023 20:44
@RafaelGSS RafaelGSS added the request-ci Add this label to start a Jenkins CI on a PR. label Mar 14, 2023
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CI: https://ci.nodejs.org/job/node-test-pull-request/50382/

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RafaelGSS reviewed Mar 14, 2023
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Good catch. I wasn't aware of write_as_side_effects. That's indeed bizarre.

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RafaelGSS approved these changes Mar 15, 2023
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LGTM.

@tniessen tniessen added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Mar 15, 2023
@RafaelGSS RafaelGSS mentioned this pull request Mar 15, 2023
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permission: fix some vulnerabilities in fs
233eb62 
Without this patch, any restrictions imposed by the permission model can
be easily bypassed, granting full read and write access to any file. On
Windows, this could even be used to delete files that are supposed to be
write-protected.

Fixes: nodejs#47090
@tniessen tniessen force-pushed the permission-fix-some-fatal-flaws-in-fs-open branch from c291faa to 233eb62 Compare March 15, 2023 19:05
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I changed the implementation to follow V8 conventions as suggested by @targos and @addaleax. The diff is in c291faa.

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Both Jenkins CI runs failed on Windows due to test-http-max-sockets, which also failed in #47108, so it seems unrelated.

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It might be good to get more eyes on this, perhaps from @nodejs/libuv since especially the behavior on Windows depends more on how libuv translates flags than on Windows itself.

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CI: https://ci.nodejs.org/job/node-test-pull-request/50454/

@tniessen tniessen added the commit-queue Add this label to land a pull request using GitHub Actions. label Mar 19, 2023
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@nodejs-github-bot nodejs-github-bot merged commit aa30e16 into nodejs:main Mar 19, 2023
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Landed in aa30e16

This was referenced Mar 20, 2023
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@RafaelGSS RafaelGSS mentioned this pull request Apr 3, 2023
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@tniessen tniessen added the permission Issues and PRs related to the Permission Model label Aug 10, 2023
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@RafaelGSS RafaelGSS RafaelGSS approved these changes

@Trott Trott Trott approved these changes

@marco-ippolito marco-ippolito marco-ippolito approved these changes

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Permission logic in fs.open(), fs.openSync(), and fsPromises.open() can easily be bypassed
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