[HIGH] Arbitrary File Overwrite -- need a fix by May 10, 2019

[rjayasekera]

https://app.snyk.io/vuln/SNYK-JS-TAR-174125

Overview
tar is a full-featured Tar for Node.js.

Affected versions of this package are vulnerable to Arbitrary File Overwrite. Extracting tarballs containing a hard-link to a file that already exists in the system, and a file that matches the hard-link may overwrite system's files with the contents of the extracted file.

Detailed paths and remediation
Introduced through: [email protected] › [email protected] › [email protected] › [email protected] › [email protected] › [email protected]
Remediation: No remediation path available.
Introduced through: [email protected] › [email protected] › [email protected] › [email protected] › [email protected] › [email protected]
Remediation: No remediation path available.
Introduced through: [email protected] › [email protected] › [email protected] › [email protected] › [email protected]
Remediation: No remediation path available.
Introduced through: [email protected] › [email protected] › [email protected] › [email protected]
Remediation: No remediation path available.

Remediation
Upgrade tar to version 4.4.2 or higher.

[rfultz]

The five vulnerabilities (listed below) all stem from the version of tar that node-gyp is using.
npm > libcipm > npm-lifecycle > node-gyp > tar
npm > libnpm > npm-lifecycle > node-gyp > tar
npm > node-gyp > tar
npm > npm-lifecycle > node-gyp > tar
gulp-sass > node-sass > node-gyp > tar

There's a fix coming soon with this PR. I've watched the conversation and will check each day, just in case.

[rfultz]

node-gyp 1713 has been merged into their codebase but only addresses node-gyp 4+. We're using 3.8.0, which is being addressed with their 1718. I'm keeping an eye on it.

[rfultz]

Update: Recent conversation is about how to handle the version number (the change would be a breaking change for some so it should be a major version change, but some want to leave the number the same, which would require manual updates for everyone who's already using the current version).

[rfultz]

This item has been added to the agenda of the next Node.js Technical Steering Committee. Seems like some confusion over who 'owns' node-gyp and the few people who can publish it to npm have gone inactive. The next TSC meeting is Wednesday, 24 April.

[rfultz]

Continuing discussion on the boards. Seems like there's some movement but there are those who aren't convinced this issue's (disputed) severity is worth dropping support for older versions of Node.

[rfultz]

There's some push-back that the fix shouldn't be inside node-gyp itself but inside node-tar. There's a new issue: isaacs/node-tar#212

[rfultz]

The only progress is that the 1718 ticket has been closed and now the work is back with node-tar (as it should be). The node-tar team isn't interested in supporting such outdated versions of Node (<1.0) but is open to others doing that work and submitting PRs. We're using the latest Node (10.15.1) so aren't affected by that conversation apart from it's still a conversation rather than a decision or progress.

The 212 link above is still the most recent.

[rfultz]

The advisory explains "Extracting tarballs containing a hardlink to a file that already exists in the system, and a file that matches the hardlink will overwrite the system's file with the contents of the extracted file."

The offending code is inside the node-tar package pre-4.4.2.
node-tar is at 4.4.8. 4.4.2 was released on 30 April 2018.
releases

node-gyp currently requires tar < 4.4.2.
They've updated their code but it's still working its way to production.
issue

node-sass uses node-gyp
Updating node-gyp could be a breaking change for them so they're getting their strategy together.
issue

gulp-sass uses node-sass
They're waiting for node-sass to do their thing.
issue

npm-lifecycle uses node-gyp
Could be updated when node-gyp releases their fix.
issue

libnpm uses npm-lifecycle
repo

libcipm uses npm-lifecyce
repo

npm uses npm-lifecycle, node-gyp, libnpm, and libcipm
repo

[AmyKort]

Is this blocked?

[rfultz]

Yeah, we're waiting on updates from the node-sass team. It's not much of a risk for us so it's a lower priority; I'm keeping an eye on it. There was a release yesterday but we're still not seeing it.

[dorothyyeager]

Still waiting on others.

[dorothyyeager]

Moving to 9.4; PR needs review.