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Fixes arbitrary file write on fetch #7831

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merged 1 commit into from Jan 31, 2020
Merged

Fixes arbitrary file write on fetch #7831

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5 changes: 5 additions & 0 deletions src/fetchers/tarball-fetcher.js
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Expand Up @@ -136,6 +136,11 @@ export default class TarballFetcher extends BaseFetcher {
chown: false, // don't chown. just leave as it is
map: header => {
header.mtime = now;
if (header.linkname) {
const basePath = path.posix.dirname(path.join('/', header.name));
const jailPath = path.posix.join(basePath, header.linkname);
header.linkname = path.posix.relative('/', jailPath);
}
return header;
},
fs: patchedFs,
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