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GHSA-3jfq-g458-7qm9
No affected components available
Impact
Arbitrary File Creation, Arbitrary File Overwrite, Arbitrary Code Execution
node-tar aims to prevent extraction of absolute file paths by turning absolute paths into relative paths when the preservePaths flag is not set to true. This is achieved by stripping the absolute path root from any absolute file paths contained in a tar file. For example /home/user/.bashrc would turn into home/user/.bashrc.
This logic was insufficient when file paths contained repeated path roots such as ////home/user/.bashrc. node-tar would only strip a single path root from such paths. When given an absolute file path with repeating path roots, the resulting path (e.g. ///home/user/.bashrc) would still resolve to an absolute path, thus allowing arbitrary file creation and overwrite.
Patches
3.2.2 || 4.4.14 || 5.0.6 || 6.1.1
NOTE: an adjacent issue CVE-2021-32803 affects this release level. Please ensure you update to the latest patch levels that address CVE-2021-32803 as well if this adjacent issue affects your node-tar use case.
Workarounds
Users may work around this vulnerability without upgrading by creating a custom onentry method which sanitizes the entry.path or a filter method which removes entries with absolute paths.
const path = require('path')
const tar = require('tar')
tar.x({
file: 'archive.tgz',
// either add this function...
onentry: (entry) => {
if (path.isAbsolute(entry.path)) {
entry.path = sanitizeAbsolutePathSomehow(entry.path)
entry.absolute = path.resolve(entry.path)
}
},
// or this one
filter: (file, entry) => {
if (path.isAbsolute(entry.path)) {
return false
} else {
return true
}
}
})
Users are encouraged to upgrade to the latest patch versions, rather than attempt to sanitize tar input themselves.
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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