8.2
HIGH
CVE-2021-32803
Tar Node Arbitrary File Creation Overwrite Vulnerability
Description

The npm package "tar" (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. `node-tar` aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary `stat` calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the `node-tar` directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where `node-tar` checks for symlinks occur. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass `node-tar` symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2.

INFO

Published Date :

Aug. 3, 2021, 7:15 p.m.

Last Modified :

Nov. 21, 2024, 6:07 a.m.

Remotely Exploitable :

No

Impact Score :

5.8

Exploitability Score :

1.8
Public PoC/Exploit Available at Github

CVE-2021-32803 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2021-32803 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Siemens sinec_infrastructure_network_services
1 Oracle graalvm
1 Tar_project tar
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-32803.

URL Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch Third Party Advisory
https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20 Patch Third Party Advisory
https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw Mitigation Third Party Advisory
https://www.npmjs.com/advisories/1771 Mitigation Third Party Advisory
https://www.npmjs.com/package/tar Product Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html Patch Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch Third Party Advisory
https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20 Patch Third Party Advisory
https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw Mitigation Third Party Advisory
https://www.npmjs.com/advisories/1771 Mitigation Third Party Advisory
https://www.npmjs.com/package/tar Product Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

A centralized repository of standalone security patches for open source libraries.

appsec backport cve devsecops fix hotfix open-source patch protection remediation seal security update upgrade vulnerability

Updated: 5 months, 3 weeks ago
182 stars 0 fork 0 watcher
Born at : July 30, 2023, 4:46 p.m. This repo has been linked 265 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-32803 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-32803 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
    Added Reference https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20
    Added Reference https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw
    Added Reference https://www.npmjs.com/advisories/1771
    Added Reference https://www.npmjs.com/package/tar
    Added Reference https://www.oracle.com/security-alerts/cpuoct2021.html
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Jul. 02, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-22
    Added CWE NIST CWE-59
  • Modified Analysis by [email protected]

    Apr. 25, 2022

    Action Type Old Value New Value
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:siemens:sinec_infrastructure_network_services:*:*:*:*:*:*:*:* versions up to (excluding) 1.0.1.1
  • CVE Modified by [email protected]

    Mar. 10, 2022

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf [No Types Assigned]
  • Modified Analysis by [email protected]

    Dec. 10, 2021

    Action Type Old Value New Value
    Changed Reference Type https://www.oracle.com/security-alerts/cpuoct2021.html No Types Assigned https://www.oracle.com/security-alerts/cpuoct2021.html Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:oracle:graalvm:20.3.3:*:*:*:enterprise:*:*:* *cpe:2.3:a:oracle:graalvm:21.2.0:*:*:*:enterprise:*:*:*
  • CVE Modified by [email protected]

    Oct. 20, 2021

    Action Type Old Value New Value
    Added Reference https://www.oracle.com/security-alerts/cpuoct2021.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Aug. 12, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
    Changed Reference Type https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20 No Types Assigned https://github.com/npm/node-tar/commit/9dbdeb6df8e9dbd96fa9e84341b9d74734be6c20 Patch, Third Party Advisory
    Changed Reference Type https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw No Types Assigned https://github.com/npm/node-tar/security/advisories/GHSA-r628-mhmh-qjhw Mitigation, Third Party Advisory
    Changed Reference Type https://www.npmjs.com/advisories/1771 No Types Assigned https://www.npmjs.com/advisories/1771 Mitigation, Third Party Advisory
    Changed Reference Type https://www.npmjs.com/package/tar No Types Assigned https://www.npmjs.com/package/tar Product, Third Party Advisory
    Added CWE NIST CWE-22
    Added CPE Configuration OR *cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* versions up to (excluding) 3.2.3 *cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* versions from (including) 4.0.0 up to (excluding) 4.4.15 *cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* versions from (including) 5.0.0 up to (excluding) 5.0.7 *cpe:2.3:a:tar_project:tar:*:*:*:*:*:node.js:*:* versions from (including) 6.0.0 up to (excluding) 6.1.2
  • CVE Modified by [email protected]

    Aug. 03, 2021

    Action Type Old Value New Value
    Changed Description The npm package "tar" (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. `node-tar` aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary `stat` calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the `node-tar` directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where `node-tar` checks for symlinks occur. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass `node-tar` symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2. The npm package "tar" (aka node-tar) before versions 6.1.2, 5.0.7, 4.4.15, and 3.2.3 has an arbitrary File Creation/Overwrite vulnerability via insufficient symlink protection. `node-tar` aims to guarantee that any file whose location would be modified by a symbolic link is not extracted. This is, in part, achieved by ensuring that extracted directories are not symlinks. Additionally, in order to prevent unnecessary `stat` calls to determine whether a given path is a directory, paths are cached when directories are created. This logic was insufficient when extracting tar files that contained both a directory and a symlink with the same name as the directory. This order of operations resulted in the directory being created and added to the `node-tar` directory cache. When a directory is present in the directory cache, subsequent calls to mkdir for that directory are skipped. However, this is also where `node-tar` checks for symlinks occur. By first creating a directory, and then replacing that directory with a symlink, it was thus possible to bypass `node-tar` symlink checks on directories, essentially allowing an untrusted tar file to symlink into an arbitrary location and subsequently extracting arbitrary files into that location, thus allowing arbitrary file creation and overwrite. This issue was addressed in releases 3.2.3, 4.4.15, 5.0.7 and 6.1.2.
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.69 }} 0.07%

score

0.79874

percentile

CVSS31 - Vulnerability Scoring System
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