CVE-2021-39134
"Arborist File System Exfiltration via Case-Insensitive Symlink Dependency"
Description
`@npmcli/arborist`, the library that calculates dependency trees and manages the `node_modules` folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is, in part, accomplished by resolving dependency specifiers defined in `package.json` manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies. When multiple dependencies differ only in the case of their name, Arborist's internal data structure saw them as separate items that could coexist within the same level in the `node_modules` hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as `file:/some/path`, this allowed an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem. For example, a package `pwn-a` could define a dependency in their `package.json` file such as `"foo": "file:/some/path"`. Another package, `pwn-b` could define a dependency such as `FOO: "file:foo.tgz"`. On case-insensitive file systems, if `pwn-a` was installed, and then `pwn-b` was installed afterwards, the contents of `foo.tgz` would be written to `/some/path`, and any existing contents of `/some/path` would be removed. Anyone using npm v7.20.6 or earlier on a case-insensitive filesystem is potentially affected. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above.
INFO
Published Date :
Aug. 31, 2021, 5:15 p.m.
Last Modified :
Nov. 7, 2023, 3:37 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
5.8
Exploitability Score :
1.8
Affected Products
The following products are affected by CVE-2021-39134
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.
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-2021-39134
.
URL | Resource |
---|---|
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf | Patch Third Party Advisory |
https://github.com/npm/arborist/security/advisories/GHSA-2h3h-q99f-3fhc | Mitigation Third Party Advisory |
https://www.npmjs.com/package/%40npmcli/arborist | |
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-39134
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-39134
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 [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://www.npmjs.com/package/%40npmcli/arborist [No types assigned] Removed Reference GitHub, Inc. https://www.npmjs.com/package/@npmcli/arborist -
Reanalysis by [email protected]
Aug. 12, 2022
Action Type Old Value New Value Removed CWE NIST CWE-59 Added CWE NIST CWE-178 -
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 Changed Reference Type https://github.com/npm/arborist/security/advisories/GHSA-2h3h-q99f-3fhc Third Party Advisory https://github.com/npm/arborist/security/advisories/GHSA-2h3h-q99f-3fhc Mitigation, 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. 03, 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]
Sep. 09, 2021
Action Type Old Value New Value Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism Added CVSS V2 NIST (AV:L/AC:M/Au:N/C:P/I:P/A:P) Added CVSS V3.1 NIST AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Changed Reference Type https://github.com/npm/arborist/security/advisories/GHSA-2h3h-q99f-3fhc No Types Assigned https://github.com/npm/arborist/security/advisories/GHSA-2h3h-q99f-3fhc Third Party Advisory Changed Reference Type https://www.npmjs.com/package/@npmcli/arborist No Types Assigned https://www.npmjs.com/package/@npmcli/arborist Product, Third Party Advisory Added CWE NIST CWE-59 Added CPE Configuration AND OR *cpe:2.3:a:npmjs:arborist:*:*:*:*:*:node.js:*:* versions up to (excluding) 2.8.2 OR cpe:2.3:a:npmjs:npm:*:*:*:*:*:*:*:* versions up to (excluding) 7.20.7 -
CVE Modified by [email protected]
Aug. 31, 2021
Action Type Old Value New Value Changed Description `@npmcli/arborist`, the library that calculates dependency trees and manages the `node_modules` folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is, in part, accomplished by resolving dependency specifiers defined in `package.json` manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies. When multiple dependencies differ only in the case of their name, Arborist's internal data structure saw them as separate items that could coexist within the same level in the `node_modules` hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as `file:/some/path`, this allowed an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem. For example, a package `pwn-a` could define a dependency in their `package.json` file such as `"foo": "file:/some/path"`. Another package, `pwn-b` could define a dependency such as `FOO: "file:foo.tgz"`. On case-insensitive file systems, if `pwn-a` was installed, and then `pwn-b` was installed afterwards, the contents of `foo.tgz` would be written to `/some/path`, and any existing contents of `/some/path` would be removed. Anyone using npm v7.20.6 or earlier on a case-insensitive filesystem is potentially affected. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above. `@npmcli/arborist`, the library that calculates dependency trees and manages the `node_modules` folder hierarchy for the npm command line interface, aims to guarantee that package dependency contracts will be met, and the extraction of package contents will always be performed into the expected folder. This is, in part, accomplished by resolving dependency specifiers defined in `package.json` manifests for dependencies with a specific name, and nesting folders to resolve conflicting dependencies. When multiple dependencies differ only in the case of their name, Arborist's internal data structure saw them as separate items that could coexist within the same level in the `node_modules` hierarchy. However, on case-insensitive file systems (such as macOS and Windows), this is not the case. Combined with a symlink dependency such as `file:/some/path`, this allowed an attacker to create a situation in which arbitrary contents could be written to any location on the filesystem. For example, a package `pwn-a` could define a dependency in their `package.json` file such as `"foo": "file:/some/path"`. Another package, `pwn-b` could define a dependency such as `FOO: "file:foo.tgz"`. On case-insensitive file systems, if `pwn-a` was installed, and then `pwn-b` was installed afterwards, the contents of `foo.tgz` would be written to `/some/path`, and any existing contents of `/some/path` would be removed. Anyone using npm v7.20.6 or earlier on a case-insensitive filesystem is potentially affected. This is patched in @npmcli/arborist 2.8.2 which is included in npm v7.20.7 and above.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-39134
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-39134
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.01%
score
0.28032
percentile