6.8
MEDIUM
CVE-2021-21303
Apache Helm Sanitization Flaw
Description

Helm is open-source software which is essentially "The Kubernetes Package Manager". Helm is a tool for managing Charts. Charts are packages of pre-configured Kubernetes resources. In Helm from version 3.0 and before version 3.5.2, there a few cases where data loaded from potentially untrusted sources was not properly sanitized. When a SemVer in the `version` field of a chart is invalid, in some cases Helm allows the string to be used "as is" without sanitizing. Helm fails to properly sanitized some fields present on Helm repository `index.yaml` files. Helm does not properly sanitized some fields in the `plugin.yaml` file for plugins In some cases, Helm does not properly sanitize the fields in the `Chart.yaml` file. By exploiting these attack vectors, core maintainers were able to send deceptive information to a terminal screen running the `helm` command, as well as obscure or alter information on the screen. In some cases, we could send codes that terminals used to execute higher-order logic, like clearing a terminal screen. Further, during evaluation, the Helm maintainers discovered a few other fields that were not properly sanitized when read out of repository index files. This fix remedies all such cases, and once again enforces SemVer2 policies on version fields. All users of the Helm 3 should upgrade to the fixed version 3.5.2 or later. Those who use Helm as a library should verify that they either sanitize this data on their own, or use the proper Helm API calls to sanitize the data.

INFO

Published Date :

Feb. 5, 2021, 10:15 p.m.

Last Modified :

March 13, 2023, 5:26 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

4.0

Exploitability Score :

2.3
Affected Products

The following products are affected by CVE-2021-21303 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 Helm helm
: Total Affected Vendor : 1 | Products : 1
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-2021-21303.

URL Resource
https://github.com/helm/helm/commit/6ce9ba60b73013857e2e7c73d3f86ed70bc1ac9a Patch Third Party Advisory
https://github.com/helm/helm/releases/tag/v3.5.2 Release Notes Third Party Advisory
https://github.com/helm/helm/security/advisories/GHSA-c38g-469g-cmgx 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-2021-21303 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-21303 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
  • Reanalysis by [email protected]

    Mar. 13, 2023

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Removed CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:N)
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:N/I:P/A:N)
    Removed CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
  • Reanalysis by [email protected]

    Oct. 25, 2022

    Action Type Old Value New Value
    Removed CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
  • Initial Analysis by [email protected]

    Feb. 11, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
    Changed Reference Type https://github.com/helm/helm/commit/6ce9ba60b73013857e2e7c73d3f86ed70bc1ac9a No Types Assigned https://github.com/helm/helm/commit/6ce9ba60b73013857e2e7c73d3f86ed70bc1ac9a Patch, Third Party Advisory
    Changed Reference Type https://github.com/helm/helm/releases/tag/v3.5.2 No Types Assigned https://github.com/helm/helm/releases/tag/v3.5.2 Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/helm/helm/security/advisories/GHSA-c38g-469g-cmgx No Types Assigned https://github.com/helm/helm/security/advisories/GHSA-c38g-469g-cmgx Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:helm:helm:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.5.2
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.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-21303 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-2021-21303 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-6: Argument Injection Argument Injection CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-34: HTTP Response Splitting HTTP Response Splitting CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-83: XPath Injection XPath Injection CAPEC-84: XQuery Injection XQuery Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-105: HTTP Request Splitting HTTP Request Splitting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-250: XML Injection XML Injection CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-273: HTTP Response Smuggling HTTP Response Smuggling
Exploit Prediction

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

0.06 }} -0.02%

score

0.21514

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
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