CVE-2021-23390 Security Vulnerability & Exploit Details

CVE-2021-23390
Vulnerability Scoring

9.8

/10

Critical Risk

As a catastrophic security flaw, CVE-2021-23390 has severe implications, demanding immediate intervention.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2021-23390 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:51 UTC
Originally published on: 🕓 12 Jul 2021, 16:15 UTC

Time between publication and last update: 1227 days

CVSS Release: version 3

CVSS3 Source

report@snyk.io

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVE-2021-23390 Vulnerability Summary

CVE-2021-23390: The package total4 before 0.0.43 are vulnerable to Arbitrary Code Execution via the U.set() and U.get() functions.

Assessing the Risk of CVE-2021-23390

Access Complexity Graph

The exploitability of CVE-2021-23390 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2021-23390

With low attack complexity and no required privileges, CVE-2021-23390 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2021-23390, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2021-23390, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2021-23390 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2021-23390 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2021-23390 can disrupt system operations, potentially causing complete denial of service (DoS).

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.676% (probability of exploit)

EPSS Percentile: 80.16% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 19.840000000000003% of others.

CVE-2021-23390 References

External References

CWE Common Weakness Enumeration

CWE-94

CAPEC Common Attack Pattern Enumeration and Classification

Code Injection CAPEC-242 An adversary exploits a weakness in input validation on the target to inject new code into that which is currently executing. This differs from code inclusion in that code inclusion involves the addition or replacement of a reference to a code file, which is subsequently loaded by the target and used as part of the code of some application.
Leverage Executable Code in Non-Executable Files CAPEC-35 An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
Manipulating User-Controlled Variables CAPEC-77 This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.

Vulnerable Configurations

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cpe:2.3:a:totaljs:total4:0.0.39:*:*:*:*:node.js:*:*
cpe:2.3:a:totaljs:total4:0.0.39:*:*:*:*:node.js:*:*
cpe:2.3:a:totaljs:total4:0.0.40:*:*:*:*:node.js:*:*
cpe:2.3:a:totaljs:total4:0.0.40:*:*:*:*:node.js:*:*
cpe:2.3:a:totaljs:total4:0.0.42:*:*:*:*:node.js:*:*
cpe:2.3:a:totaljs:total4:0.0.42:*:*:*:*:node.js:*:*

Protect Your Infrastructure against CVE-2021-23390: Combat Critical CVE Threats

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CVE-2021-23390 Vulnerability Scoring