CVE-2021-23420 Security Vulnerability & Exploit Details

CVE-2021-23420
Vulnerability Scoring

7.7

/10

Very High Risk

Highly exploitable, CVE-2021-23420 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: High
Exploits require significant effort and 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-2021-23420 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:51 UTC
Originally published on: 🕐 11 Aug 2021, 13:15 UTC

Time between publication and last update: 1197 days

CVSS Release: version 3

CVSS3 Source

report@snyk.io

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-23420 Vulnerability Summary

CVE-2021-23420: This affects the package codeception/codeception from 4.0.0 and before 4.1.22, before 3.1.3. The RunProcess class can be leveraged as a gadget to run arbitrary commands on a system that is deserializing user input without validation.

Assessing the Risk of CVE-2021-23420

Access Complexity Graph

The exploitability of CVE-2021-23420 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-2021-23420

CVE-2021-23420 presents a challenge to exploit due to its high attack complexity, but the absence of privilege requirements still makes it a viable target for skilled attackers. A thorough security review is advised.

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-2021-23420, 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-2021-23420, 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-2021-23420 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2021-23420 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: Low
CVE-2021-23420 may slightly degrade system performance without fully affecting service availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.485% (probability of exploit)

EPSS Percentile: 76.19% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 23.810000000000002% of others.

CVE-2021-23420 References

External References

CWE Common Weakness Enumeration

CWE-502

CAPEC Common Attack Pattern Enumeration and Classification

Object Injection CAPEC-586 An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

Vulnerable Configurations

cpe:2.3:a:codeception:codeception:-:*:*:*:*:*:*:*
cpe:2.3:a:codeception:codeception:-:*:*:*:*:*:*:*
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cpe:2.3:a:codeception:codeception:1.0.11:*:*:*:*:*:*:*
cpe:2.3:a:codeception:codeception:1.0.12:*:*:*:*:*:*:*
cpe:2.3:a:codeception:codeception:1.0.12:*:*:*:*:*:*:*
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cpe:2.3:a:codeception:codeception:4.1.21:*:*:*:*:*:*:*

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