CVE-2021-39212 Vulnerability Analysis & Exploit Details

CVE-2021-39212
Vulnerability Scoring

4.4

/10

Medium Risk

The vulnerability CVE-2021-39212 could compromise system integrity but typically requires user interaction to be exploited.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Local
Vulnerability requires local system access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2021-39212 Details

Status: Modified

Last updated: 🕕 21 Nov 2024, 06:18 UTC
Originally published on: 🕕 13 Sep 2021, 18:15 UTC

Time between publication and last update: 1164 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2021-39212 Vulnerability Summary

CVE-2021-39212: ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you may use, copy, modify, and distribute in both open and proprietary applications. In affected versions and in certain cases, Postscript files could be read and written when specifically excluded by a `module` policy in `policy.xml`. ex. <policy domain="module" rights="none" pattern="PS" />. The issue has been resolved in ImageMagick 7.1.0-7 and in 6.9.12-22. Fortunately, in the wild, few users utilize the `module` policy and instead use the `coder` policy that is also our workaround recommendation: <policy domain="coder" rights="none" pattern="{PS,EPI,EPS,EPSF,EPSI}" />.

Assessing the Risk of CVE-2021-39212

Access Complexity Graph

The exploitability of CVE-2021-39212 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-2021-39212

CVE-2021-39212 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

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-2021-39212, 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-2021-39212, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: Low
CVE-2021-39212 could lead to minor leaks of non-critical information without major privacy breaches.
Integrity: Low
Exploiting CVE-2021-39212 may cause minor changes to data without severely impacting its accuracy.
Availability: None
CVE-2021-39212 does not impact system availability.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 0.064% (probability of exploit)

EPSS Percentile: 30.96% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 69.03999999999999% of others.

CVE-2021-39212 References

External References

CWE Common Weakness Enumeration

CWE-362

CAPEC Common Attack Pattern Enumeration and Classification

Leveraging Race Conditions CAPEC-26 The adversary targets a race condition occurring when multiple processes access and manipulate the same resource concurrently, and the outcome of the execution depends on the particular order in which the access takes place. The adversary can leverage a race condition by "running the race", modifying the resource and modifying the normal execution flow. For instance, a race condition can occur while accessing a file: the adversary can trick the system by replacing the original file with their version and cause the system to read the malicious file.
Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions CAPEC-29 This attack targets a race condition occurring between the time of check (state) for a resource and the time of use of a resource. A typical example is file access. The adversary can leverage a file access race condition by "running the race", meaning that they would modify the resource between the first time the target program accesses the file and the time the target program uses the file. During that period of time, the adversary could replace or modify the file, causing the application to behave unexpectedly.

Vulnerable Configurations

cpe:2.3:a:imagemagick:imagemagick:6.9.12-0:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-0:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-1:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-1:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-10:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-10:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-11:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-11:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-12:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-12:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-14:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-14:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-15:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-15:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-16:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-16:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-17:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-17:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-18:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-18:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-19:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-19:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-2:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-2:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-20:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-20:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-21:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:6.9.12-21:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-0:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-0:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-1:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-1:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-10:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-10:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-11:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-11:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-12:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-12:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-13:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-13:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-14:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-14:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-15:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-15:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-16:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-16:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-17:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-17:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-18:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-18:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-19:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-19:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-2:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-2:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-20:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-20:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-21:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-21:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-22:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-22:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-23:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-23:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-24:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-24:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-25:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-25:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-26:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-26:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-27:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-27:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-28:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-28:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-29:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-29:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-3:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-3:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-30:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-30:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-31:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-31:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-32:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-32:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-33:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-33:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-34:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-34:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-35:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-35:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-36:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-36:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-37:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-37:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-38:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-38:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-39:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-39:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-4:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-4:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-40:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-40:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-41:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-41:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-42:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-42:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-43:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-43:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-44:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-44:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-45:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-45:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-46:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-46:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-47:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-47:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-48:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-48:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-49:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-49:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-5:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-5:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-50:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-50:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-51:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-51:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-52:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-52:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-53:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-53:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-54:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-54:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-55:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-55:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-56:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-56:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-57:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-57:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-58:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-58:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-59:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-59:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-6:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-6:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-60:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-60:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-61:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-61:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-62:*:*:*:*:*:*:*
cpe:2.3:a:imagemagick:imagemagick:7.1.0-62:*:*:*:*:*:*:*

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