CVE-2020-27252 Vulnerability Analysis & Exploit Details

Status: Analyzed - Last modified: 15 Dec 2020, 16:40 UTC Published: 14 Dec 2020, 20:15 UTC

CVE-2020-27252
Vulnerability Scoring

8.1
/10

Attack Complexity Details

  • Attack Complexity: HIGH IMPACT
  • Attack Vector: NETWORK
  • Privileges Required: None
  • Scope: UNCHANGED
  • User Interaction: NONE

CIA Impact Definition

  • Confidentiality: HIGH IMPACT
  • Integrity: HIGH IMPACT
  • Availability: HIGH IMPACT

CVE-2020-27252 Vulnerability Summary

Medtronic MyCareLink Smart 25000 all versions are vulnerable to a race condition in the MCL Smart Patient Reader software update system, which allows unsigned firmware to be uploaded and executed on the Patient Reader. If exploited an attacker could remotely execute code on the MCL Smart Patient Reader device, leading to control of the device.

Access Complexity Graph

Above is the Access Complexity Graph for CVE-2020-27252. It helps visualize the difficulty level and privilege requirements needed to exploit this vulnerability, providing a quick assessment of its exploitation feasibility.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2020-27252, 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.

Impact Analysis

Below is the Impact Analysis for CVE-2020-27252, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Exploit Prediction Scoring System (EPSS)

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

EPSS Score: 1.996% (probability of exploit)

EPSS Percentile: 88.73% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 11.269999999999996% of others.

CVE-2020-27252 Detailed Information and External References

References

CWE

CWE-367

CAPEC

  • Leveraging Race Conditions via Symbolic Links CAPEC-27 This attack leverages the use of symbolic links (Symlinks) in order to write to sensitive files. An attacker can create a Symlink link to a target file not otherwise accessible to them. When the privileged program tries to create a temporary file with the same name as the Symlink link, it will actually write to the target file pointed to by the attackers' Symlink link. If the attacker can insert malicious content in the temporary file they will be writing to the sensitive file by using the Symlink. The race occurs because the system checks if the temporary file exists, then creates the file. The attacker would typically create the Symlink during the interval between the check and the creation of the temporary 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:o:medtronic:mycarelink_smart_model_25000_firmware:*:*:*:*:*:*:*:*
    cpe:2.3:o:medtronic:mycarelink_smart_model_25000_firmware:*:*:*:*:*:*:*:*
  • cpe:2.3:h:medtronic:mycarelink_smart_model_25000:-:*:*:*:*:*:*:*
    cpe:2.3:h:medtronic:mycarelink_smart_model_25000:-:*:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

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