CVE-2020-8336 Vulnerability Analysis & Exploit Details

CVE-2020-8336
Vulnerability Scoring

6.4
/10
High Risk

If left unpatched, CVE-2020-8336 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Physical
    Physical access is required to exploit this vulnerability.
  • 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-2020-8336 Details

Status: Modified

Last updated: 🕠 21 Nov 2024, 05:38 UTC
Originally published on: 🕗 09 Jun 2020, 20:15 UTC

Time between publication and last update: 1625 days

CVSS Release: version 3

CVSS3 Source

psirt@lenovo.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2020-8336 Vulnerability Summary

CVE-2020-8336: Lenovo implemented Intel CSME Anti-rollback ARB protections on some ThinkPad models to prevent roll back of CSME Firmware in flash.

Assessing the Risk of CVE-2020-8336

Access Complexity Graph

The exploitability of CVE-2020-8336 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-2020-8336

CVE-2020-8336 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-2020-8336, 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-2020-8336, 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-2020-8336 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2020-8336 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: High
    CVE-2020-8336 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: 0.07% (probability of exploit)

EPSS Percentile: 33.9% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 66.1% of others.

CVE-2020-8336 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:lenovo:thinkpad_e14_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e14_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e14_firmware:1.23:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e14_firmware:1.23:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_e14:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_e14:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e15_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e15_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e15_firmware:1.23:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e15_firmware:1.23:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_e15:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_e15:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_r14:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_r14:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s3_gen_2:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s3_gen_2:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490s_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490s_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490s_firmware:1.34:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490s_firmware:1.34:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490s_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490s_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_e490s:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_e490s:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s3_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s3_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s3_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s3_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s3:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s3:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490_firmware:1.34:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490_firmware:1.34:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e490_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e490_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_e490:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_e490:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e590_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e590_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e590_firmware:1.34:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e590_firmware:1.34:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_e590_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_e590_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_e590:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_e590:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_r490_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_r490_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_r490_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_r490_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_r490:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_r490:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_r590_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_r590_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_r590_firmware:5.2.321.26:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_r590_firmware:5.2.321.26:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_r590:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_r590:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l13_1st_gen:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l13_1st_gen:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l1415_gen_1:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l1415_gen_1:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:6.0.8757.1:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l390_yoga_firmware:6.0.8757.1:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l390_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l390_yoga:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s2_yoga_4th_gen_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s2_yoga_4th_gen_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_s2_yoga_4th_gen_firmware:6.0.8757.1:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_s2_yoga_4th_gen_firmware:6.0.8757.1:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_s2_yoga_4th_gen:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_s2_yoga_4th_gen:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l490_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l490_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l490_firmware:1.32:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l490_firmware:1.32:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l490:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l490:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l590_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l590_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_l590_firmware:1.32:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_l590_firmware:1.32:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_l590:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_l590:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p1_\(20mx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p1_\(20mx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p1_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p1_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_p43s_\(20rx\)_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_p43s_\(20rx\)_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p43s_\(20rx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p43s_\(20rx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p52_\(20mx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p52_\(20mx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p53_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p53_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p53s_\(20nx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p53s_\(20nx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p72_\(20mx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p72_\(20mx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_p73_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_p73_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t490_\(20nx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t490_\(20nx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t490_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t490_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t490_\(20rx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t490_\(20rx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t490s_\(20nx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t490s_\(20nx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_t590_\(20nx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_t590_\(20nx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_carbon_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_carbon_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_carbon_\(20rx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_carbon_\(20rx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_extreme_\(20mx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_extreme_\(20mx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_extreme_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_extreme_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_yoga_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_yoga_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x1_yoga_\(20sx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x1_yoga_\(20sx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x390_\(20qx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x390_\(20qx\):-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x390_\(20sx\):-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x390_\(20sx\):-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:1.95:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:1.95:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:6.0.36.1105:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:6.0.36.1105:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:2020-06-24:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:thinkpad_x390_yoga_firmware:2020-06-24:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:thinkpad_x390_yoga:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:thinkpad_x390_yoga:-:*:*:*:*:*:*:*

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