CVE-2020-8332 Vulnerability Analysis & Exploit Details

Status: Modified - Last modified: 21 Nov 2024, 05:38 UTC Published: 14 Oct 2020, 22:15 UTC

CVE-2020-8332
Vulnerability Scoring

6.4
/10

Attack Complexity Details

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

CIA Impact Definition

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

CVE-2020-8332 Vulnerability Summary

A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x servers may allow arbitrary code execution. Servers operating in UEFI mode are not affected.

Access Complexity Graph

Above is the Access Complexity Graph for CVE-2020-8332. 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-2020-8332, 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-2020-8332, 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: 0.044% (probability of exploit)

EPSS Percentile: 15.09% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 84.91% of others.

CVE-2020-8332 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:h:lenovo:bladecenter_hs23:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:bladecenter_hs23:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:bladecenter_hs23e:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:bladecenter_hs23e:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:compute_node-x440:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:compute_node-x440:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:flex_system_x220:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:flex_system_x220:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:flex_system_x240:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:flex_system_x240:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:flex_system_x440:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:flex_system_x440:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:nextscale_nx360_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:nextscale_nx360_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3300_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3300_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3500_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3500_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3530_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3530_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3550_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3550_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3630_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3630_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3650_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3650_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3650_m4_bd:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3650_m4_bd:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3650_m4_hd:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3650_m4_hd:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:-:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:4.4:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:4.4:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:4.90:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:4.90:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:5.30:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:5.30:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:a5e124b:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:a5e124b:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:system_x3750_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:system_x3750_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:o:lenovo:system_x3750_m4_firmware:a5e130a:*:*:*:*:*:*:*
    cpe:2.3:o:lenovo:system_x3750_m4_firmware:a5e130a:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:idataplex_dx360_m4:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:idataplex_dx360_m4:-:*:*:*:*:*:*:*
  • cpe:2.3:h:lenovo:idataplex_dx360_m4_water_cooled:-:*:*:*:*:*:*:*
    cpe:2.3:h:lenovo:idataplex_dx360_m4_water_cooled:-:*:*:*:*:*:*:*

CVSS3 Source

psirt@lenovo.com

CVSS3 Type

Secondary

CVSS3 Vector

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

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