CVE-2020-28049: Vulnerability Analysis & Exploit Details

Status: Modified - Last modified: 15-10-2024 Published: 04-11-2020

CVE-2020-28049
Vulnerability Scoring

6.3
/10

Attack Complexity Details

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

CIA Impact Definition

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

CVE-2020-28049 Vulnerability Summary

An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X server in a way that - for a short time period - allows local unprivileged users to create a connection to the X server without providing proper authentication. A local attacker can thus access X server display contents and, for example, intercept keystrokes or access the clipboard. This is caused by a race condition during Xauthority file creation.

Access Complexity Graph for CVE-2020-28049

Impact Analysis for CVE-2020-28049

CVE-2020-28049: Detailed Information and External References

EPSS

0.00042

EPSS %

0.05028

References

0.00042

CWE

CWE-362

CAPEC

0.00042

  • Leveraging Race Conditions: 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: 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:sddm_project:sddm:-:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:-:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.8.99:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.8.99:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:sddm_project:sddm:0.18.1:*:*:*:*:*:*:*
    cpe:2.3:a:sddm_project:sddm:0.18.1:*:*:*:*:*:*:*
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
    cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
  • cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
    cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
    cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

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

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