sddmproject sddm CVE-2020-28049 vulnerability in Sddmproject and Other Products
Published on November 4, 2020

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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.

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Vulnerability Analysis

CVE-2020-28049 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality and integrity, and no impact on availability.

Attack Vector:
LOCAL
Attack Complexity:
HIGH
Privileges Required:
LOW
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

What is a Race Condition Vulnerability?

The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

CVE-2020-28049 has been classified to as a Race Condition vulnerability or weakness.


Products Associated with CVE-2020-28049

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2020-28049 are published in these products:

Sddmproject Sddm
 
Debian Linux
 
Fedora Project Fedora
 
OpenSuse Leap
 

Exploit Probability

EPSS
0.04%
Percentile
10.86%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.