CVE-2020-28049
Severity
6.3MEDIUM
EPSS
0.0%
top 88.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedNov 4
Latest updateMay 24
Description
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 1.0 | Impact: 5.2
Affected Packages3 packages
Also affects: Debian Linux 10.0, 9.0, Fedora 33
🔴Vulnerability Details
3📋Vendor Advisories
1Debian▶
CVE-2020-28049: sddm - An issue was discovered in SDDM before 0.19.0. It incorrectly starts the X serve...↗2020
💬Community
3Bugzilla▶
CVE-2020-28049 sddm: local privilege escalation due to race condition in creation of the Xauthority file [epel-all]↗2020-11-04
Bugzilla▶
CVE-2020-28049 sddm: local privilege escalation due to race condition in creation of the Xauthority file [fedora-all]↗2020-11-04
Bugzilla▶
CVE-2020-28049 sddm: local privilege escalation due to race condition in creation of the Xauthority file↗2020-11-04