Vulnerability identifier: #VU48419
Vulnerability risk: Low
CVSSv3.1: 5.5 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-362
Exploitation vector: Local
Exploit availability: No
Vulnerable software:
sddm
Other software /
Other software solutions
Vendor: Simple Desktop Display Manager
Description
The vulnerability allows a local authenticated user to read and manipulate data.
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.
Mitigation
Install update from vendor's website.
Vulnerable software versions
sddm: 0.10.0 - 0.18.1
External links
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html
http://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049
http://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
http://github.com/sddm/sddm/releases
http://lists.debian.org/debian-lts-announce/2020/11/msg00009.html
http://www.debian.org/security/2020/dsa-4783
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.