Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sddm Project | Sddm | < 0.19.0 |
| Opensuse | Leap | 15.1 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 33 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.htmlMailing ListThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049ExploitIssue TrackingThird Party Advisory
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLogRelease NotesThird Party Advisory
- https://github.com/sddm/sddm/releasesRelease NotesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-02
- https://www.debian.org/security/2020/dsa-4783Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.htmlMailing ListThird Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049ExploitIssue TrackingThird Party Advisory
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLogRelease NotesThird Party Advisory
- https://github.com/sddm/sddm/releasesRelease NotesThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202402-02
FAQ
What is CVE-2020-28049?
CVE-2020-28049 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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 witho...
How severe is CVE-2020-28049?
CVE-2020-28049 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-28049?
Check the references section above for vendor advisories and patch information. Affected products include: Sddm Project Sddm, Opensuse Leap, Debian Debian Linux, Fedoraproject Fedora.