CVE-2020-28049
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.
Does this matter?
Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 6.3 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.42% probability · 35th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- sddm project/sddm · opensuse/leap · debian/debian linux · fedoraproject/fedora
- Source
- cve@mitre.org
References
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.htmlMailing List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049Exploit, Issue Tracking, Third Party Advisory
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLogRelease Notes, Third Party Advisory
- https://github.com/sddm/sddm/releasesRelease Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00009.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
- 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 List, Third Party Advisory
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049Exploit, Issue Tracking, Third Party Advisory
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLogRelease Notes, Third Party Advisory
- https://github.com/sddm/sddm/releasesRelease Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/11/msg00009.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
- https://security.gentoo.org/glsa/202402-02
- https://www.debian.org/security/2020/dsa-4783Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.