CVE-2020-28049: Race Condition
First published: Wed Nov 04 2020(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/sddm | 0.18.0-1+deb10u1 0.19.0-3 0.19.0-5 0.20.0-1 | |
| debian/sddm | <=0.18.1-1<=0.18.0-1 | 0.19.0-1 0.18.0-1+deb10u1 |
| Sddm Project Sddm | <0.19.0 | |
| openSUSE Leap | =15.1 | |
| openSUSE Leap | =15.2 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- https://www.openwall.com/lists/oss-security/2020/11/04/2
- https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222
- https://bugzilla.suse.com/show_bug.cgi?id=1177201
- https://security-tracker.debian.org/tracker/CVE-2020-28049
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28049
- https://www.preining.info
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=973748
- http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00031.html
- https://bugzilla.suse.com/show_bug.cgi?id=CVE-2020-28049
- https://github.com/sddm/sddm/blob/v0.19.0/ChangeLog
- https://github.com/sddm/sddm/releases
- https://lists.debian.org/debian-lts-announce/2020/11/msg00009.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
- https://www.debian.org/security/2020/dsa-4783
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GT3EX5NSQJJAKY63ENSMEDX6NYZLYY3S/
- https://security.gentoo.org/glsa/202402-02
Frequently Asked Questions
What is CVE-2020-28049?
CVE-2020-28049 is a vulnerability discovered in SDDM before version 0.19.0 that incorrectly starts the X server in a way that allows local unprivileged users to access X server display contents without proper authentication.
What is the severity of CVE-2020-28049?
CVE-2020-28049 has a severity value of 6.3, which is considered medium.
How does CVE-2020-28049 affect SDDM?
CVE-2020-28049 affects SDDM versions before 0.19.0 by allowing local unprivileged users to create a connection to the X server without proper authentication.
How can I fix CVE-2020-28049?
To fix CVE-2020-28049, it is recommended to update SDDM to version 0.19.0 or higher.
Where can I find more information about CVE-2020-28049?
More information about CVE-2020-28049 can be found in the references provided: [1] [2] [3].
- collector/security-tracker-debian
- collector/debian-bugs
- alias/CVE-2020-28049
- collector/nvd-index
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/author
- agent/severity
- agent/references
- agent/tags
- agent/weakness
- agent/description
- agent/first-publish-date
- agent/event
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- package-manager/debian
- vendor/sddm project
- canonical/sddm project sddm
- vendor/opensuse
- canonical/opensuse leap
- version/opensuse leap/15.1
- version/opensuse leap/15.2
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/33