ArchLinuxASA-202011-8[ASA-202011-8] sddm: privilege escalation
6.3 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.3 Low
CVSS2
Access Vector
Access Complexity
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:P/A:N
0.0004 Low
EPSS
Percentile
5.2%
Arch Linux Security Advisory ASA-202011-8
Severity: Medium
Date : 2020-11-10
CVE-ID : CVE-2020-28049
Package : sddm
Type : privilege escalation
Remote : No
Link : https://security.archlinux.org/AVG-1266
Summary
The package sddm before version 0.19.0-1 is vulnerable to privilege
escalation.
Resolution
Upgrade to 0.19.0-1.
pacman -Syu “sddm>=0.19.0-1”
The problem has been fixed upstream in version 0.19.0.
Workaround
None.
Description
A local privilege escalation has been discovered in the sddm display
manager < 0.19.0. If the auth file is empty, X allows any local
application (= any user on the system) to connect. This is currently
the case until X wrote the display number to sddm and sddm used that to
write the entry into the file.
Impact
A local user might be able to escalate privileges.
References
https://www.openwall.com/lists/oss-security/2020/11/04/2
https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222
https://security.archlinux.org/CVE-2020-28049
Related
6.3 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
3.3 Low
CVSS2
Access Vector
Access Complexity
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:P/A:N
0.0004 Low
EPSS
Percentile
5.2%