Bug#973748: sddm: CVE-2020-28049: local privilege escalation due to race condition in creation of the Xauthority file

[Salvatore Bonaccorso <carnil@debian.org>]

Source: sddm
Version: 0.18.1-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for sddm.

CVE-2020-28049[0]:
| local privilege escalation due to race condition in creation of the
| Xauthority file

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2020-28049
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-28049
[1] https://github.com/sddm/sddm/commit/be202f533ab98a684c6a007e8d5b4357846bc222
[2] https://bugzilla.suse.com/show_bug.cgi?id=1177201
[3] https://www.openwall.com/lists/oss-security/2020/11/04/2

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore