CVE-2020-17489
Description
From CVE.org
An issue was discovered in certain configurations of GNOME gnome-shell through 3.36.4. When logging out of an account, the password box from the login dialog reappears with the password still visible. If the user had decided to have the password shown in cleartext at login time, it is then visible for a brief moment upon a logout. (If the password were never shown in cleartext, only the password length is revealed.)
Statement
This flaw does not affect gnome-shell as shipped with Red Hat Enterprise Linux 6 or 7. For 6, there is no option to view the password in the clear at login, and for 7, the login screen is killed upon login.
Mitigation
Do not use the "view password" context menu option when logging into gnome-shell.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.3 | 4.3 | N/A |
| Attack Vector | Physical | Physical | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | High | High | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD: CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Red Hat CVSS v3 Score Explanation
AV:P because this would require someone to have physical access to observe or record a password. One example of an attack would be that a user leaves to take a break from the machine and forgets to log out, an attacker sits down in their spot and logs them out while recording the screen with a camera, then plays back the footage to grab the password. As such, UI:R because a user would need to take some action for this attack to be possible. PR:N as an attacker wouldn't need privileges on the machine per se.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Application Data
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