Risk | High |
Patch available | YES |
Number of vulnerabilities | 1 |
CVE-ID | CVE-2018-20839 |
CWE-ID | CWE-255 |
Exploitation vector | Network |
Public exploit | N/A |
Vulnerable software Subscribe |
systemd Server applications / Other server solutions |
Vendor | Freedesktop.org |
Security Bulletin
This security bulletin contains one high risk vulnerability.
EUVDB-ID: #VU35894
Risk: High
CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-20839
CWE-ID:
CWE-255 - Credentials Management
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
systemd 242 changes the VT1 mode upon a logout, which allows attackers to read cleartext passwords in certain circumstances, such as watching a shutdown, or using Ctrl-Alt-F1 and Ctrl-Alt-F2. This occurs because the KDGKBMODE (aka current keyboard mode) check is mishandled.
MitigationInstall update from vendor's website.
Vulnerable software versionssystemd: 242
External linkshttp://www.securityfocus.com/bid/108389
http://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1803993
http://github.com/systemd/systemd/commit/9725f1a10f80f5e0ae7d9b60547458622aeb322f
http://github.com/systemd/systemd/pull/12378
http://security.netapp.com/advisory/ntap-20190530-0002/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.