OpenSUSE Linux update for openssh

Published: 2018-11-17 | Updated: 2023-03-09

Risk	Medium
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2018-15473 CVE-2018-15919
CWE-ID	CWE-388 CWE-200
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software Subscribe	Opensuse Operating systems & Components / Operating system
Vendor	SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) User enumeration

EUVDB-ID: #VU14440

Risk: Medium

CVSSv3.1: 5.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2018-15473

CWE-ID: CWE-388 - Error Handling

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to enumerate all accounts on the system.

The vulnerability exists due to a logical error in auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c files when processing authentication requests. A remote attacker can send a specially crafted chain of packets and monitor behavior of openssh server to determine presence of a valid username. The server will drop connection upon receiving a malformed authentication packets if the username is valid.

Mitigation

Update the affected packages.

Vulnerable software versions

Opensuse: 15.0

External links

http://lists.opensuse.org/opensuse-security-announce/2018-11/msg00023.html

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. However, a fully functional exploit for this vulnerability is available.

2) Information disclosure

EUVDB-ID: #VU14548

Risk: Low

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2018-15919

CWE-ID: CWE-200 - Information exposure

Exploit availability: No