SUSE SLES11 Security Update : openssh (SUSE-SU-2018:3781-1)

Medium Nessus Plugin ID 119032

Synopsis

The remote SUSE host is missing one or more security updates.

Description

This update for openssh fixes the following issues :

Following security issues have been fixed :

CVE-2018-15919: Remotely observable behaviour in auth-gss2.c in OpenSSH could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. OpenSSH developers do not want to treat such a username enumeration (or 'oracle') as a vulnerability.
(bsc#1106163)

CVE-2018-15473: OpenSSH was prone to a user existance oracle vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c. (bsc#1105010)

Also the following security related hardening change was done: Removed arcfour,blowfish,cast from list of default ciphers as they are long discontinued and should no longer be used. (bsc#982273)

And

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 11-SP4:zypper in -t patch slessp4-openssh-13867=1

SUSE Linux Enterprise Debuginfo 11-SP4:zypper in -t patch dbgsp4-openssh-13867=1

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1091396

https://bugzilla.suse.com/show_bug.cgi?id=1105010

https://bugzilla.suse.com/show_bug.cgi?id=1106163

https://bugzilla.suse.com/show_bug.cgi?id=964336

https://bugzilla.suse.com/show_bug.cgi?id=982273

https://www.suse.com/security/cve/CVE-2018-15473/

https://www.suse.com/security/cve/CVE-2018-15919/

http://www.nessus.org/u?ee5de829

Plugin Details

Severity: Medium

ID: 119032

File Name: suse_SU-2018-3781-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2018/11/19

Modified: 2018/11/19

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

CVSS v3.0

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:openssh, p-cpe:/a:novell:suse_linux:openssh-askpass-gnome, p-cpe:/a:novell:suse_linux:openssh-fips, p-cpe:/a:novell:suse_linux:openssh-helpers, cpe:/o:novell:suse_linux:11

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/SuSE/release, Host/SuSE/rpm-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2018/11/16

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2018-15473, CVE-2018-15919