SUSE SLES11 Security Update : openssh (SUSE-SU-2018:3540-1)

High Nessus Plugin ID 118498

Synopsis

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

Description

This update for openssh fixes the following issues :

Security issues 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-2017-15906: The process_open function in sftp-server.c in OpenSSH did not properly prevent write operations in readonly mode, which allowed attackers to create zero-length files. (bsc#1065000, bsc#1106726)

CVE-2016-10708: sshd allowed remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via an out-of-sequence NEWKEYS message, as demonstrated by Honggfuzz, related to kex.c and packet.c. (bsc#1076957)

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)

CVE-2016-10012: Removed pre-auth compression support from the server to prevent possible cryptographic attacks. (bsc#1016370)

Bugs fixed: Fixed failing 'AuthorizedKeysCommand' within a 'Match User' block in sshd_config (bsc#1105180)

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-SP3-LTSS:zypper in -t patch slessp3-openssh-13848=1

SUSE Linux Enterprise Point of Sale 11-SP3:zypper in -t patch sleposp3-openssh-13848=1

SUSE Linux Enterprise Debuginfo 11-SP3:zypper in -t patch dbgsp3-openssh-13848=1

See Also

https://bugzilla.suse.com/show_bug.cgi?id=1016370

https://bugzilla.suse.com/show_bug.cgi?id=1065000

https://bugzilla.suse.com/show_bug.cgi?id=1076957

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

https://bugzilla.suse.com/show_bug.cgi?id=1105180

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

https://bugzilla.suse.com/show_bug.cgi?id=1106726

https://www.suse.com/security/cve/CVE-2016-10012/

https://www.suse.com/security/cve/CVE-2016-10708/

https://www.suse.com/security/cve/CVE-2017-15906/

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

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

http://www.nessus.org/u?bf4c0b95

Plugin Details

Severity: High

ID: 118498

File Name: suse_SU-2018-3540-1.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2018/10/30

Modified: 2018/12/01

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.2

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

CVSS v3.0

Base Score: 7.8

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

Vulnerability Information

CPE: p-cpe:/a:novell:suse_linux:openssh, p-cpe:/a:novell:suse_linux:openssh-askpass, p-cpe:/a:novell:suse_linux:openssh-askpass-gnome, 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: 2018/10/28

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2016-10012, CVE-2016-10708, CVE-2017-15906, CVE-2018-15473, CVE-2018-15919