SUSE SLES11 Security Update : openssh (SUSE-SU-2015:1840-1) (Logjam)

High Nessus Plugin ID 86695

Synopsis

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

Description

openssh was updated to fix four security issues.

These security issues were fixed :

- CVE-2015-5352: The x11_open_helper function in channels.c in ssh in OpenSSH when ForwardX11Trusted mode is not used, lacked a check of the refusal deadline for X connections, which made it easier for remote attackers to bypass intended access restrictions via a connection outside of the permitted time window (bsc#936695).

- CVE-2015-5600: The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH did not properly restrict the processing of keyboard-interactive devices within a single connection, which made it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list (bsc#938746).

- CVE-2015-4000: Removed and disabled weak DH groups (bsc#932483).

- Hardening patch to fix sftp RCE (bsc#903649).

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 YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Server 11-SP2-LTSS :

zypper in -t patch slessp2-openssh-12168=1

To bring your system up-to-date, use 'zypper patch'.

See Also

https://bugzilla.suse.com/show_bug.cgi?id=673532

https://bugzilla.suse.com/show_bug.cgi?id=903649

https://bugzilla.suse.com/show_bug.cgi?id=905118

https://bugzilla.suse.com/show_bug.cgi?id=914309

https://bugzilla.suse.com/show_bug.cgi?id=932483

https://bugzilla.suse.com/show_bug.cgi?id=936695

https://bugzilla.suse.com/show_bug.cgi?id=938746

https://www.suse.com/security/cve/CVE-2015-4000/

https://www.suse.com/security/cve/CVE-2015-5352/

https://www.suse.com/security/cve/CVE-2015-5600/

http://www.nessus.org/u?e7517ec1

Plugin Details

Severity: High

ID: 86695

File Name: suse_SU-2015-1840-1.nasl

Version: 2.7

Type: local

Agent: unix

Published: 2015/11/02

Updated: 2018/11/29

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 8.5

Temporal Score: 6.3

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 3.7

Temporal Score: 3.2

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

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: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/10/19

Reference Information

CVE: CVE-2015-4000, CVE-2015-5352, CVE-2015-5600

BID: 74733, 75525