CentOS 3 / 4 : openssh / openssl (CESA-2006:0697)

High Nessus Plugin ID 22485

Synopsis

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

Description

Updated openssh packages that fix two security flaws are now available for Red Hat Enterprise Linux 3 and 4.

This update has been rated as having important security impact by the Red Hat Security Response Team.

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. This package includes the core files necessary for both the OpenSSH client and server.

Mark Dowd discovered a signal handler race condition in the OpenSSH sshd server. A remote attacker could possibly leverage this flaw to cause a denial of service (crash). (CVE-2006-5051) The OpenSSH project believes the likelihood of successful exploitation leading to arbitrary code execution appears remote. However, the Red Hat Security Response Team have not yet been able to verify this claim due to lack of upstream vulnerability information. We are therefore including a fix for this flaw and have rated it important security severity in the event our continued investigation finds this issue to be exploitable.

Tavis Ormandy of the Google Security Team discovered a denial of service bug in the OpenSSH sshd server. A remote attacker can send a specially crafted SSH-1 request to the server causing sshd to consume a large quantity of CPU resources. (CVE-2006-4924)

All users of openssh should upgrade to these updated packages, which contain backported patches that resolves these issues.

Solution

Update the affected openssh and / or openssl packages.

See Also

http://www.nessus.org/u?42ac1cd5

http://www.nessus.org/u?8500f549

http://www.nessus.org/u?4eca25d6

http://www.nessus.org/u?da00f6c1

http://www.nessus.org/u?b734a975

http://www.nessus.org/u?e63f62ee

http://www.nessus.org/u?59033243

Plugin Details

Severity: High

ID: 22485

File Name: centos_RHSA-2006-0697.nasl

Version: 1.19

Type: local

Agent: unix

Published: 2006/10/02

Updated: 2019/10/25

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 9.3

Temporal Score: 7.3

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

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

Vulnerability Information

CPE: p-cpe:/a:centos:centos:openssh, p-cpe:/a:centos:centos:openssh-askpass, p-cpe:/a:centos:centos:openssh-askpass-gnome, p-cpe:/a:centos:centos:openssh-clients, p-cpe:/a:centos:centos:openssh-server, p-cpe:/a:centos:centos:openssl, p-cpe:/a:centos:centos:openssl-devel, p-cpe:/a:centos:centos:openssl-perl, p-cpe:/a:centos:centos:openssl096b, cpe:/o:centos:centos:3, cpe:/o:centos:centos:4

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2006/09/29

Vulnerability Publication Date: 2006/09/26

Reference Information

CVE: CVE-2006-4924, CVE-2006-5051, CVE-2006-5052

BID: 20216, 20241

RHSA: 2006:0697

CWE: 362, 399