RHEL 2.1 : openssh (RHSA-2006:0698)

High Nessus Plugin ID 22474


The remote Red Hat host is missing one or more security updates.


Updated openssh packages that fix several security issues in sshd are now available for Red Hat Enterprise Linux 2.1.

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)

An arbitrary command execution flaw was discovered in the way scp copies files locally. It is possible for a local attacker to create a file with a carefully crafted name that could execute arbitrary commands as the user running scp to copy files locally.

The SSH daemon, when restricting host access by numeric IP addresses and with VerifyReverseMapping disabled, allows remote attackers to bypass 'from=' and '[email protected]' address restrictions by connecting to a host from a system whose reverse DNS hostname contains the numeric IP address. (CVE-2003-0386)

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


Update the affected packages.

See Also






Plugin Details

Severity: High

ID: 22474

File Name: redhat-RHSA-2006-0698.nasl

Version: $Revision: 1.19 $

Type: local

Agent: unix

Published: 2006/09/29

Modified: 2016/12/29

Dependencies: 12634

Risk Information

Risk Factor: High


Base Score: 9.3

Temporal Score: 9.3

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

Temporal Vector: CVSS2#E:ND/RL:ND/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:openssh, p-cpe:/a:redhat:enterprise_linux:openssh-askpass, p-cpe:/a:redhat:enterprise_linux:openssh-askpass-gnome, p-cpe:/a:redhat:enterprise_linux:openssh-clients, p-cpe:/a:redhat:enterprise_linux:openssh-server, cpe:/o:redhat:enterprise_linux:2.1

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

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2006/09/28

Vulnerability Publication Date: 2003/06/05

Reference Information

CVE: CVE-2003-0386, CVE-2006-0225, CVE-2006-4924, CVE-2006-5051

OSVDB: 2112, 22692, 29152, 29264, 29266

RHSA: 2006:0698

CWE: 362, 399