Executive Summary

Summary
Title New openssh-krb5 packages fix denial of service and potential execution of arbitrary code
Informations
Name DSA-1189 First vendor Publication 2006-10-04
Vendor Debian Last vendor Modification 2006-10-04
Severity (Vendor) N/A Revision 1

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:C/I:C/A:C)
Cvss Base Score 9.3 Attack Range Network
Cvss Impact Score 10 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Several remote vulnerabilities have been discovered in OpenSSH, a free implementation of the Secure Shell protocol, which may lead to denial of service and potentially the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following problems:

CVE-2006-4924

Tavis Ormandy of the Google Security Team discovered a denial of service vulnerability in the mitigation code against complexity attacks, which might lead to increased CPU consumption until a timeout is triggered. This is only exploitable if support for SSH protocol version 1 is enabled.

CVE-2006-5051

Mark Dowd discovered that insecure signal handler usage could potentially lead to execution of arbitrary code through a double free. The Debian Security Team doesn't believe the general openssh package without Kerberos support to be exploitable by this issue. However, due to the complexity of the underlying code we will issue an update to rule out all eventualities.

For the stable distribution (sarge) these problems have been fixed in version 3.8.1p1-7sarge1.

For the unstable distribution (sid) these problems have been fixed in version 4.3p2-4 of openssh. openssh-krb5 will soon be converted towards a transitional package against openssh.

We recommend that you upgrade your openssh-krb5 packages.

Original Source

Url : http://www.debian.org/security/2006/dsa-1189

CWE : Common Weakness Enumeration

% Id Name
50 % CWE-415 Double Free
50 % CWE-399 Resource Management Errors

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:10462
 
Oval ID: oval:org.mitre.oval:def:10462
Title: sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector.
Description: sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector.
Family: unix Class: vulnerability
Reference(s): CVE-2006-4924
 Version: 5
Platform(s): Red Hat Enterprise Linux 3
CentOS Linux 3
Red Hat Enterprise Linux 4
CentOS Linux 4
Oracle Linux 4
 Product(s):
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:11387
 
Oval ID: oval:org.mitre.oval:def:11387
Title: Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.
Description: Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code if GSSAPI authentication is enabled, via unspecified vectors that lead to a double-free.
Family: unix Class: vulnerability
Reference(s): CVE-2006-5051
 Version: 5
Platform(s): Red Hat Enterprise Linux 3
CentOS Linux 3
Red Hat Enterprise Linux 4
CentOS Linux 4
Oracle Linux 4
 Product(s):
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:1193
 
Oval ID: oval:org.mitre.oval:def:1193
Title: Security Vulnerability in the sshd(1M) Protocol Version 1 Implementation May Allow a Denial of Service to the Host
Description: sshd in OpenSSH before 4.4, when using the version 1 SSH protocol, allows remote attackers to cause a denial of service (CPU consumption) via an SSH packet that contains duplicate blocks, which is not properly handled by the CRC compensation attack detector.
Family: unix Class: vulnerability
Reference(s): CVE-2006-4924
 Version: 1
Platform(s): Sun Solaris 9
Sun Solaris 10
 Product(s):
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Application 90
Os 50
Os 49
Os 1

OpenVAS Exploits

Date Description
2009-11-17 Name : Mac OS X Version
File : nvt/macosx_version.nasl
2009-10-10 Name : SLES9: Security update for OpenSSH
File : nvt/sles9p5019505.nasl
2009-02-27 Name : Fedora Update for openssh FEDORA-2007-395
File : nvt/gb_fedora_2007_395_openssh_fc5.nasl
2008-09-24 Name : Debian Security Advisory DSA 1638-1 (openssh)
File : nvt/deb_1638_1.nasl
2008-09-24 Name : Gentoo Security Advisory GLSA 200609-17 (openssh)
File : nvt/glsa_200609_17.nasl
2008-09-24 Name : Gentoo Security Advisory GLSA 200611-06 (openssh)
File : nvt/glsa_200611_06.nasl
2008-09-04 Name : FreeBSD Ports: openssh
File : nvt/freebsd_openssh.nasl
2008-09-04 Name : FreeBSD Security Advisory (FreeBSD-SA-06:22.openssh.asc)
File : nvt/freebsdsa_openssh3.nasl
2008-01-17 Name : Debian Security Advisory DSA 1189-1 (openssh-krb5)
File : nvt/deb_1189_1.nasl
2008-01-17 Name : Debian Security Advisory DSA 1212-1 (openssh (1:3.8.1p1-8.sarge.6))
File : nvt/deb_1212_1.nasl
0000-00-00 Name : Slackware Advisory SSA:2006-272-02 openssh
File : nvt/esoft_slk_ssa_2006_272_02.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
29264 OpenSSH Signal Handler Pre-authentication Race Condition Code Execution

OpenSSH (portable) contains a flaw that may allow a remote attacker to execute arbitrary code under some circumstances. When configured with GSSAPI authentication, the signal handler is prone to a race condition that could be exploited to conduct a Denial of Service and possibly execute arbitrary code. No further details have been provided. Note: On OpenSSH, this vulnerability can only be leveraged for a remote Denial of Service. The conditions for remote exploitation to execute arbitrary code are considered to be unlikely.
29152 OpenSSH Identical Block Packet DoS

OpenSSH contains a flaw that may allow a pre-authentication remote denial of service. The issue is triggered when SSH version 1 is used via an SSH packet that contains duplicate blocks, and will result in loss of availability for the service.

Information Assurance Vulnerability Management (IAVM)

Date Description
2012-08-16 IAVM : 2012-A-0136 - Multiple Vulnerabilities in Juniper Network Management Products
Severity : Category I - VMSKEY : V0033662

Snort® IPS/IDS

Date Description
2014-01-10 OpenSSH sshd identical blocks DoS attempt
RuleID : 17317 - Revision : 11 - Type : SERVER-OTHER

Nessus® Vulnerability Scanner

Date Description
2016-01-28 Name : The remote device is missing a vendor-supplied security patch.
File : f5_bigip_SOL6736.nasl - Type : ACT_GATHER_INFO
2013-09-13 Name : The remote host is affected by multiple vulnerabilities.
File : juniper_nsm_2012_1.nasl - Type : ACT_GATHER_INFO
2013-07-12 Name : The remote Oracle Linux host is missing one or more security updates.
File : oraclelinux_ELSA-2006-0697.nasl - Type : ACT_GATHER_INFO
2011-08-29 Name : The SSH service running on the remote host has an information disclosure vuln...
File : sunssh_plaintext_recovery.nasl - Type : ACT_GATHER_INFO
2009-04-23 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-649-1.nasl - Type : ACT_GATHER_INFO
2008-09-17 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-1638.nasl - Type : ACT_GATHER_INFO
2007-12-13 Name : The remote SuSE 10 host is missing a security-related patch.
File : suse_openssh-2184.nasl - Type : ACT_GATHER_INFO
2007-11-10 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-355-1.nasl - Type : ACT_GATHER_INFO
2007-10-17 Name : The remote openSUSE host is missing a security update.
File : suse_openssh-2183.nasl - Type : ACT_GATHER_INFO
2007-04-05 Name : The remote Fedora Core host is missing a security update.
File : fedora_2007-395.nasl - Type : ACT_GATHER_INFO
2007-03-13 Name : The remote host is missing a Mac OS X update which fixes a security issue.
File : macosx_10_4_9.nasl - Type : ACT_GATHER_INFO
2007-02-18 Name : The remote Mandrake Linux host is missing one or more security updates.
File : mandrake_MDKSA-2006-179.nasl - Type : ACT_GATHER_INFO
2007-02-18 Name : The remote host is missing a vendor-supplied security patch
File : suse_SA_2006_062.nasl - Type : ACT_GATHER_INFO
2007-01-17 Name : The remote Fedora Core host is missing a security update.
File : fedora_2006-1011.nasl - Type : ACT_GATHER_INFO
2006-11-20 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200611-06.nasl - Type : ACT_GATHER_INFO
2006-11-20 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-1212.nasl - Type : ACT_GATHER_INFO
2006-10-14 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-1189.nasl - Type : ACT_GATHER_INFO
2006-10-02 Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_32db37a550c311dbacf3000c6ec775d9.nasl - Type : ACT_GATHER_INFO
2006-10-02 Name : The remote CentOS host is missing one or more security updates.
File : centos_RHSA-2006-0697.nasl - Type : ACT_GATHER_INFO
2006-09-29 Name : The remote Slackware host is missing a security update.
File : Slackware_SSA_2006-272-02.nasl - Type : ACT_GATHER_INFO
2006-09-29 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2006-0697.nasl - Type : ACT_GATHER_INFO
2006-09-29 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2006-0698.nasl - Type : ACT_GATHER_INFO
2006-09-28 Name : The remote SSH server is affected by multiple vulnerabilities.
File : openssh_44.nasl - Type : ACT_GATHER_INFO
2006-09-28 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200609-17.nasl - Type : ACT_GATHER_INFO

Alert History

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0
Date Informations
2014-02-17 11:26:15
  • Multiple Updates