OpenSSH identical block denial of service
| openssh-block-dos (29158) |  Low Risk |
Description:
OpenSSH is vulnerable to a denial of service caused by improper handling of identical blocks in an SSH packet. If SSH protocol 1 is enabled, a remote attacker could send a specially-crafted SSH packet to cause the system to consume all available CPU resources, resulting in a denial of service.
*CVSS:
| Base Score: | 2.8 |
| Access Vector: | Remote |
| Access Complexity: | High |
| Authentication: | Not Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 2.1 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
Upgrade to the latest version of Mac OS X (10.4.9 or later) or apply Apple Security Update 2007-003. See References.
Apply the appropriate patch for your system, as listed in Red Hat Bugzilla Bug 207955. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 200609-17 for patch, upgrade, or suggested workaround information. See References.
For Red Hat Linux:
Refer to RHSA-2006:0697-9 for patch, upgrade, or suggested workaround information. See References.
For Red Hat Linux 2.1:
Refer to RHSA-2006:0698-8 for patch, upgrade, or suggested workaround information. See References.
For Debian GNU/Linux (krb5):
Refer to DSA-1189-1 for patch, upgrade, or suggested workaround information. See References.
For Debian GNU/Linux (openssh):
Refer to DSA-1212-1 for patch, upgrade, or suggested workaround information. See References.
For HP-UX Secure Shell:
Refer to HPSBUX02178 SSRT061267 for patch, upgrade, or suggested workaround information. See References.
For SUSE Linux:
Refer to SUSE-SA:2006:062 for patch, upgrade, or suggested workaround information. See References.
For Solaris (sshd1M):
Refer to Sun Alert ID: 102962 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Apply the appropriate update for your system. See References.
References:
- Apple Mac OS X Web site: Apple - Apple - Mac OS X - Leopard Sneak Peek.
- Blue Coat Web site: SSH server on ProxySG may allow a remote attacker to cause a denial of service.
- BugTraq Mailing List, Tue Dec 05 2006 - 13:41:51 CST : HPSBUX02178 SSRT061267 rev.1 - HP-UX Secure Shell Remote Denial of Service (DoS).
- HPSBUX02178 SSRT061267: HP-UX Secure Shell Remote Denial of Service (DoS) .
- IBM Systems Support Web site: Support for HMC.
- Mac OS X 10.4.9 and Security Update 2007-003: About the security content of Mac OS X 10.4.9 and Security Update 2007-003.
- OpenSSH FTP Download Web page: FTP page.
- Red Hat Bugzilla Bug 207955: CVE-2006-4924 openssh DoS.
- Sun Alert ID: 102962: Security Vulnerability in the sshd(1M) Protocol Version 1 Implementation May Allow a Denial of Service to the Host.
- ASA-2006-216: openssh security update (RHSA-2006-0697)
- ASA-2006-262: HP-UX Secure Shell Remote Denial of Service (HPSBUX02178)
- ASA-2007-233: Security Vulnerability in the sshd(1M) Protocol Version 1 Implementation May Allow a Denial of Service to the Host (Sun 102962)
- BID-20216: OpenSSH Duplicated Block Remote Denial of Service Vulnerability
- CVE-2006-4924: 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.
- DSA-1189: openssh-krb5 -- several vulnerabilities
- DSA-1212: openssh -- Denial of service
- GLSA-200609-17: OpenSSH: Denial of Service
- MDKSA-2006:179: Updated openssh packages fix DoS vulnerabilities
- OpenPKG-SA-2006.022: OpenSSH
- OSVDB ID: 29152: OpenSSH Identical Block Packet DoS
- RHSA-2006-0697: openssh security update
- RHSA-2006-0698: openssh security update
- SA22091: OpenSSH Identical Blocks Denial of Service Vulnerability
- SA22362: Avaya Products OpenSSH Multiple Vulnerabilities
- SA23038: IBM HMC OpenSSH / OpenSSL Vulnerabilities
- SA23340: Avaya PDS HP-UX Secure Shell / OpenSSL Multiple Vulnerabilities
- SA23680: VMWare ESX Server Multiple Vulnerabilities
- SA24479: Mac OS X Security Update Fixes Multiple Vulnerabilities
- SA24799: IBM OpenSSH for AIX Two Vulnerabilities
- SA24805: Globus Toolkit GSI-OpenSSH Two Vulnerabilities
- SA25608: Sun Solaris sshd Identical Blocks Denial of Service Vulnerability
- SA34274: Blue Coat ProxySG SSH Server Denial of Service Vulnerability
- SECTRACK ID: 1016931: OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service
- SUSE-SA:2006:062: openssh security update
- SUSE-SR:2006:024: SUSE Security Summary Report
Platforms Affected:
- BlueCoat ProxySG 4.2
- BlueCoat ProxySG 4.3
- BlueCoat ProxySG 5.2
- Canonical Ubuntu 5.04
- Canonical Ubuntu 5.10
- Canonical Ubuntu 6.06 LTS
- Debian Debian Linux 3.1
- Gentoo Linux
- HP HP-UX B.11.00
- HP HP-UX B.11.11
- HP HP-UX B.11.23
- MandrakeSoft Mandrake Linux 2006 X86_64
- MandrakeSoft Mandrake Linux 2006
- MandrakeSoft Mandrake Linux 2007
- MandrakeSoft Mandrake Linux 2007 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0
- MandrakeSoft Mandrake Linux Corporate Server 4.0
- MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft Mandrake Multi Network Firewall 2.0
- Novell Linux Desktop 9
- Novell Linux POS 9
- Novell Open Enterprise Server
- Novell Open Enterprise Server
- Novell UnitedLinux 1.0
- OpenBSD OpenSSH 1.2
- OpenBSD OpenSSH 1.2.1
- OpenBSD OpenSSH 1.2.2
- OpenBSD OpenSSH 1.2.27
- OpenBSD OpenSSH 1.2.3
- OpenBSD OpenSSH 2.1
- OpenBSD OpenSSH 2.1.1
- OpenBSD OpenSSH 2.1.1p4
- OpenBSD OpenSSH 2.2
- OpenBSD OpenSSH 2.2.0p1
- OpenBSD OpenSSH 2.3
- OpenBSD OpenSSH 2.3.0p1
- OpenBSD OpenSSH 2.5
- OpenBSD OpenSSH 2.5.1
- OpenBSD OpenSSH 2.5.1p1
- OpenBSD OpenSSH 2.5.1p2
- OpenBSD OpenSSH 2.5.2
- OpenBSD OpenSSH 2.5.2p1
- OpenBSD OpenSSH 2.5.2p2
- OpenBSD OpenSSH 2.9
- OpenBSD OpenSSH 2.9.9
- OpenBSD OpenSSH 2.9.9p1
- OpenBSD OpenSSH 2.9.9p2
- OpenBSD OpenSSH 2.9p1
- OpenBSD OpenSSH 2.9p2
- OpenBSD OpenSSH 3.0
- OpenBSD OpenSSH 3.0.1
- OpenBSD OpenSSH 3.0.1p1
- OpenBSD OpenSSH 3.0.2
- OpenBSD OpenSSH 3.0.2p1
- OpenBSD OpenSSH 3.0p1
- OpenBSD OpenSSH 3.1
- OpenBSD OpenSSH 3.1p1
- OpenBSD OpenSSH 3.2
- OpenBSD OpenSSH 3.2.2
- OpenBSD OpenSSH 3.2.2p1
- OpenBSD OpenSSH 3.2.3
- OpenBSD OpenSSH 3.2.3p1
- OpenBSD OpenSSH 3.3
- OpenBSD OpenSSH 3.3p1
- OpenBSD OpenSSH 3.4
- OpenBSD OpenSSH 3.4p1
- OpenBSD OpenSSH 3.5
- OpenBSD OpenSSH 3.5p1
- OpenBSD OpenSSH 3.6
- OpenBSD OpenSSH 3.6.1
- OpenBSD OpenSSH 3.6.1p1
- OpenBSD OpenSSH 3.6.1p2
- OpenBSD OpenSSH 3.7
- OpenBSD OpenSSH 3.7.1
- OpenBSD OpenSSH 3.7.1p1
- OpenBSD OpenSSH 3.7.1p2
- OpenBSD OpenSSH 3.8
- OpenBSD OpenSSH 3.8.1
- OpenBSD OpenSSH 3.8.1p1
- OpenBSD OpenSSH 3.9
- OpenBSD OpenSSH 3.9.1
- OpenBSD OpenSSH 3.9.1p1
- OpenBSD OpenSSH 4.0
- OpenBSD OpenSSH 4.0p1
- OpenBSD OpenSSH 4.1p1
- OpenBSD OpenSSH 4.2
- OpenBSD OpenSSH 4.2p1
- OpenBSD OpenSSH 4.3
- OpenBSD OpenSSH 4.3p1
- OpenBSD OpenSSH 4.3p2
- OpenPKG OpenPKG 2-STABLE
- OpenPKG OpenPKG 2.5
- OpenPKG OpenPKG CURRENT
- RedHat Enterprise Linux 2.1 WS
- RedHat Enterprise Linux 2.1 AS
- RedHat Enterprise Linux 2.1 ES
- RedHat Enterprise Linux 3 ES
- RedHat Enterprise Linux 3 AS
- RedHat Enterprise Linux 3 WS
- RedHat Enterprise Linux 3 Desktop
- RedHat Enterprise Linux 4 ES
- RedHat Enterprise Linux 4 AS
- RedHat Enterprise Linux 4 WS
- RedHat Enterprise Linux 4 Desktop
- RedHat Linux Advanced Workstation 2.1 Itanium
- Sun Solaris 10 SPARC
- Sun Solaris 10 x86
- Sun Solaris 9 x86
- Sun Solaris 9 SPARC
- SuSE Linux Enterprise Server 8
- SUSE SuSE Linux 10.0
- SUSE SuSE Linux 10.1
- SUSE SuSE Linux 9.2
- SUSE SuSE Linux 9.3
- SuSE SuSE Linux Desktop 1.0
- SuSE SuSE Linux OpenExchange Server 4
- SuSE SuSE Linux Retail Solution 8
- SuSE SuSE Linux School Server
- SuSE SuSE Linux Standard Server 8
- SuSE SuSE SLED 10
- SuSE SuSE SLES 10
- SuSE SuSE SLES 9
- Turbolinux Turbolinux 10 Desktop
- Turbolinux Turbolinux 10 F...
- Turbolinux Turbolinux 10 Server
- Turbolinux Turbolinux 10 Server x64 Ed
- Turbolinux Turbolinux 7 Server
- Turbolinux Turbolinux 8 Server
- Turbolinux Turbolinux FUJI
- Turbolinux Turbolinux Home
- Turbolinux Turbolinux Multimedia
- Turbolinux Turbolinux Personal
- Turbolinux Turbolinux Appliance Server 1.0 Hosting Ed
- Turbolinux Turbolinux Appliance Server 1.0 Workgroup Ed
- Turbolinux Turbolinux Appliance Server 2.0
Reported:
Sep 25, 2006
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.