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 CPU resources, resulting in a denial of service.
Platforms Affected:
- 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 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 4.0
- 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 ES
- RedHat, Enterprise Linux 2.1 AS
- RedHat, Enterprise Linux 2.1 WS
- RedHat, Enterprise Linux 3 ES
- RedHat, Enterprise Linux 3 WS
- RedHat, Enterprise Linux 3 AS
- RedHat, Enterprise Linux 3 Desktop
- RedHat, Enterprise Linux 4 AS
- RedHat, Enterprise Linux 4 Desktop
- RedHat, Enterprise Linux 4 ES
- RedHat, Enterprise Linux 4 WS
- RedHat, Linux Advanced Workstation 2.1 Itanium
- Sun, Solaris 10 x86
- Sun, Solaris 10 SPARC
- Sun, Solaris 9 x86
- Sun, Solaris 9 SPARC
- 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 Enterprise Server 8.0
- 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
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.
Consequences:
Denial of Service
References:
- Apple Mac OS X Web site, Apple - Apple - Mac OS X - Leopard Sneak Peek at http://www.apple.com/macosx/leopard/.
- BugTraq Mailing List, Tue Dec 05 2006 - 13:41:51 CST , HPSBUX02178 SSRT061267 rev.1 - HP-UX Secure Shell Remote Denial of Service (DoS) at http://archives.neohapsis.com/archives/bugtraq/2006-12/0091.html.
- HPSBUX02178 SSRT061267, HP-UX Secure Shell Remote Denial of Service (DoS) at http://www2.itrc.hp.com/service/cki/docDisplay.do?docId=c00815112.
- IBM Systems Support Web site, Support for HMC at https://www14.software.ibm.com/webapp/set2/sas/f/hmc/power5/install/v61.Readme.html#MH01110.
- 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 at http://docs.info.apple.com/article.html?artnum=305214.
- OpenSSH FTP Download Web page, FTP page at ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/.
- Red Hat Bugzilla Bug 207955, CVE-2006-4924 openssh DoS at https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207955.
- Sun Alert ID: 102962, Security Vulnerability in the sshd(1M) Protocol Version 1 Implementation May Allow a Denial of Service to the Host at http://sunsolve.sun.com/search/document.do?assetkey=1-26-102962-1.
- 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
- 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
Reported:
Sep 25, 2006
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