OpenSSH LoginGraceTime Remote Denial Of Service Vulnerability

BID:14963

Info

OpenSSH LoginGraceTime Remote Denial Of Service Vulnerability

Bugtraq ID: 14963
Class: Design Error
CVE: CVE-2004-2069
Remote: Yes
Local: No
Published: Jan 28 2004 12:00AM
Updated: Dec 15 2006 10:53PM
Credit: "Kumaresh" <[email protected]> disclosed this issue to the vendor.
Vulnerable: VMWare ESX Server 2.5.4
VMWare ESX Server 2.5.3
VMWare ESX Server 2.1.3
VMWare ESX Server 2.0.2
Redhat Linux 9.0 i386
Redhat Linux 7.3 i386
Redhat Fedora Core3
Redhat Fedora Core2
Redhat Fedora Core1
Redhat Enterprise Linux WS 3
Redhat Enterprise Linux ES 3
Redhat Enterprise Linux AS 3
Redhat Desktop 3.0
OpenSSH OpenSSH 3.7.1 p1
+ SCO Open Server 5.0.7
OpenSSH OpenSSH 3.7.1
OpenSSH OpenSSH 3.7 p1
OpenSSH OpenSSH 3.7 .1p2
OpenSSH OpenSSH 3.7
OpenSSH OpenSSH 3.6.1 p2
+ MandrakeSoft Corporate Server 2.1 x86_64
 + MandrakeSoft Corporate Server 2.1
+ MandrakeSoft Multi Network Firewall 2.0
+ Mandriva Linux Mandrake 9.1 ppc
 + Mandriva Linux Mandrake 9.1
+ Mandriva Linux Mandrake 9.0
+ Mandriva Linux Mandrake 8.2 ppc
 + Mandriva Linux Mandrake 8.2
+ Trustix Secure Linux 2.0
OpenSSH OpenSSH 3.6.1 p1
+ OpenPKG OpenPKG Current
 + Slackware Linux 9.0
+ Slackware Linux -current
 OpenSSH OpenSSH 3.6.1
+ Novell Netware 6.5
OpenSSH OpenSSH 3.5 p1
+ OpenPKG OpenPKG 1.2
+ Redhat Linux 9.0 i386
 + S.u.S.E. Linux Personal 8.2
+ Terra Soft Solutions Yellow Dog Linux 3.0
OpenSSH OpenSSH 3.5
OpenSSH OpenSSH 3.4 p1-1
OpenSSH OpenSSH 3.4 p1
+ Conectiva Linux Enterprise Edition 1.0
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + FreeBSD FreeBSD 5.0
+ FreeBSD FreeBSD 4.7 -RELEASE
 + FreeBSD FreeBSD 4.7
+ IBM AIX 5.1 L
 + IBM AIX 4.3.3
+ Immunix Immunix OS 7+
 + Redhat Linux 8.0
+ Slackware Linux 8.1
+ SuSE Linux 8.1
+ SuSE Linux 8.0
OpenSSH OpenSSH 3.4
OpenSSH OpenSSH 3.3 p1
OpenSSH OpenSSH 3.3
+ Openwall Openwall GNU/*/Linux (Owl)-current
 OpenSSH OpenSSH 3.2.3 p1
OpenSSH OpenSSH 3.2.2 p1
+ Apple Mac OS X 10.1.5
+ Apple Mac OS X 10.1.4
+ Apple Mac OS X 10.1.3
+ Apple Mac OS X 10.1.2
+ Apple Mac OS X 10.1.1
+ Apple Mac OS X 10.1
+ Apple Mac OS X 10.1
+ Apple Mac OS X 10.0.4
+ Apple Mac OS X 10.0.3
+ Apple Mac OS X 10.0.2
+ Apple Mac OS X 10.0.1
+ Apple Mac OS X 10.0
OpenSSH OpenSSH 3.2
+ OpenBSD OpenBSD 3.1
 OpenSSH OpenSSH 3.1 p1
+ Juniper NetScreen-IDP 10 3.0 r2
 + Juniper NetScreen-IDP 10 3.0 r1
 + Juniper NetScreen-IDP 10 3.0
+ Juniper NetScreen-IDP 100 3.0 r2
 + Juniper NetScreen-IDP 100 3.0 r1
 + Juniper NetScreen-IDP 100 3.0
+ Juniper NetScreen-IDP 1000 3.0 r2
 + Juniper NetScreen-IDP 1000 3.0 r1
 + Juniper NetScreen-IDP 1000 3.0
+ Juniper NetScreen-IDP 500 3.0 r2
 + Juniper NetScreen-IDP 500 3.0 r1
 + Juniper NetScreen-IDP 500 3.0
+ Redhat Enterprise Linux AS 2.1 IA64
 + Redhat Enterprise Linux AS 2.1
 + Redhat Enterprise Linux ES 2.1 IA64
 + Redhat Enterprise Linux ES 2.1
 + Redhat Enterprise Linux WS 2.1 IA64
 + Redhat Enterprise Linux WS 2.1
 + Redhat Linux 7.3
+ Redhat Linux 7.2
+ Redhat Linux 7.1
+ Redhat Linux for iSeries 7.1
+ Redhat Linux for pSeries 7.1
+ Slackware Linux 8.1
+ Sun Linux 5.0.7
+ Sun Solaris 9
 + Trustix Secure Linux 1.5
+ Trustix Secure Linux 1.2
+ Trustix Secure Linux 1.1
OpenSSH OpenSSH 3.1
OpenSSH OpenSSH 3.0.2 p1
+ Guardian Digital Engarde Secure Linux 1.0.1
+ HP VirtualVault 4.6
OpenSSH OpenSSH 3.0.2
- Debian Linux 3.0
+ FreeBSD FreeBSD 4.5 -STABLEpre2002-03-07
 + FreeBSD FreeBSD 4.5 -RELEASE
 + OpenPKG OpenPKG 1.0
+ Openwall Openwall GNU/*/Linux 0.1 -stable
 + SuSE Linux 8.0
OpenSSH OpenSSH 3.0.1 p1
OpenSSH OpenSSH 3.0.1
OpenSSH OpenSSH 3.0 p1
OpenSSH OpenSSH 3.0
OpenSSH OpenSSH 2.9.9
+ NetBSD NetBSD 1.5.2
+ SuSE Linux 7.3 sparc
 + SuSE Linux 7.3 ppc
 + SuSE Linux 7.3 i386
 + SuSE Linux 7.2
OpenSSH OpenSSH 2.9 p2
+ Caldera OpenLinux Server 3.1.1
+ Caldera OpenLinux Server 3.1
+ Caldera OpenLinux Workstation 3.1.1
+ Caldera OpenLinux Workstation 3.1
+ FreeBSD FreeBSD 4.4 -RELENG
 + HP Secure OS software for Linux 1.0
+ Immunix Immunix OS 7.0
+ MandrakeSoft Corporate Server 1.0.1
+ MandrakeSoft Single Network Firewall 7.2
+ Mandriva Linux Mandrake 8.1
+ Mandriva Linux Mandrake 8.0 ppc
 + Mandriva Linux Mandrake 8.0
+ Mandriva Linux Mandrake 7.2
+ Mandriva Linux Mandrake 7.1
+ Redhat Linux 7.2
+ Redhat Linux 7.1
+ Redhat Linux 7.0
+ Sun Cobalt RaQ 550
- SuSE Linux 7.3 sparc
 - SuSE Linux 7.3 ppc
 - SuSE Linux 7.3 i386
 - SuSE Linux 7.2 i386
 - SuSE Linux 7.1 x86
 - SuSE Linux 7.1 sparc
 - SuSE Linux 7.1 ppc
 - SuSE Linux 7.1 alpha
 OpenSSH OpenSSH 2.9 p1
- IBM AIX 4.3.3
- IBM AIX 4.3.2
- IBM AIX 4.3.1
- IBM AIX 4.3
OpenSSH OpenSSH 2.9
+ FreeBSD FreeBSD 4.6 -RELEASE
 + FreeBSD FreeBSD 4.6
+ FreeBSD FreeBSD 4.5 -RELEASE
 + FreeBSD FreeBSD 4.5
OpenSSH OpenSSH 2.5.2
- Caldera OpenUnix 8.0
- Caldera UnixWare 7.1.1
- Wirex Immunix OS 6.2
OpenSSH OpenSSH 2.5.1
+ NetBSD NetBSD 1.5.1
+ S.u.S.E. Linux Database Server 0
 + S.u.S.E. Linux Firewall on CD
+ S.u.S.E. SuSE eMail Server III
- SCO Open Server 5.0.6 a
 - SCO Open Server 5.0.6
- SCO Open Server 5.0.5
- SCO Open Server 5.0.4
- SCO Open Server 5.0.3
- SCO Open Server 5.0.2
- SCO Open Server 5.0.1
- SCO Open Server 5.0
+ SuSE Linux 7.3
+ SuSE Linux 7.2
+ SuSE Linux 7.1
+ SuSE SUSE Linux Enterprise Server 7
 OpenSSH OpenSSH 2.5
OpenSSH OpenSSH 2.3
- SuSE Linux 7.0 sparc
 - SuSE Linux 7.0 ppc
 - SuSE Linux 7.0 i386
 - SuSE Linux 7.0 alpha
 - SuSE Linux 6.4 ppc
 - SuSE Linux 6.4 i386
 - SuSE Linux 6.4 alpha
 Avaya Intuity LX
Avaya Integrated Management 2.1
Avaya Integrated Management
Avaya CVLAN
Not Vulnerable: VMWare ESX Server 2.5.4 Patch 1
VMWare ESX Server 2.5.3 Patch 4
VMWare ESX Server 2.1.3 Patch 2
VMWare ESX Server 2.0.2 Patch 2
OpenSSH OpenSSH 3.8 p1
+ S.u.S.E. Linux Personal 9.1 x86_64
 + S.u.S.E. Linux Personal 9.1

Discussion

OpenSSH LoginGraceTime Remote Denial Of Service Vulnerability

OpenSSH is susceptible to a remote denial-of-service vulnerability. This issue is due to a design flaw when servicing timeouts related to the 'LoginGraceTime' server-configuration directive.

Specifically, when 'LoginGraceTime' in conjunction with 'MaxStartups' and 'UsePrivilegeSeparation' are configured and enabled in the server, a condition may arise where the server refuses further remote connection attempts.

This issue may be exploited by remote attackers to deny SSH service to legitimate users.

Exploit / POC

OpenSSH LoginGraceTime Remote Denial Of Service Vulnerability

An exploit is not required.

Solution / Fix

OpenSSH LoginGraceTime Remote Denial Of Service Vulnerability

Solution:
Please see the referenced vendor advisories for more information and fixes.


OpenSSH OpenSSH 2.3

OpenSSH OpenSSH 2.5

OpenSSH OpenSSH 2.5.1

OpenSSH OpenSSH 2.5.2

OpenSSH OpenSSH 2.9 p2

OpenSSH OpenSSH 2.9

OpenSSH OpenSSH 2.9 p1

OpenSSH OpenSSH 2.9.9

OpenSSH OpenSSH 3.0

OpenSSH OpenSSH 3.0 p1

OpenSSH OpenSSH 3.0.1 p1

OpenSSH OpenSSH 3.0.1

OpenSSH OpenSSH 3.0.2

OpenSSH OpenSSH 3.0.2 p1

OpenSSH OpenSSH 3.1

OpenSSH OpenSSH 3.1 p1

OpenSSH OpenSSH 3.2

OpenSSH OpenSSH 3.2.2 p1

OpenSSH OpenSSH 3.2.3 p1

OpenSSH OpenSSH 3.3

OpenSSH OpenSSH 3.3 p1

OpenSSH OpenSSH 3.4

OpenSSH OpenSSH 3.4 p1

OpenSSH OpenSSH 3.4 p1-1

OpenSSH OpenSSH 3.5

OpenSSH OpenSSH 3.5 p1

OpenSSH OpenSSH 3.6.1 p1

OpenSSH OpenSSH 3.6.1 p2

OpenSSH OpenSSH 3.6.1

OpenSSH OpenSSH 3.7 p1

OpenSSH OpenSSH 3.7

OpenSSH OpenSSH 3.7 .1p2

OpenSSH OpenSSH 3.7.1

OpenSSH OpenSSH 3.7.1 p1

References

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