OpenSSH-Portable GSSAPI Authentication Abort Information Disclosure Weakness

BID:20245

Info

OpenSSH-Portable GSSAPI Authentication Abort Information Disclosure Weakness

Bugtraq ID: 20245
Class: Unknown
CVE: CVE-2006-5052
Remote: Yes
Local: No
Published: Sep 27 2006 12:00AM
Updated: Jan 04 2008 05:10PM
Credit: The vendor disclosed this issue.
Vulnerable: Trustix Secure Linux 3.0
Trustix Secure Linux 2.2
Trustix Secure Enterprise Linux 2.0
SuSE SUSE Linux Enterprise Server 8
+ Linux kernel 2.4.21
+ Linux kernel 2.4.19
SuSE SUSE Linux Enterprise Server 10
SuSE Suse Linux Enterprise Desktop 10
SuSE Linux Enterprise Server 9
SuSE Linux Desktop 1.0
Slackware Linux 10.2
Slackware Linux 10.1
Slackware Linux 10.0
Slackware Linux 9.1
Slackware Linux 9.0
Slackware Linux 8.1
Slackware Linux -current
S.u.S.E. UnitedLinux 1.0
S.u.S.E. SuSE Linux Openexchange Server 4.0
S.u.S.E. Open-Enterprise-Server 0
S.u.S.E. Novell Linux POS 9
S.u.S.E. Novell Linux Desktop 1.0
S.u.S.E. Novell Linux Desktop 9
S.u.S.E. Linux Professional 10.0 OSS
S.u.S.E. Linux Professional 10.0
S.u.S.E. Linux Professional 9.3 x86_64
S.u.S.E. Linux Professional 9.3
S.u.S.E. Linux Professional 9.2 x86_64
S.u.S.E. Linux Professional 9.2
S.u.S.E. Linux Professional 10.1
S.u.S.E. Linux Personal 10.0 OSS
S.u.S.E. Linux Personal 9.3 x86_64
S.u.S.E. Linux Personal 9.3
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
S.u.S.E. Linux Personal 10.1
rPath rPath Linux 1
Redhat Enterprise Linux WS 4
Redhat Enterprise Linux ES 4
Redhat Enterprise Linux Desktop 5 client
Redhat Enterprise Linux AS 4
Redhat Enterprise Linux 5 Server
Redhat Desktop 4.0
OpenSSH OpenSSH 4.2p1
OpenPKG OpenPKG 2.5
OpenPKG OpenPKG 2.4
OpenPKG OpenPKG 2.3
OpenPKG OpenPKG 2.2
OpenPKG OpenPKG 2.1
OpenPKG OpenPKG 2.0
OpenPKG OpenPKG Current
OpenBSD Portable OpenSSH 4.3p2
OpenBSD Portable OpenSSH 4.3p1
OpenBSD Portable OpenSSH 4.2p1
OpenBSD Portable OpenSSH 4.1p1
OpenBSD Portable OpenSSH 4.0p1
Gentoo Linux
Avaya SES 3.1.2
Avaya SES 3.1.1
Avaya SES 4.0
Avaya Messaging Storage Server 3.1
Avaya Message Networking MN 3.1
Avaya Intuity AUDIX LX 2.0
Avaya Communication Manager 4.0
Avaya Communication Manager 3.1
+ Avaya Communication Manager Server DEFINITY Server SI/CS
+ Avaya Communication Manager Server S8100
+ Avaya Communication Manager Server S8300
+ Avaya Communication Manager Server S8500
+ Avaya Communication Manager Server S8700
Avaya Communication Manager 3.0
+ Avaya Communication Manager Server DEFINITY Server SI/CS
+ Avaya Communication Manager Server S8100
+ Avaya Communication Manager Server S8100
+ Avaya Communication Manager Server S8300
+ Avaya Communication Manager Server S8300
+ Avaya Communication Manager Server S8500
+ Avaya Communication Manager Server S8500
+ Avaya Communication Manager Server S8700
+ Avaya Communication Manager Server S8700
Avaya AES 4.0
Apple Mac OS X Server 10.4.8
Apple Mac OS X Server 10.4.7
Apple Mac OS X Server 10.4.6
Apple Mac OS X Server 10.4.5
Apple Mac OS X Server 10.4.4
Apple Mac OS X Server 10.4.3
Apple Mac OS X Server 10.4.2
Apple Mac OS X Server 10.4.1
Apple Mac OS X Server 10.4
Apple Mac OS X Server 10.3.9
Apple Mac OS X 10.4.8
Apple Mac OS X 10.4.7
Apple Mac OS X 10.4.6
Apple Mac OS X 10.4.5
Apple Mac OS X 10.4.4
Apple Mac OS X 10.4.3
Apple Mac OS X 10.4.2
Apple Mac OS X 10.4.1
Apple Mac OS X 10.4
Apple Mac OS X 10.3.9
Not Vulnerable: OpenBSD Portable OpenSSH 4.4p1
Apple Mac OS X Server 10.4.9
Apple Mac OS X 10.4.9

Discussion

OpenSSH-Portable GSSAPI Authentication Abort Information Disclosure Weakness

OpenSSH-Portable is prone to an information-disclosure weakness. The issue stems from a GSSAPI authentication abort.

Reportedly, attackers may leverage a GSSAPI authentication abort to determine the presence and validity of usernames on unspecified platforms.

This issue occurs when OpenSSH-Portable is configured to accept GSSAPI authentication.

OpenSSH-Portable 4.3p1 and prior versions exhibit this weakness.

Exploit / POC

OpenSSH-Portable GSSAPI Authentication Abort Information Disclosure Weakness

To exploit this weakness, attackers would likely use a modified OpenSSH client or perhaps readily available network utilities that replay packets.

Solution / Fix

OpenSSH-Portable GSSAPI Authentication Abort Information Disclosure Weakness

Solution:
The vendor has released updated versions of the software that address this issue.

Please see the referenced advisories for more information.


OpenSSH OpenSSH 4.2p1

OpenBSD Portable OpenSSH 4.3p1

Apple Mac OS X Server 10.3.9

Apple Mac OS X 10.3.9

Apple Mac OS X 10.4

Apple Mac OS X Server 10.4

Apple Mac OS X Server 10.4.1

Apple Mac OS X 10.4.1

Apple Mac OS X 10.4.2

Apple Mac OS X Server 10.4.3

Apple Mac OS X 10.4.3

Apple Mac OS X Server 10.4.4

Apple Mac OS X 10.4.4

Apple Mac OS X Server 10.4.5

Apple Mac OS X 10.4.5

Apple Mac OS X Server 10.4.6

Apple Mac OS X 10.4.6

Apple Mac OS X Server 10.4.7

Apple Mac OS X 10.4.7

Apple Mac OS X 10.4.8

Apple Mac OS X Server 10.4.8

References

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