OpenSSH-portable Enabled PAM Delay Information Disclosure Vulnerability

BID:7467

Info

OpenSSH-portable Enabled PAM Delay Information Disclosure Vulnerability

Bugtraq ID: 7467
Class: Design Error
CVE: CVE-2003-0190
Remote: Yes
Local: No
Published: Apr 30 2003 12:00AM
Updated: Feb 22 2007 02:36AM
Credit: Discovery of this vulnerability has been credited to 'Marco Ivaldi <[email protected]>'.
Vulnerable: Ubuntu Ubuntu Linux 4.1 ppc
Ubuntu Ubuntu Linux 4.1 ia64
Ubuntu Ubuntu Linux 4.1 ia32
Turbolinux Turbolinux Workstation 8.0
Turbolinux Turbolinux Workstation 7.0
Turbolinux Turbolinux Workstation 6.0
Turbolinux Turbolinux Server 8.0
Turbolinux Turbolinux Server 7.0
Turbolinux Turbolinux Server 6.5
Turbolinux Turbolinux Server 6.1
Turbolinux Turbolinux Advanced Server 6.0
SuSE Linux Enterprise Server 9
S.u.S.E. Linux Personal 9.2 x86_64
S.u.S.E. Linux Personal 9.2
S.u.S.E. Linux Personal 9.1 x86_64
S.u.S.E. Linux Personal 9.1
OpenSSH OpenSSH 3.6.1 p1
+ OpenPKG OpenPKG Current
 + Slackware Linux 9.0
+ Slackware Linux -current
 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 3.4 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 3.1 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
Not Vulnerable: 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

Discussion

OpenSSH-portable Enabled PAM Delay Information Disclosure Vulnerability

OpenSSH-portable with PAM support enabled has been reported prone to an information-disclosure vulnerability under certain configurative circumstances.

By analyzing the response time during authentication, remote attackers may be able to determine whether or not the supplied username is valid.

This issue may be related to the issues described in BID 7342 and BID 7343. BID 11781 may also be pertinent; it describes an issue very similar to this one.

Exploit / POC

OpenSSH-portable Enabled PAM Delay Information Disclosure Vulnerability

The following proof-of-concept programs have been supplied:

Solution / Fix

OpenSSH-portable Enabled PAM Delay Information Disclosure Vulnerability

Solution:
UPDATE: Some fixes described in this BID may not be sufficient to completely guard against exploitation. See BID 11781 and the referenced Debian bug reports for more information.


OpenSSH OpenSSH 3.4 p1

OpenSSH OpenSSH 3.6.1 p1

Turbolinux Turbolinux Advanced Server 6.0

Turbolinux Turbolinux Workstation 6.0

Turbolinux Turbolinux Server 6.1

Turbolinux Turbolinux Server 6.5

Turbolinux Turbolinux Workstation 7.0

Turbolinux Turbolinux Server 7.0

References

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