Published:
23 September 2003
Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2003.0680 -- OpenSSH Security Advisory
Portable OpenSSH versions 3.7p1 and 3.7.1p1 contain multiple
vulnerabilities in the new PAM code
24 September 2003
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Portable OpenSSH versions 3.7p1 and 3.7.1p1
Publisher: OpenBSD
Impact: Root Compromise
Access Required: Remote
Comment: The necessary conditions (often enabled by default) are required
to be at risk:
o PAM Authentication enabled.
o Protocol version 1 enabled.
o ChallengeResponse enabled.
The OpenSSH advisory can be found at:
http://www.openssh.com/txt/sshpam.adv
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Portable OpenSSH 3.7.1p2 has just been released. It will be available
from the mirrors listed at http://www.openssh.com/portable.html shortly.
Please note that this is a release to address issues in the portable
version only. The items mentioned below do not affect the OpenBSD
version.
OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0
implementation and includes sftp client and server support.
We would like to thank the OpenSSH community for their continued
support to the project, especially those who contributed source and
bought T-shirts or posters.
We have a new design of T-shirt available, more info on
http://www.openbsd.org/tshirts.html#18
For international orders use http://https.openbsd.org/cgi-bin/order
and for European orders, use http://https.openbsd.org/cgi-bin/order.eu
Security Changes:Portable OpenSSH 3.7.1p2 has just been released. It will be available
from the mirrors listed at http://www.openssh.com/portable.html shortly.
Please note that this is a release to address issues in the portable
version only. The items mentioned below do not affect the OpenBSD
version.
OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0
implementation and includes sftp client and server support.
We would like to thank the OpenSSH community for their continued
support to the project, especially those who contributed source and
bought T-shirts or posters.
We have a new design of T-shirt available, more info on
http://www.openbsd.org/tshirts.html#18
For international orders use http://https.openbsd.org/cgi-bin/order
and for European orders, use http://https.openbsd.org/cgi-bin/order.eu
Security Changes:
=================
Portable OpenSSH version 3.7p1 and 3.7.1p1 contain multiple
vulnerabilities in the new PAM authentication code. At least one of
these bugs is remotely exploitable (under a non-standard
configuration, with privsep disabled).
OpenSSH 3.7.1p2 fixes these bugs. Please note that these bugs do not
exist in OpenBSD's releases of OpenSSH.
Changes since OpenSSH 3.7.1p1:
==============================
* This release disables PAM by default. To enable it, set "UsePAM yes" in
sshd_config. Due to complexity, inconsistencies in the specification and
differences between vendors' PAM implementations we recommend that PAM
be left disabled in sshd_config unless there is a need for its use.
Sites using only public key or simple password authentication usually
have little need to enable PAM support.
* This release now requires zlib 1.1.4 to build correctly. Previous
versions have security problems.
* Fix compilation for versions of OpenSSL before 0.9.6. Some cipher modes
are not supported for older OpenSSL versions.
* Fix compilation problems on systems with a missing or lacking inet_ntoa()
function.
* Workaround problems related to unimplemented or broken setresuid/setreuid
functions on several platforms.
* Fix compilation on older OpenBSD systems.
* Fix handling of password-less authentication (PermitEmptyPasswords=yes)
that has not worked since the 3.7p1 release.
Checksums:
==========
- - MD5 (openssh-3.7.1p2.tar.gz) = 61cf5b059938718308836d00f6764a94
Reporting Bugs:
===============
- - please read http://www.openssh.com/report.html
and http://bugzilla.mindrot.org/
OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt,
Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice.
=================
Portable OpenSSH version 3.7p1 and 3.7.1p1 contain multiple
vulnerabilities in the new PAM authentication code. At least one of
these bugs is remotely exploitable (under a non-standard
configuration, with privsep disabled).
OpenSSH 3.7.1p2 fixes these bugs. Please note that these bugs do not
exist in OpenBSD's releases of OpenSSH.
Changes since OpenSSH 3.7.1p1:
==============================
* This release disables PAM by default. To enable it, set "UsePAM yes" in
sshd_config. Due to complexity, inconsistencies in the specification and
differences between vendors' PAM implementations we recommend that PAM
be left disabled in sshd_config unless there is a need for its use.
Sites using only public key or simple password authentication usually
have little need to enable PAM support.
* This release now requires zlib 1.1.4 to build correctly. Previous
versions have security problems.
* Fix compilation for versions of OpenSSL before 0.9.6. Some cipher modes
are not supported for older OpenSSL versions.
* Fix compilation problems on systems with a missing or lacking inet_ntoa()
function.
* Workaround problems related to unimplemented or broken setresuid/setreuid
functions on several platforms.
* Fix compilation on older OpenBSD systems.
* Fix handling of password-less authentication (PermitEmptyPasswords=yes)
that has not worked since the 3.7p1 release.
Checksums:
==========
- - MD5 (openssh-3.7.1p2.tar.gz) = 61cf5b059938718308836d00f6764a94
Reporting Bugs:
===============
- - please read http://www.openssh.com/report.html
and http://bugzilla.mindrot.org/
OpenSSH is brought to you by Markus Friedl, Niels Provos, Theo de Raadt,
Kevin Steves, Damien Miller, Ben Lindstrom, Darren Tucker and Tim Rice.
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