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Security Advisory openssh security update

Advisory: RHSA-2006:0698-8
Type: Security Advisory
Severity: Important
Issued on: 2006-09-28
Last updated on: 2006-09-28
Affected Products: Red Hat Enterprise Linux AS (v. 2.1)
Red Hat Enterprise Linux ES (v. 2.1)
Red Hat Enterprise Linux WS (v. 2.1)
Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor
CVEs (cve.mitre.org): CVE-2003-0386
CVE-2006-0225
CVE-2006-4924
CVE-2006-5051

Details

Updated openssh packages that fix several security issues in sshd are now
available for Red Hat Enterprise Linux 2.1.

This update has been rated as having important security impact by the Red Hat
Security Response Team.

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. This
package includes the core files necessary for both the OpenSSH client and
server.

Mark Dowd discovered a signal handler race condition in the OpenSSH sshd
server. A remote attacker could possibly leverage this flaw to cause a
denial of service (crash). (CVE-2006-5051) The OpenSSH project believes the
likelihood of successful exploitation leading to arbitrary code execution
appears remote. However, the Red Hat Security Response Team have not yet
been able to verify this claim due to lack of upstream vulnerability
information. We are therefore including a fix for this flaw and have rated
it important security severity in the event our continued investigation
finds this issue to be exploitable.

Tavis Ormandy of the Google Security Team discovered a denial of service
bug in the OpenSSH sshd server. A remote attacker can send a specially
crafted SSH-1 request to the server causing sshd to consume a large
quantity of CPU resources. (CVE-2006-4924)

An arbitrary command execution flaw was discovered in the way scp copies
files locally. It is possible for a local attacker to create a file with a
carefully crafted name that could execute arbitrary commands as the user
running scp to copy files locally. (CVE-2006-0225)

The SSH daemon, when restricting host access by numeric IP addresses and
with VerifyReverseMapping disabled, allows remote attackers to bypass
"from=" and "user@host" address restrictions by connecting to a host from a
system whose reverse DNS hostname contains the numeric IP address.
(CVE-2003-0386)

All users of openssh should upgrade to these updated packages, which
contain backported patches that resolve these issues.


Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via Red Hat Network. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

Updated packages

Red Hat Enterprise Linux AS (v. 2.1)

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/SRPMS/openssh-3.1p1-21.src.rpm
Missing file
    MD5: a62d73d72a85cd4f505498620728e2ee
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/i386/openssh-3.1p1-21.i386.rpm
Missing file
    MD5: c504545a33a373c674f2dd2f2b0d16ef
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass/3.1p1-21/i386/openssh-askpass-3.1p1-21.i386.rpm
Missing file
    MD5: 9c6738a9b658806ab56f972dbe665933
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass-gnome/3.1p1-21/i386/openssh-askpass-gnome-3.1p1-21.i386.rpm
Missing file
    MD5: fd049bc8f612922a0661bd3e435c7c31
ftp://updates.redhat.com/rhn/repository/NULL/openssh-clients/3.1p1-21/i386/openssh-clients-3.1p1-21.i386.rpm
Missing file
    MD5: e4e081840bcaad593b49f0bebdebaab1
ftp://updates.redhat.com/rhn/repository/NULL/openssh-server/3.1p1-21/i386/openssh-server-3.1p1-21.i386.rpm
Missing file
    MD5: 33963303ac6d5e6bd0085c24cce7a442
 
IA-64:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/ia64/openssh-3.1p1-21.ia64.rpm
Missing file
    MD5: b276261699adcb17f416e772b4e9be0c
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass/3.1p1-21/ia64/openssh-askpass-3.1p1-21.ia64.rpm
Missing file
    MD5: 0799c0755a5ab6c535d30b8eae4c2f44
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass-gnome/3.1p1-21/ia64/openssh-askpass-gnome-3.1p1-21.ia64.rpm
Missing file
    MD5: 0b784feaf17e7f82a5370151b804ab1d
ftp://updates.redhat.com/rhn/repository/NULL/openssh-clients/3.1p1-21/ia64/openssh-clients-3.1p1-21.ia64.rpm
Missing file
    MD5: 5ee6cbd8bfc153ff3f588e11c825c20c
ftp://updates.redhat.com/rhn/repository/NULL/openssh-server/3.1p1-21/ia64/openssh-server-3.1p1-21.ia64.rpm
Missing file
    MD5: e1852f54796b77c0a01bcb2f1557868d
 
Red Hat Enterprise Linux ES (v. 2.1)

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/SRPMS/openssh-3.1p1-21.src.rpm
Missing file
    MD5: a62d73d72a85cd4f505498620728e2ee
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/i386/openssh-3.1p1-21.i386.rpm
Missing file
    MD5: c504545a33a373c674f2dd2f2b0d16ef
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass/3.1p1-21/i386/openssh-askpass-3.1p1-21.i386.rpm
Missing file
    MD5: 9c6738a9b658806ab56f972dbe665933
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass-gnome/3.1p1-21/i386/openssh-askpass-gnome-3.1p1-21.i386.rpm
Missing file
    MD5: fd049bc8f612922a0661bd3e435c7c31
ftp://updates.redhat.com/rhn/repository/NULL/openssh-clients/3.1p1-21/i386/openssh-clients-3.1p1-21.i386.rpm
Missing file
    MD5: e4e081840bcaad593b49f0bebdebaab1
ftp://updates.redhat.com/rhn/repository/NULL/openssh-server/3.1p1-21/i386/openssh-server-3.1p1-21.i386.rpm
Missing file
    MD5: 33963303ac6d5e6bd0085c24cce7a442
 
Red Hat Enterprise Linux WS (v. 2.1)

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/SRPMS/openssh-3.1p1-21.src.rpm
Missing file
    MD5: a62d73d72a85cd4f505498620728e2ee
 
IA-32:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/i386/openssh-3.1p1-21.i386.rpm
Missing file
    MD5: c504545a33a373c674f2dd2f2b0d16ef
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass/3.1p1-21/i386/openssh-askpass-3.1p1-21.i386.rpm
Missing file
    MD5: 9c6738a9b658806ab56f972dbe665933
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass-gnome/3.1p1-21/i386/openssh-askpass-gnome-3.1p1-21.i386.rpm
Missing file
    MD5: fd049bc8f612922a0661bd3e435c7c31
ftp://updates.redhat.com/rhn/repository/NULL/openssh-clients/3.1p1-21/i386/openssh-clients-3.1p1-21.i386.rpm
Missing file
    MD5: e4e081840bcaad593b49f0bebdebaab1
ftp://updates.redhat.com/rhn/repository/NULL/openssh-server/3.1p1-21/i386/openssh-server-3.1p1-21.i386.rpm
Missing file
    MD5: 33963303ac6d5e6bd0085c24cce7a442
 
Red Hat Linux Advanced Workstation 2.1 for the Itanium Processor

SRPMS:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/SRPMS/openssh-3.1p1-21.src.rpm
Missing file
    MD5: a62d73d72a85cd4f505498620728e2ee
 
IA-64:
ftp://updates.redhat.com/rhn/repository/NULL/openssh/3.1p1-21/ia64/openssh-3.1p1-21.ia64.rpm
Missing file
    MD5: b276261699adcb17f416e772b4e9be0c
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass/3.1p1-21/ia64/openssh-askpass-3.1p1-21.ia64.rpm
Missing file
    MD5: 0799c0755a5ab6c535d30b8eae4c2f44
ftp://updates.redhat.com/rhn/repository/NULL/openssh-askpass-gnome/3.1p1-21/ia64/openssh-askpass-gnome-3.1p1-21.ia64.rpm
Missing file
    MD5: 0b784feaf17e7f82a5370151b804ab1d
ftp://updates.redhat.com/rhn/repository/NULL/openssh-clients/3.1p1-21/ia64/openssh-clients-3.1p1-21.ia64.rpm
Missing file
    MD5: 5ee6cbd8bfc153ff3f588e11c825c20c
ftp://updates.redhat.com/rhn/repository/NULL/openssh-server/3.1p1-21/ia64/openssh-server-3.1p1-21.ia64.rpm
Missing file
    MD5: e1852f54796b77c0a01bcb2f1557868d
 

Bugs fixed (see bugzilla for more information)

174026 - CVE-2006-0225 local to local copy uses shell expansion twice
208248 - CVE-2003-0386 host based access bypass
208298 - CVE-2006-4924 openssh DoS
208430 - CVE-2006-5051 unsafe GSSAPI signal handler


References



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