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Fedora: 2015-11067 Critical: Openssh XSECURITY Issues and Agent Weakness

fedora
Calendar Grey July 10, 2015
Dist Fedora Esm H88
Essential OpenSSH patch for Fedora 21 resolves XSECURITY vulnerabilities and deficiencies in agent locking mechanisms. Discover further insights here.
This update brings security fix for two announced vulnerabilities

Summary

SSH (Secure SHell) is a program for logging into and executing

commands on a remote machine. SSH is intended to replace rlogin and

rsh, and to provide secure encrypted communications between two

untrusted hosts over an insecure network. X11 connections and

arbitrary TCP/IP ports can also be forwarded over the secure channel.

OpenSSH is OpenBSD's version of the last free version of SSH, bringing

it up to date in terms of security and features.

This package includes the core files necessary for both the OpenSSH

client and server. To make this package useful, you should also

install openssh-clients, openssh-server, or both.

Update Information:

This update brings security fix for two announced vulnerabilities. Namely XSECURITY restrictions bypass under certain conditions AND weakness of agent locking (ssh-add -x) to password guessing (more info in related bugs). For more information see related bugs.

Topics%20covered

Topics Covered

security advisory update critical Fedora openssh XSECURITY agent locking

Change Log

* Wed Jul 1 2015 Jakub Jelen 6.6.1p1-13 + 0.9.3.3 - Security fixes released with openssh-6.9 - XSECURITY restrictions bypass under certain conditions in ssh(1) (#1238231) - weakness of agent locking (ssh-add -x) to password guessing (#1238238) - ssh-copy-id: tcsh doesnt work with multiline strings so we will make it uggly one-line - Fix auditing when using combination of ForceCommand and PTY (#1203900) - fix direction in CRYPTO_SESSION audit message * Mon Mar 30 2015 Jakub Jelen 6.6.1p1-12 + 0.9.3-3 - Fix ssh-copy-id on non-sh shells (#1045191) - Add tmpfiles.d entris (#1196807) - Solve issue with ssh-copy-id and keys without trailing newline (#1093168) - Remove unused patch * Thu Jan 15 2015 Jakub Jelen 6.6.1p1-11.1 + 0.9.3-3 - error message if scp when directory doesn't exist (#1142223) - parsing configuration file values (#1130733) - documentation in service and socket files for systemd (#1181593) - updated ldap patch (#981058) - fixed vendor-patchlevel - add new option GSSAPIEnablek5users and disable using ~/.k5users by default CVE-2014-9278 (#1170745) * Fri Dec 19 2014 Petr Lautrbach 6.6.1p1-10 + 0.9.3-3 - log via monitor in chroots without /dev/log * Wed Dec 3 2014 Petr Lautrbach 6.6.1p1-9 + 0.9.3-3 - the .local domain example should be in ssh_config, not in sshd_config - use different values for DH for Cisco servers (#1026430)

References


[ 1 ] Bug #1238238 - openssh: weakness of agent locking (ssh-add -x) to password guessing https://bugzilla.redhat.com/show_bug.cgi?id=1238238 [ 2 ] Bug #1238231 - CVE-2015-5352 openssh: XSECURITY restrictions bypass under certain conditions in ssh(1) https://bugzilla.redhat.com/show_bug.cgi?id=1238231

Update Instructions

This update can be installed with the "yum" update program. Use su -c 'yum update openssh' at the command line. For more information, refer to "Managing Software with yum", available at .

Severity
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Name: openssh
Product: Fedora 21
Version: 6.6.1p1
Release: 13.fc21
URL: https://www.openssh.org/portable.html
Summary: An open source implementation of SSH protocol versions 1 and 2

Topics%20covered

Topics Covered

security advisory update critical Fedora openssh XSECURITY agent locking

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