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Red Hat: RHSA-2016-0566-01 Moderate: libssh Security Update

red hat
Calendar Grey April 1, 2016
Scroller Redhat
The new moderate libssh security update in Red Hat distributions significantly impacts SSH implementations, enhancing communication security and data protection
An update for libssh is now available for Red Hat Enterprise Linux 7 Extras

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing these updated packages, all running applications using libssh must be restarted for this update to take effect.

Summary

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.
Security Fix(es):
* A type confusion issue was found in the way libssh generated ephemeral secrets for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. This would cause an SSHv2 Diffie-Hellman handshake to use significantly less secure random parameters. (CVE-2016-0739)
Red Hat would like to thank Aris Adamantiadis for reporting this issue.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update issue SSH protocol libssh

References

https://access.redhat.com/security/cve/CVE-2016-0739 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux 7 Extras:
Source: libssh-0.7.1-2.el7.src.rpm
x86_64: libssh-0.7.1-2.el7.x86_64.rpm libssh-debuginfo-0.7.1-2.el7.x86_64.rpm libssh-devel-0.7.1-2.el7.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key


Advisory ID: RHSA-2016:0566-01
Product: Red Hat Enterprise Linux Extras
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0566.html
Issue date: 2016-03-31

Topic

An update for libssh is now available for Red Hat Enterprise Linux 7Extras.Red Hat Product Security has rated this update as having a security impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory moderate Red Hat update issue SSH protocol libssh

Relevant Releases Architectures

Red Hat Enterprise Linux 7 Extras - x86_64

Bugs Fixed

1305971 - CVE-2016-0739 libssh: bits/bytes confusion resulting in truncated Difffie-Hellman secret length

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