Issued:

2016-03-10

Updated:

2016-03-10

RHSA-2016:0428 - Moderate: libssh2 security update

Synopsis

Moderate: libssh2 security update

Type/Severity

Security Advisory Moderate

Topic

Updated libssh2 packages that fix one security issue are now available for Red Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.

Description

The libssh2 packages provide a library that implements the SSHv2 protocol.

A type confusion issue was found in the way libssh2 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-2016-0787)

Red Hat would like to thank Aris Adamantiadis for reporting this issue.

All libssh2 users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue. After installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.

Solution

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

For details on how to apply this update, refer to:

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

Affected Products

Updated Packages

• libssh2-devel-1.4.2-2.el6_7.1.ppc.rpm
• libssh2-docs-1.4.2-2.el6_7.1.ppc64.rpm
• libssh2-1.4.3-10.el7_2.1.ppc.rpm
• libssh2-1.4.3-10.el7_2.1.s390.rpm
• libssh2-devel-1.4.3-10.el7_2.1.i686.rpm
• libssh2-docs-1.4.3-10.el7_2.1.noarch.rpm
• libssh2-1.4.2-2.el6_7.1.ppc.rpm
• libssh2-1.4.2-2.el6_7.1.src.rpm
• libssh2-1.4.2-2.el6_7.1.i686.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.i686.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.s390x.rpm
• libssh2-docs-1.4.2-2.el6_7.1.s390x.rpm
• libssh2-devel-1.4.2-2.el6_7.1.x86_64.rpm
• libssh2-devel-1.4.2-2.el6_7.1.ppc64.rpm
• libssh2-devel-1.4.2-2.el6_7.1.s390.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.x86_64.rpm
• libssh2-devel-1.4.2-2.el6_7.1.i686.rpm
• libssh2-docs-1.4.2-2.el6_7.1.x86_64.rpm
• libssh2-devel-1.4.2-2.el6_7.1.s390x.rpm
• libssh2-1.4.2-2.el6_7.1.x86_64.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.ppc64.rpm
• libssh2-devel-1.4.3-10.el7_2.1.ppc64.rpm
• libssh2-1.4.2-2.el6_7.1.ppc64.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.s390.rpm
• libssh2-devel-1.4.3-10.el7_2.1.s390x.rpm
• libssh2-1.4.3-10.el7_2.1.x86_64.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.s390x.rpm
• libssh2-1.4.2-2.el6_7.1.s390x.rpm
• libssh2-docs-1.4.2-2.el6_7.1.i686.rpm
• libssh2-1.4.3-10.el7_2.1.i686.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.ppc64.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.s390.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.i686.rpm
• libssh2-1.4.3-10.el7_2.1.ppc64.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.x86_64.rpm
• libssh2-devel-1.4.3-10.el7_2.1.s390.rpm
• libssh2-devel-1.4.3-10.el7_2.1.ppc.rpm
• libssh2-1.4.3-10.el7_2.1.s390x.rpm
• libssh2-1.4.2-2.el6_7.1.s390.rpm
• libssh2-debuginfo-1.4.3-10.el7_2.1.ppc.rpm
• libssh2-devel-1.4.3-10.el7_2.1.x86_64.rpm
• libssh2-debuginfo-1.4.2-2.el6_7.1.ppc.rpm

Fixes

• This content is not included.BZ - 1306021

CVEs

• CVE-2016-0787

References

• https://access.redhat.com/security/updates/classification/#moderate

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.