[RHSA-2015:2140-07] Low: libssh2 security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Low: libssh2 security and bug fix update

Advisory ID: RHSA-2015:2140-07

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2140.html

Issue date: 2015-11-19

CVE Names: CVE-2015-1782

=====================================================================

 

1. Summary:

 

Updated libssh2 packages that fix one security issue and two bugs are now

available for Red Hat Enterprise Linux 7.

 

Red Hat Product Security has rated this update as having Low 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.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, noarch, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

 

3. Description:

 

The libssh2 packages provide a library that implements the SSH2 protocol.

 

A flaw was found in the way the kex_agree_methods() function of libssh2

performed a key exchange when negotiating a new SSH session. A

man-in-the-middle attacker could use a crafted SSH_MSG_KEXINIT packet to

crash a connecting libssh2 client. (CVE-2015-1782)

 

This update also fixes the following bugs:

 

* Previously, libssh2 did not correctly adjust the size of the receive

window while reading from an SSH channel. This caused downloads over

the secure copy (SCP) protocol to consume an excessive amount of memory.

A series of upstream patches has been applied on the libssh2 source code to

improve handling of the receive window size. Now, SCP downloads work as

expected. (BZ#1080459)

 

* Prior to this update, libssh2 did not properly initialize an internal

variable holding the SSH agent file descriptor, which caused the agent

destructor to close the standard input file descriptor by mistake.

An upstream patch has been applied on libssh2 sources to properly

initialize the internal variable. Now, libssh2 closes only the file

descriptors it owns. (BZ#1147717)

 

All libssh2 users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues. After installing these

updated packages, all running applications using libssh2 must be restarted

for this update to take effect.

 

4. 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

 

5. Bugs fixed (https://bugzilla.redhat.com/):

 

1147717 - free'ing a not-connected agent closes STDIN

1199511 - CVE-2015-1782 libssh2: Using SSH_MSG_KEXINIT data unbounded

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

libssh2-1.4.3-10.el7.src.rpm

 

x86_64:

libssh2-1.4.3-10.el7.i686.rpm

libssh2-1.4.3-10.el7.x86_64.rpm

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Client Optional (v. 7):

 

noarch:

libssh2-docs-1.4.3-10.el7.noarch.rpm

 

x86_64:

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

libssh2-devel-1.4.3-10.el7.i686.rpm

libssh2-devel-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode (v. 7):

 

Source:

libssh2-1.4.3-10.el7.src.rpm

 

x86_64:

libssh2-1.4.3-10.el7.i686.rpm

libssh2-1.4.3-10.el7.x86_64.rpm

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

 

noarch:

libssh2-docs-1.4.3-10.el7.noarch.rpm

 

x86_64:

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

libssh2-devel-1.4.3-10.el7.i686.rpm

libssh2-devel-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

libssh2-1.4.3-10.el7.src.rpm

 

aarch64:

libssh2-1.4.3-10.el7.aarch64.rpm

libssh2-debuginfo-1.4.3-10.el7.aarch64.rpm

 

ppc64:

libssh2-1.4.3-10.el7.ppc.rpm

libssh2-1.4.3-10.el7.ppc64.rpm

libssh2-debuginfo-1.4.3-10.el7.ppc.rpm

libssh2-debuginfo-1.4.3-10.el7.ppc64.rpm

 

ppc64le:

libssh2-1.4.3-10.el7.ppc64le.rpm

libssh2-debuginfo-1.4.3-10.el7.ppc64le.rpm

 

s390x:

libssh2-1.4.3-10.el7.s390.rpm

libssh2-1.4.3-10.el7.s390x.rpm

libssh2-debuginfo-1.4.3-10.el7.s390.rpm

libssh2-debuginfo-1.4.3-10.el7.s390x.rpm

 

x86_64:

libssh2-1.4.3-10.el7.i686.rpm

libssh2-1.4.3-10.el7.x86_64.rpm

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 7):

 

aarch64:

libssh2-debuginfo-1.4.3-10.el7.aarch64.rpm

libssh2-devel-1.4.3-10.el7.aarch64.rpm

 

noarch:

libssh2-docs-1.4.3-10.el7.noarch.rpm

 

ppc64:

libssh2-debuginfo-1.4.3-10.el7.ppc.rpm

libssh2-debuginfo-1.4.3-10.el7.ppc64.rpm

libssh2-devel-1.4.3-10.el7.ppc.rpm

libssh2-devel-1.4.3-10.el7.ppc64.rpm

 

ppc64le:

libssh2-debuginfo-1.4.3-10.el7.ppc64le.rpm

libssh2-devel-1.4.3-10.el7.ppc64le.rpm

 

s390x:

libssh2-debuginfo-1.4.3-10.el7.s390.rpm

libssh2-debuginfo-1.4.3-10.el7.s390x.rpm

libssh2-devel-1.4.3-10.el7.s390.rpm

libssh2-devel-1.4.3-10.el7.s390x.rpm

 

x86_64:

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

libssh2-devel-1.4.3-10.el7.i686.rpm

libssh2-devel-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

libssh2-1.4.3-10.el7.src.rpm

 

x86_64:

libssh2-1.4.3-10.el7.i686.rpm

libssh2-1.4.3-10.el7.x86_64.rpm

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 7):

 

noarch:

libssh2-docs-1.4.3-10.el7.noarch.rpm

 

x86_64:

libssh2-debuginfo-1.4.3-10.el7.i686.rpm

libssh2-debuginfo-1.4.3-10.el7.x86_64.rpm

libssh2-devel-1.4.3-10.el7.i686.rpm

libssh2-devel-1.4.3-10.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/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2015-1782

https://access.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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