Scientific Linux Security Update : libssh2 on SL7.x x86_64

This script is Copyright (C) 2015 Tenable Network Security, Inc.

Synopsis :

The remote Scientific Linux host is missing one or more security

Description :

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.

- 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.

After installing these updated packages, all running applications
using libssh2 must be restarted for this update to take effect.

See also :

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.8

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 87561 ()

Bugtraq ID:

CVE ID: CVE-2015-1782

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