Synopsis:          Low: libssh2 security and bug fix update
Advisory ID:       SLSA-2015:2140-7
Issue Date:        2015-11-19
CVE Numbers:       CVE-2015-1782
--

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.
--

SL7
  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
    libssh2-devel-1.4.3-10.el7.i686.rpm
    libssh2-devel-1.4.3-10.el7.x86_64.rpm
  noarch
    libssh2-docs-1.4.3-10.el7.noarch.rpm

- Scientific Linux Development Team