Oval Definition:oval:com.redhat.rhsa:def:20152140
Revision Date:2015-11-19Version:643
Title:RHSA-2015:2140: libssh2 security and bug fix update (Low)
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.
  • Family:unixClass:patch
    Status:Reference(s):CVE-2015-1782
    RHSA-2015:2140
    RHSA-2015:2140-00
    RHSA-2015:2140-07
    Platform(s):Red Hat Enterprise Linux 7
    Red Hat Enterprise Linux 7 (please do not use for >= RHEL-7.5)
    Product(s):
    Definition Synopsis
  • Red Hat Enterprise Linux must be installed
  • OR Package Information
  • Red Hat Enterprise Linux 7 is installed
  • AND
  • libssh2 is earlier than 0:1.4.3-10.el7
  • AND libssh2 is signed with Red Hat redhatrelease2 key
  • libssh2-devel is earlier than 0:1.4.3-10.el7
  • AND libssh2-devel is signed with Red Hat redhatrelease2 key
  • libssh2-docs is earlier than 0:1.4.3-10.el7
  • AND libssh2-docs is signed with Red Hat redhatrelease2 key
  • Definition Synopsis
  • Release Information
  • Red Hat Enterprise Linux 7 Client is installed
  • OR Red Hat Enterprise Linux 7 Server is installed
  • OR Red Hat Enterprise Linux 7 Workstation is installed
  • OR Red Hat Enterprise Linux 7 ComputeNode is installed
  • AND Package Information
  • libssh2-docs is earlier than 0:1.4.3-10.el7
  • AND libssh2-docs is signed with Red Hat redhatrelease2 key
  • OR
  • libssh2-devel is earlier than 0:1.4.3-10.el7
  • AND libssh2-devel is signed with Red Hat redhatrelease2 key
  • OR
  • libssh2 is earlier than 0:1.4.3-10.el7
  • AND libssh2 is signed with Red Hat redhatrelease2 key
  • BACK