Andreas Schneider reported that libssh2, a SSH2 client-side library, passes the number of bytes to a function that expects number of bits during the SSHv2 handshake when libssh2 is to get a suitable value for group order in the Diffie-Hellman negotiation. This weakens significantly the handshake security, potentially allowing an eavesdropper with enough resources to decrypt or intercept SSH sessions. For the oldstable distribution (wheezy), this problem has been fixed in version 1.4.2-1.1+deb7u2. For the stable distribution (jessie), this problem has been fixed in version 1.4.3-4.1+deb8u1. We recommend that you upgrade your libssh2 packages.
Andreas Schneider reported that libssh4, a SSH2 client-side library,
passes the number of bytes to a function that expects number of bits
during the SSHv2 handshake when libssh4 is to get a suitable value for
group order
in the Diffie-Hellman negotiation. This weakens
significantly the handshake security, potentially allowing an
eavesdropper with enough resources to decrypt or intercept SSH sessions.
For the oldstable distribution (wheezy), this problem has been fixed in version 1.4.2-1.1+deb7u2.
For the stable distribution (jessie), this problem has been fixed in version 1.4.3-4.1+deb8u1.
We recommend that you upgrade your libssh4 packages.
Vulmon