libssh-0.9.4-2.el8

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

The following packages have been upgraded to a later upstream version: libssh (0.9.4).

Security Fix(es):

* libssh: denial of service when handling AES-CTR (or DES) ciphers (CVE-2020-1730)

* libssh: unsanitized location in scp could lead to unwanted command execution (CVE-2019-14889)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

CVE-2019-14889
A flaw was found with the libssh API function ssh_scp_new() in versions before 0.9.3 and before 0.8.8. When the libssh SCP client connects to a server, the scp command, which includes a user-provided path, is executed on the server-side. In case the library is used in a way where users can influence the third parameter of the function, it would become possible for an attacker to inject arbitrary commands, leading to a compromise of the remote target.
CVE-2020-1730
A flaw was found in libssh versions before 0.8.9 and before 0.9.4 in the way it handled AES-CTR (or DES ciphers if enabled) ciphers. The server or client could crash when the connection hasn't been fully initialized and the system tries to cleanup the ciphers when closing the connection. The biggest threat from this vulnerability is system availability.