VxWorks 6.9.x < / 7 (SR540) / 7 (SR610) Multiple Vulnerabilities (URGENT/11)

critical Nessus Network Monitor Plugin ID 701083
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The remote host is running VxWorks embedded Operating System that is affected by multiple attack vectors.


The version of VxWorks installed on the remote host is 6.9.x, prior to, or 7 (SR540), or 7 (SR540), and is affected by multiple vulnerabilities :

- A specially crafted IPv4 packet, containing invalid encoded SSRR/LSRR options, may cause call-stack overflow. No specific services beyond IPv4 protocol support is required. (CVE-2019-12256)
- A specially crafted packet containing illegal TCP-options can result in the victim not just dropping the TCP-segment but also drop the TCP-session. (CVE-2019-12258)
- This vulnerability require that the TCP/IP-stack is assigned a multicast address the API intended for assigning unicast addresses or something with the same logical flaw is a prerequisite. (CVE-2019-12259)
- A series of specially crafted TCP-segments where the last step is a TCP-segment with the URG-flag set may cause overflow of the buffer passed to recv(), recvfrom() or 'recvmsg()' socket routines. (CVE-2019-12260)
- A specially crafted response to the connection attempt, where also the FIN- and URG-flags are set is sent as a response. This may put the victim into an inconsistent state, which make it possible to send yet another segment that trigger a buffer overflow. (CVE-2019-12261)
- The RARP reception handler verifies that the packet is well formed, but fails to verify that the node has an ongoing RARP-transaction matching the received packet. (CVE-2019-12262)
- A series of segments with and without the URG-flag set must arrive with a very specific timing while an application on the victim is receiving from the session. The victim must be using a SMP-kernel and two or more CPU-cores alternatively an uni-processor kernel where the receiving task and the network task executes at different priorities. (CVE-2019-12263)
- The VxWorks DHCP client fails to properly validate that the offered IP-address in a DHCP renewal or offer response contains a valid unicast address. An attacker may assign multicast or broadcast addresses to the victim. (CVE-2019-12264)
- An attacker can create specially crafted and fragmented IGMPv3 query report, which may result in the victim transmitting undefined buffer content. (CVE-2019-12265)


Update to VxWorks version or later. If 6.9.x cannot be obtained, VxWorks 7 SR620 has also been patched for these vulnerabilities.

See Also




Plugin Details

Severity: Critical

ID: 701083

Family: IoT

Published: 7/29/2019

Updated: 7/29/2019

Dependencies: 5622

Risk Information


Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Patch Publication Date: 7/19/2019

Vulnerability Publication Date: 7/19/2019

Reference Information

CVE: CVE-2019-12256, CVE-2019-12258, CVE-2019-12259, CVE-2019-12260, CVE-2019-12261, CVE-2019-12262, CVE-2019-12263, CVE-2019-12264, CVE-2019-12265