Vulnerability identifier: #VU15438

Vulnerability risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-16523

CWE-ID: CWE-369

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeRTOS
Operating systems & Components / Operating system
OpenRTOS
Operating systems & Components / Operating system
SafeRTOS
Operating systems & Components / Operating system

Vendor: Amazon Web Services
WITTENSTEIN high integrity systems

Description
The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists due to the function prvCheckOptions checks the TCP options supplied within an Rx TCP packet. A remote attacker can trigger a divide by zero error in prvCheckOptions within the TCP/IP component and cause the system to crash.

Mitigation
Update the affected software to version 1.3.2.

Vulnerable software versions

FreeRTOS: 1.00 - 10.0.1

OpenRTOS: All versions

SafeRTOS: All versions

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External links
http://blog.zimperium.com/freertos-tcpip-stack-vulnerabilities-put-wide-range-devices-risk-compromi...

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.