Vulnerability identifier: #VU15436

Vulnerability risk: High

CVSSv3.1: 9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-16526

CWE-ID: CWE-119

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 execute arbitrary code on the target system.

The weakness exists due to the code doesn’t handle IP Options at all and simply removes them from the packet by using memmove and truncating the xDataLength field of the network buffer. A remote attacker can trigger memory corruption in usGenerateProtocolChecksum and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

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.